./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec4_product13.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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product13.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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 a4d75af8ac92d9f5b92cf5fbd6315f6202b8108aa1e42fc32d65f286c89fdf2f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:54:20,721 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:54:20,723 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:54:20,779 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:54:20,780 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:54:20,786 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:54:20,787 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:54:20,791 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:54:20,794 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:54:20,802 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:54:20,803 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:54:20,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:54:20,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:54:20,808 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:54:20,810 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:54:20,817 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:54:20,818 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:54:20,819 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:54:20,821 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:54:20,824 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:54:20,826 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:54:20,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:54:20,835 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:54:20,836 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:54:20,847 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:54:20,847 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:54:20,848 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:54:20,850 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:54:20,850 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:54:20,852 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:54:20,852 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:54:20,853 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:54:20,855 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:54:20,856 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:54:20,858 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:54:20,858 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:54:20,859 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:54:20,859 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:54:20,859 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:54:20,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:54:20,861 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:54:20,862 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:54:20,911 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:54:20,912 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:54:20,913 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:54:20,913 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:54:20,914 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:54:20,915 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:54:20,915 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:54:20,915 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:54:20,915 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:54:20,916 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:54:20,917 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:54:20,917 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:54:20,917 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:54:20,918 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:54:20,918 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:54:20,919 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:54:20,919 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:54:20,919 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:54:20,919 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:54:20,920 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:54:20,920 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:54:20,920 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:54:20,920 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:54:20,920 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:54:20,921 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:54:20,921 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:54:20,921 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:54:20,921 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:54:20,922 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:54:20,922 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:54:20,922 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:54:20,922 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:54:20,923 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:54:20,923 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:54:20,923 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:54:20,924 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:54:20,924 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:54:20,924 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:54:20,924 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:54:20,924 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a4d75af8ac92d9f5b92cf5fbd6315f6202b8108aa1e42fc32d65f286c89fdf2f [2021-11-07 00:54:21,226 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:54:21,249 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:54:21,251 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:54:21,253 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:54:21,253 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:54:21,254 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product13.cil.c [2021-11-07 00:54:21,328 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/a661028e8/9d94be4f63d24d6f8d17532604cd24fa/FLAGf9a270151 [2021-11-07 00:54:21,951 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:54:21,952 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/sv-benchmarks/c/product-lines/email_spec4_product13.cil.c [2021-11-07 00:54:21,980 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/a661028e8/9d94be4f63d24d6f8d17532604cd24fa/FLAGf9a270151 [2021-11-07 00:54:22,160 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/a661028e8/9d94be4f63d24d6f8d17532604cd24fa [2021-11-07 00:54:22,165 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:54:22,167 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:54:22,170 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:54:22,170 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:54:22,175 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:54:22,175 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:54:22" (1/1) ... [2021-11-07 00:54:22,178 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@315ee5ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:22, skipping insertion in model container [2021-11-07 00:54:22,178 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:54:22" (1/1) ... [2021-11-07 00:54:22,185 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:54:22,273 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:54:22,857 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/sv-benchmarks/c/product-lines/email_spec4_product13.cil.c[42804,42817] [2021-11-07 00:54:22,942 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:54:22,959 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-07 00:54:22,961 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@72cf21e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:22, skipping insertion in model container [2021-11-07 00:54:22,961 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:54:22,962 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:54:22,965 INFO L168 Benchmark]: Toolchain (without parser) took 795.56 ms. Allocated memory is still 138.4 MB. Free memory was 95.8 MB in the beginning and 98.2 MB in the end (delta: -2.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:54:22,967 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory was 115.3 MB in the beginning and 115.3 MB in the end (delta: 36.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:54:22,969 INFO L168 Benchmark]: CACSL2BoogieTranslator took 792.10 ms. Allocated memory is still 138.4 MB. Free memory was 95.6 MB in the beginning and 98.2 MB in the end (delta: -2.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-11-07 00:54:22,971 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory was 115.3 MB in the beginning and 115.3 MB in the end (delta: 36.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 792.10 ms. Allocated memory is still 138.4 MB. Free memory was 95.6 MB in the beginning and 98.2 MB in the end (delta: -2.7 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 119]: 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec4_product13.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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 a4d75af8ac92d9f5b92cf5fbd6315f6202b8108aa1e42fc32d65f286c89fdf2f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:54:25,186 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:54:25,189 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:54:25,244 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:54:25,244 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:54:25,248 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:54:25,250 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:54:25,254 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:54:25,258 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:54:25,266 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:54:25,267 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:54:25,269 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:54:25,269 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:54:25,272 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:54:25,274 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:54:25,278 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:54:25,280 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:54:25,281 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:54:25,283 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:54:25,307 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:54:25,309 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:54:25,310 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:54:25,313 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:54:25,315 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:54:25,324 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:54:25,325 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:54:25,325 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:54:25,327 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:54:25,328 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:54:25,329 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:54:25,329 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:54:25,330 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:54:25,332 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:54:25,333 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:54:25,334 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:54:25,334 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:54:25,335 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:54:25,335 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:54:25,336 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:54:25,337 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:54:25,338 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:54:25,339 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:54:25,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:54:25,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:54:25,380 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:54:25,381 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:54:25,381 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:54:25,381 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:54:25,381 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:54:25,382 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:54:25,382 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:54:25,383 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:54:25,383 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:54:25,383 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:54:25,383 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:54:25,384 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:54:25,384 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:54:25,384 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:54:25,384 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:54:25,384 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:54:25,385 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:54:25,385 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:54:25,385 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:54:25,385 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:54:25,386 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:54:25,386 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:54:25,386 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:54:25,386 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:54:25,387 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:54:25,387 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:54:25,387 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:54:25,387 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:54:25,387 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:54:25,388 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:25,388 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:54:25,388 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:54:25,388 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:54:25,389 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a4d75af8ac92d9f5b92cf5fbd6315f6202b8108aa1e42fc32d65f286c89fdf2f [2021-11-07 00:54:25,751 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:54:25,774 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:54:25,776 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:54:25,778 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:54:25,778 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:54:25,779 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec4_product13.cil.c [2021-11-07 00:54:25,866 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/afcfa4d72/9213eb29922f4af3ab1e4169f6e97cdf/FLAG9a224880a [2021-11-07 00:54:26,526 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:54:26,526 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/sv-benchmarks/c/product-lines/email_spec4_product13.cil.c [2021-11-07 00:54:26,555 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/afcfa4d72/9213eb29922f4af3ab1e4169f6e97cdf/FLAG9a224880a [2021-11-07 00:54:26,766 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/data/afcfa4d72/9213eb29922f4af3ab1e4169f6e97cdf [2021-11-07 00:54:26,770 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:54:26,772 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:54:26,776 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:54:26,776 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:54:26,780 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:54:26,780 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:54:26" (1/1) ... [2021-11-07 00:54:26,783 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6db85485 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:26, skipping insertion in model container [2021-11-07 00:54:26,783 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:54:26" (1/1) ... [2021-11-07 00:54:26,792 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:54:26,881 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:54:27,494 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/sv-benchmarks/c/product-lines/email_spec4_product13.cil.c[42804,42817] [2021-11-07 00:54:27,578 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:54:27,594 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:54:27,618 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:54:27,694 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/sv-benchmarks/c/product-lines/email_spec4_product13.cil.c[42804,42817] [2021-11-07 00:54:27,721 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:54:27,734 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:54:27,817 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_e225be9c-1c10-4765-8d68-f74bab4b0c4f/sv-benchmarks/c/product-lines/email_spec4_product13.cil.c[42804,42817] [2021-11-07 00:54:27,838 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:54:27,875 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:54:27,876 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27 WrapperNode [2021-11-07 00:54:27,876 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:54:27,877 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:54:27,877 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:54:27,878 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:54:27,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:27,920 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,022 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:54:28,023 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:54:28,023 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:54:28,023 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:54:28,032 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,033 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,040 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,041 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,090 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,109 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,115 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,125 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:54:28,140 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:54:28,140 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:54:28,141 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:54:28,141 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (1/1) ... [2021-11-07 00:54:28,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:54:28,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:54:28,193 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:54:28,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:54:28,252 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:54:28,252 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:54:28,254 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:54:28,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:54:28,255 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:54:32,464 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:54:32,464 INFO L299 CfgBuilder]: Removed 235 assume(true) statements. [2021-11-07 00:54:32,468 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:54:32 BoogieIcfgContainer [2021-11-07 00:54:32,468 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:54:32,470 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:54:32,470 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:54:32,474 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:54:32,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:54:26" (1/3) ... [2021-11-07 00:54:32,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6be023f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:54:32, skipping insertion in model container [2021-11-07 00:54:32,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:54:27" (2/3) ... [2021-11-07 00:54:32,476 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6be023f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:54:32, skipping insertion in model container [2021-11-07 00:54:32,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:54:32" (3/3) ... [2021-11-07 00:54:32,477 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec4_product13.cil.c [2021-11-07 00:54:32,487 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:54:32,487 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:54:32,536 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:54:32,543 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 00:54:32,543 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:54:32,568 INFO L276 IsEmpty]: Start isEmpty. Operand has 383 states, 380 states have (on average 1.7710526315789474) internal successors, (673), 382 states have internal predecessors, (673), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:32,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-07 00:54:32,580 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:32,581 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] [2021-11-07 00:54:32,582 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:32,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:32,588 INFO L85 PathProgramCache]: Analyzing trace with hash -2045115247, now seen corresponding path program 1 times [2021-11-07 00:54:32,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:32,604 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [26755640] [2021-11-07 00:54:32,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:32,605 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:32,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:32,609 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:32,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:54:32,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:32,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:54:33,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:33,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:33,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:33,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:33,312 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:33,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [26755640] [2021-11-07 00:54:33,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [26755640] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:33,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:33,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:54:33,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006833532] [2021-11-07 00:54:33,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:54:33,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:33,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:54:33,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:54:33,338 INFO L87 Difference]: Start difference. First operand has 383 states, 380 states have (on average 1.7710526315789474) internal successors, (673), 382 states have internal predecessors, (673), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:33,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:33,383 INFO L93 Difference]: Finished difference Result 528 states and 912 transitions. [2021-11-07 00:54:33,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:54:33,385 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 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 40 [2021-11-07 00:54:33,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:33,400 INFO L225 Difference]: With dead ends: 528 [2021-11-07 00:54:33,400 INFO L226 Difference]: Without dead ends: 344 [2021-11-07 00:54:33,404 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:54:33,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-11-07 00:54:33,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 344. [2021-11-07 00:54:33,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 342 states have (on average 1.760233918128655) internal successors, (602), 343 states have internal predecessors, (602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:33,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 602 transitions. [2021-11-07 00:54:33,470 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 602 transitions. Word has length 40 [2021-11-07 00:54:33,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:33,471 INFO L470 AbstractCegarLoop]: Abstraction has 344 states and 602 transitions. [2021-11-07 00:54:33,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:33,472 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 602 transitions. [2021-11-07 00:54:33,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-07 00:54:33,476 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:33,476 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:33,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:33,691 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:33,692 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:33,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:33,693 INFO L85 PathProgramCache]: Analyzing trace with hash -861910435, now seen corresponding path program 1 times [2021-11-07 00:54:33,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:33,694 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [873083877] [2021-11-07 00:54:33,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:33,694 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:33,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:33,696 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:33,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:54:34,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:34,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:54:34,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:34,218 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:34,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:34,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:34,338 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:34,338 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [873083877] [2021-11-07 00:54:34,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [873083877] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:34,339 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:34,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:54:34,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554822720] [2021-11-07 00:54:34,341 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:54:34,341 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:34,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:54:34,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:34,343 INFO L87 Difference]: Start difference. First operand 344 states and 602 transitions. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:34,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:34,464 INFO L93 Difference]: Finished difference Result 1002 states and 1758 transitions. [2021-11-07 00:54:34,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:54:34,464 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-07 00:54:34,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:34,474 INFO L225 Difference]: With dead ends: 1002 [2021-11-07 00:54:34,475 INFO L226 Difference]: Without dead ends: 673 [2021-11-07 00:54:34,481 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:34,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-11-07 00:54:34,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 343. [2021-11-07 00:54:34,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 341 states have (on average 1.750733137829912) internal successors, (597), 342 states have internal predecessors, (597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:34,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 597 transitions. [2021-11-07 00:54:34,526 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 597 transitions. Word has length 41 [2021-11-07 00:54:34,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:34,527 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 597 transitions. [2021-11-07 00:54:34,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:34,527 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 597 transitions. [2021-11-07 00:54:34,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-07 00:54:34,530 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:34,531 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] [2021-11-07 00:54:34,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:34,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:34,745 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:34,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:34,746 INFO L85 PathProgramCache]: Analyzing trace with hash 945796035, now seen corresponding path program 1 times [2021-11-07 00:54:34,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:34,747 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1222673672] [2021-11-07 00:54:34,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:34,747 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:34,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:34,749 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:34,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:54:35,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:35,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:54:35,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:35,257 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:35,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:35,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:35,383 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:35,383 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1222673672] [2021-11-07 00:54:35,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1222673672] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:35,384 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:35,384 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:54:35,384 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196667540] [2021-11-07 00:54:35,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:54:35,385 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:35,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:54:35,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:54:35,387 INFO L87 Difference]: Start difference. First operand 343 states and 597 transitions. Second operand has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:35,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:35,646 INFO L93 Difference]: Finished difference Result 1289 states and 2250 transitions. [2021-11-07 00:54:35,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:54:35,646 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 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 43 [2021-11-07 00:54:35,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:35,657 INFO L225 Difference]: With dead ends: 1289 [2021-11-07 00:54:35,657 INFO L226 Difference]: Without dead ends: 964 [2021-11-07 00:54:35,659 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:54:35,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 964 states. [2021-11-07 00:54:35,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 964 to 342. [2021-11-07 00:54:35,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 340 states have (on average 1.7441176470588236) internal successors, (593), 341 states have internal predecessors, (593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:35,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 593 transitions. [2021-11-07 00:54:35,708 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 593 transitions. Word has length 43 [2021-11-07 00:54:35,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:35,708 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 593 transitions. [2021-11-07 00:54:35,710 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.0) internal successors, (48), 6 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:35,711 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 593 transitions. [2021-11-07 00:54:35,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 00:54:35,714 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:35,714 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:35,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:35,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:35,931 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:35,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:35,934 INFO L85 PathProgramCache]: Analyzing trace with hash 836086358, now seen corresponding path program 1 times [2021-11-07 00:54:35,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:35,936 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1328305977] [2021-11-07 00:54:35,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:35,937 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:35,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:35,939 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:35,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:54:36,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:36,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:54:36,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:36,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:36,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:36,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:36,572 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:36,573 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1328305977] [2021-11-07 00:54:36,573 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1328305977] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:36,574 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:36,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:54:36,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723655606] [2021-11-07 00:54:36,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:54:36,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:36,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:54:36,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:36,577 INFO L87 Difference]: Start difference. First operand 342 states and 593 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:36,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:36,651 INFO L93 Difference]: Finished difference Result 681 states and 1183 transitions. [2021-11-07 00:54:36,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:54:36,652 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-07 00:54:36,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:36,655 INFO L225 Difference]: With dead ends: 681 [2021-11-07 00:54:36,655 INFO L226 Difference]: Without dead ends: 347 [2021-11-07 00:54:36,656 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:36,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2021-11-07 00:54:36,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 342. [2021-11-07 00:54:36,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 340 states have (on average 1.7352941176470589) internal successors, (590), 341 states have internal predecessors, (590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 590 transitions. [2021-11-07 00:54:36,691 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 590 transitions. Word has length 44 [2021-11-07 00:54:36,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:36,691 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 590 transitions. [2021-11-07 00:54:36,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:36,692 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 590 transitions. [2021-11-07 00:54:36,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 00:54:36,694 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:36,694 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:36,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:36,909 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:36,910 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:36,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:36,910 INFO L85 PathProgramCache]: Analyzing trace with hash -1027434837, now seen corresponding path program 1 times [2021-11-07 00:54:36,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:36,911 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [206502058] [2021-11-07 00:54:36,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:36,912 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:36,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:36,913 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:36,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:54:37,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:37,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:54:37,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:37,492 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:37,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:37,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:37,634 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:37,634 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [206502058] [2021-11-07 00:54:37,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [206502058] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:37,634 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:37,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:54:37,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583573251] [2021-11-07 00:54:37,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:54:37,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:37,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:54:37,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:54:37,637 INFO L87 Difference]: Start difference. First operand 342 states and 590 transitions. Second operand has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:37,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:37,921 INFO L93 Difference]: Finished difference Result 1276 states and 2226 transitions. [2021-11-07 00:54:37,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:54:37,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 00:54:37,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:37,929 INFO L225 Difference]: With dead ends: 1276 [2021-11-07 00:54:37,929 INFO L226 Difference]: Without dead ends: 960 [2021-11-07 00:54:37,930 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:54:37,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 960 states. [2021-11-07 00:54:37,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 960 to 342. [2021-11-07 00:54:37,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 340 states have (on average 1.7264705882352942) internal successors, (587), 341 states have internal predecessors, (587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:37,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 587 transitions. [2021-11-07 00:54:37,978 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 587 transitions. Word has length 45 [2021-11-07 00:54:37,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:37,980 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 587 transitions. [2021-11-07 00:54:37,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:37,981 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 587 transitions. [2021-11-07 00:54:37,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 00:54:37,983 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:37,983 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:38,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-07 00:54:38,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:38,197 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:38,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:38,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1520446810, now seen corresponding path program 1 times [2021-11-07 00:54:38,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:38,198 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [665018091] [2021-11-07 00:54:38,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:38,199 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:38,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:38,201 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:38,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 00:54:38,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:38,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:38,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:38,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:38,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:38,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:38,885 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:38,886 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [665018091] [2021-11-07 00:54:38,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [665018091] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:38,886 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:38,886 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:54:38,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960970255] [2021-11-07 00:54:38,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:54:38,887 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:38,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:54:38,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:38,888 INFO L87 Difference]: Start difference. First operand 342 states and 587 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:38,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:38,981 INFO L93 Difference]: Finished difference Result 764 states and 1315 transitions. [2021-11-07 00:54:38,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:54:38,982 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-07 00:54:38,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:38,987 INFO L225 Difference]: With dead ends: 764 [2021-11-07 00:54:38,987 INFO L226 Difference]: Without dead ends: 658 [2021-11-07 00:54:38,988 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:38,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-11-07 00:54:39,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 552. [2021-11-07 00:54:39,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 552 states, 550 states have (on average 1.7654545454545454) internal successors, (971), 551 states have internal predecessors, (971), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:39,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 971 transitions. [2021-11-07 00:54:39,039 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 971 transitions. Word has length 47 [2021-11-07 00:54:39,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:39,040 INFO L470 AbstractCegarLoop]: Abstraction has 552 states and 971 transitions. [2021-11-07 00:54:39,040 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:39,041 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 971 transitions. [2021-11-07 00:54:39,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 00:54:39,042 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:39,043 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:39,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:39,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:39,258 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:39,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:39,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1864377111, now seen corresponding path program 1 times [2021-11-07 00:54:39,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:39,260 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2144766456] [2021-11-07 00:54:39,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:39,260 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:39,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:39,261 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:39,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 00:54:39,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:39,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:39,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:39,887 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:39,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:40,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:40,056 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:40,056 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2144766456] [2021-11-07 00:54:40,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2144766456] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:40,056 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:40,057 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:54:40,057 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504840688] [2021-11-07 00:54:40,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:40,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:40,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:40,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:40,059 INFO L87 Difference]: Start difference. First operand 552 states and 971 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:40,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:40,137 INFO L93 Difference]: Finished difference Result 1284 states and 2268 transitions. [2021-11-07 00:54:40,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:40,138 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-07 00:54:40,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:40,144 INFO L225 Difference]: With dead ends: 1284 [2021-11-07 00:54:40,144 INFO L226 Difference]: Without dead ends: 816 [2021-11-07 00:54:40,145 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:40,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 816 states. [2021-11-07 00:54:40,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 816 to 710. [2021-11-07 00:54:40,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 710 states, 708 states have (on average 1.7768361581920904) internal successors, (1258), 709 states have internal predecessors, (1258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:40,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 710 states to 710 states and 1258 transitions. [2021-11-07 00:54:40,201 INFO L78 Accepts]: Start accepts. Automaton has 710 states and 1258 transitions. Word has length 59 [2021-11-07 00:54:40,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:40,202 INFO L470 AbstractCegarLoop]: Abstraction has 710 states and 1258 transitions. [2021-11-07 00:54:40,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:40,202 INFO L276 IsEmpty]: Start isEmpty. Operand 710 states and 1258 transitions. [2021-11-07 00:54:40,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-07 00:54:40,204 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:40,204 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:40,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:40,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:40,419 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:40,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:40,419 INFO L85 PathProgramCache]: Analyzing trace with hash -325908874, now seen corresponding path program 1 times [2021-11-07 00:54:40,420 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:40,420 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1022829699] [2021-11-07 00:54:40,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:40,421 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:40,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:40,422 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:40,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 00:54:40,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:40,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:40,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:41,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:41,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:41,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:41,188 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:41,189 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1022829699] [2021-11-07 00:54:41,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1022829699] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:41,189 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:41,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:54:41,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163606598] [2021-11-07 00:54:41,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:41,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:41,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:41,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:41,191 INFO L87 Difference]: Start difference. First operand 710 states and 1258 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:41,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:41,296 INFO L93 Difference]: Finished difference Result 1802 states and 3215 transitions. [2021-11-07 00:54:41,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:41,296 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-07 00:54:41,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:41,305 INFO L225 Difference]: With dead ends: 1802 [2021-11-07 00:54:41,305 INFO L226 Difference]: Without dead ends: 1180 [2021-11-07 00:54:41,307 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:41,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1180 states. [2021-11-07 00:54:41,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1180 to 1074. [2021-11-07 00:54:41,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1074 states, 1072 states have (on average 1.7929104477611941) internal successors, (1922), 1073 states have internal predecessors, (1922), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:41,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1074 states to 1074 states and 1922 transitions. [2021-11-07 00:54:41,390 INFO L78 Accepts]: Start accepts. Automaton has 1074 states and 1922 transitions. Word has length 60 [2021-11-07 00:54:41,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:41,391 INFO L470 AbstractCegarLoop]: Abstraction has 1074 states and 1922 transitions. [2021-11-07 00:54:41,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:41,391 INFO L276 IsEmpty]: Start isEmpty. Operand 1074 states and 1922 transitions. [2021-11-07 00:54:41,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 00:54:41,394 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:41,394 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] [2021-11-07 00:54:41,412 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-07 00:54:41,609 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:41,609 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:41,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:41,610 INFO L85 PathProgramCache]: Analyzing trace with hash 1689679878, now seen corresponding path program 1 times [2021-11-07 00:54:41,610 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:41,611 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [486820576] [2021-11-07 00:54:41,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:41,611 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:41,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:41,612 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:41,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 00:54:42,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:42,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:42,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:42,247 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:42,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:42,411 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:42,412 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:42,412 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [486820576] [2021-11-07 00:54:42,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [486820576] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:42,412 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:42,412 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:54:42,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762474215] [2021-11-07 00:54:42,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:54:42,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:42,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:54:42,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:42,414 INFO L87 Difference]: Start difference. First operand 1074 states and 1922 transitions. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 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 00:54:42,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:42,514 INFO L93 Difference]: Finished difference Result 2012 states and 3596 transitions. [2021-11-07 00:54:42,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:42,514 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 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 61 [2021-11-07 00:54:42,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:42,523 INFO L225 Difference]: With dead ends: 2012 [2021-11-07 00:54:42,523 INFO L226 Difference]: Without dead ends: 1180 [2021-11-07 00:54:42,525 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:54:42,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1180 states. [2021-11-07 00:54:42,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1180 to 1074. [2021-11-07 00:54:42,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1074 states, 1072 states have (on average 1.791044776119403) internal successors, (1920), 1073 states have internal predecessors, (1920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:42,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1074 states to 1074 states and 1920 transitions. [2021-11-07 00:54:42,626 INFO L78 Accepts]: Start accepts. Automaton has 1074 states and 1920 transitions. Word has length 61 [2021-11-07 00:54:42,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:42,627 INFO L470 AbstractCegarLoop]: Abstraction has 1074 states and 1920 transitions. [2021-11-07 00:54:42,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 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 00:54:42,628 INFO L276 IsEmpty]: Start isEmpty. Operand 1074 states and 1920 transitions. [2021-11-07 00:54:42,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 00:54:42,630 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:42,630 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:42,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:42,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:42,844 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:42,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:42,844 INFO L85 PathProgramCache]: Analyzing trace with hash -2129521083, now seen corresponding path program 1 times [2021-11-07 00:54:42,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:42,845 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1074278755] [2021-11-07 00:54:42,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:42,845 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:42,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:42,847 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:42,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 00:54:43,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:43,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:43,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:43,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:43,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:43,700 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:43,700 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:43,700 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1074278755] [2021-11-07 00:54:43,701 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1074278755] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:43,701 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:43,701 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:54:43,701 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977496802] [2021-11-07 00:54:43,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:43,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:43,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:43,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:43,706 INFO L87 Difference]: Start difference. First operand 1074 states and 1920 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:43,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:43,862 INFO L93 Difference]: Finished difference Result 2866 states and 5156 transitions. [2021-11-07 00:54:43,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:43,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-07 00:54:43,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:43,875 INFO L225 Difference]: With dead ends: 2866 [2021-11-07 00:54:43,875 INFO L226 Difference]: Without dead ends: 1888 [2021-11-07 00:54:43,881 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:43,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1888 states. [2021-11-07 00:54:44,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1888 to 1782. [2021-11-07 00:54:44,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1782 states, 1780 states have (on average 1.803932584269663) internal successors, (3211), 1781 states have internal predecessors, (3211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:44,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1782 states to 1782 states and 3211 transitions. [2021-11-07 00:54:44,043 INFO L78 Accepts]: Start accepts. Automaton has 1782 states and 3211 transitions. Word has length 61 [2021-11-07 00:54:44,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:44,043 INFO L470 AbstractCegarLoop]: Abstraction has 1782 states and 3211 transitions. [2021-11-07 00:54:44,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:44,044 INFO L276 IsEmpty]: Start isEmpty. Operand 1782 states and 3211 transitions. [2021-11-07 00:54:44,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-07 00:54:44,047 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:44,048 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:44,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:44,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:44,263 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:44,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:44,264 INFO L85 PathProgramCache]: Analyzing trace with hash 1313764920, now seen corresponding path program 1 times [2021-11-07 00:54:44,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:44,265 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [975476988] [2021-11-07 00:54:44,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:44,265 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:44,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:44,266 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:44,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 00:54:44,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:44,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:44,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:44,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:44,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:45,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:45,081 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:45,081 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [975476988] [2021-11-07 00:54:45,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [975476988] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:45,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:45,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:54:45,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922269243] [2021-11-07 00:54:45,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:45,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:45,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:45,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:45,084 INFO L87 Difference]: Start difference. First operand 1782 states and 3211 transitions. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:45,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:45,310 INFO L93 Difference]: Finished difference Result 4726 states and 8548 transitions. [2021-11-07 00:54:45,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:45,311 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-07 00:54:45,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:45,337 INFO L225 Difference]: With dead ends: 4726 [2021-11-07 00:54:45,337 INFO L226 Difference]: Without dead ends: 3074 [2021-11-07 00:54:45,340 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:45,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3074 states. [2021-11-07 00:54:45,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3074 to 2968. [2021-11-07 00:54:45,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2968 states, 2966 states have (on average 1.8098449089683075) internal successors, (5368), 2967 states have internal predecessors, (5368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:45,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2968 states to 2968 states and 5368 transitions. [2021-11-07 00:54:45,580 INFO L78 Accepts]: Start accepts. Automaton has 2968 states and 5368 transitions. Word has length 62 [2021-11-07 00:54:45,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:45,581 INFO L470 AbstractCegarLoop]: Abstraction has 2968 states and 5368 transitions. [2021-11-07 00:54:45,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:45,581 INFO L276 IsEmpty]: Start isEmpty. Operand 2968 states and 5368 transitions. [2021-11-07 00:54:45,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-07 00:54:45,585 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:45,585 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:45,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:45,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:45,800 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:45,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:45,800 INFO L85 PathProgramCache]: Analyzing trace with hash -436979882, now seen corresponding path program 1 times [2021-11-07 00:54:45,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:45,801 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [123077251] [2021-11-07 00:54:45,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:45,801 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:45,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:45,802 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:45,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 00:54:46,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:46,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:46,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:46,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:46,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:46,586 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:46,586 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [123077251] [2021-11-07 00:54:46,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [123077251] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:46,586 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:46,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:54:46,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785117672] [2021-11-07 00:54:46,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:46,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:46,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:46,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:46,588 INFO L87 Difference]: Start difference. First operand 2968 states and 5368 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:46,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:46,925 INFO L93 Difference]: Finished difference Result 8000 states and 14502 transitions. [2021-11-07 00:54:46,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:46,925 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-07 00:54:46,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:46,962 INFO L225 Difference]: With dead ends: 8000 [2021-11-07 00:54:46,962 INFO L226 Difference]: Without dead ends: 5196 [2021-11-07 00:54:46,967 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:46,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5196 states. [2021-11-07 00:54:47,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5196 to 5090. [2021-11-07 00:54:47,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5090 states, 5088 states have (on average 1.8115172955974843) internal successors, (9217), 5089 states have internal predecessors, (9217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:47,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5090 states to 5090 states and 9217 transitions. [2021-11-07 00:54:47,401 INFO L78 Accepts]: Start accepts. Automaton has 5090 states and 9217 transitions. Word has length 63 [2021-11-07 00:54:47,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:47,402 INFO L470 AbstractCegarLoop]: Abstraction has 5090 states and 9217 transitions. [2021-11-07 00:54:47,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 3 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:47,402 INFO L276 IsEmpty]: Start isEmpty. Operand 5090 states and 9217 transitions. [2021-11-07 00:54:47,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:54:47,406 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:47,406 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] [2021-11-07 00:54:47,427 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:47,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:47,621 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:47,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:47,622 INFO L85 PathProgramCache]: Analyzing trace with hash 148463450, now seen corresponding path program 1 times [2021-11-07 00:54:47,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:47,623 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2091340309] [2021-11-07 00:54:47,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:47,623 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:47,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:47,624 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:47,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 00:54:48,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:48,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:54:48,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:48,415 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:54:48,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:48,639 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 00:54:48,640 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:48,640 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2091340309] [2021-11-07 00:54:48,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2091340309] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:48,640 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:48,640 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:54:48,640 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275552231] [2021-11-07 00:54:48,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:54:48,641 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:48,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:54:48,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:54:48,642 INFO L87 Difference]: Start difference. First operand 5090 states and 9217 transitions. Second operand has 6 states, 6 states have (on average 14.333333333333334) internal successors, (86), 6 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:51,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:51,676 INFO L93 Difference]: Finished difference Result 19012 states and 34470 transitions. [2021-11-07 00:54:51,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:54:51,677 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.333333333333334) internal successors, (86), 6 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:54:51,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:51,741 INFO L225 Difference]: With dead ends: 19012 [2021-11-07 00:54:51,742 INFO L226 Difference]: Without dead ends: 14162 [2021-11-07 00:54:51,751 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:54:51,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14162 states. [2021-11-07 00:54:52,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14162 to 5040. [2021-11-07 00:54:52,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5040 states, 5038 states have (on average 1.7897975387058356) internal successors, (9017), 5039 states have internal predecessors, (9017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:52,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5040 states to 5040 states and 9017 transitions. [2021-11-07 00:54:52,267 INFO L78 Accepts]: Start accepts. Automaton has 5040 states and 9017 transitions. Word has length 64 [2021-11-07 00:54:52,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:52,267 INFO L470 AbstractCegarLoop]: Abstraction has 5040 states and 9017 transitions. [2021-11-07 00:54:52,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.333333333333334) internal successors, (86), 6 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:52,268 INFO L276 IsEmpty]: Start isEmpty. Operand 5040 states and 9017 transitions. [2021-11-07 00:54:52,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:54:52,274 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:52,275 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:52,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:52,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:52,490 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:52,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:52,491 INFO L85 PathProgramCache]: Analyzing trace with hash -118139543, now seen corresponding path program 1 times [2021-11-07 00:54:52,492 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:52,492 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [216467682] [2021-11-07 00:54:52,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:52,492 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:52,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:52,494 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:52,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 00:54:53,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:53,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:54:53,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:53,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:53,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:53,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:53,486 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:53,486 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [216467682] [2021-11-07 00:54:53,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [216467682] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:53,487 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:54:53,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:54:53,487 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6610036] [2021-11-07 00:54:53,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:54:53,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:53,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:54:53,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:53,489 INFO L87 Difference]: Start difference. First operand 5040 states and 9017 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:54,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:54:54,131 INFO L93 Difference]: Finished difference Result 14677 states and 26303 transitions. [2021-11-07 00:54:54,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:54:54,132 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-07 00:54:54,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:54:54,161 INFO L225 Difference]: With dead ends: 14677 [2021-11-07 00:54:54,161 INFO L226 Difference]: Without dead ends: 9804 [2021-11-07 00:54:54,170 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:54:54,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9804 states. [2021-11-07 00:54:54,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9804 to 9698. [2021-11-07 00:54:54,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9698 states, 9696 states have (on average 1.7898102310231023) internal successors, (17354), 9697 states have internal predecessors, (17354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:54,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9698 states to 9698 states and 17354 transitions. [2021-11-07 00:54:54,816 INFO L78 Accepts]: Start accepts. Automaton has 9698 states and 17354 transitions. Word has length 64 [2021-11-07 00:54:54,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:54:54,816 INFO L470 AbstractCegarLoop]: Abstraction has 9698 states and 17354 transitions. [2021-11-07 00:54:54,817 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:54:54,817 INFO L276 IsEmpty]: Start isEmpty. Operand 9698 states and 17354 transitions. [2021-11-07 00:54:54,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 00:54:54,822 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:54:54,822 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:54:54,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 00:54:55,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:54:55,037 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:54:55,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:54:55,037 INFO L85 PathProgramCache]: Analyzing trace with hash 2145452373, now seen corresponding path program 1 times [2021-11-07 00:54:55,038 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:54:55,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1098291106] [2021-11-07 00:54:55,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:55,038 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:54:55,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:54:55,039 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:54:55,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 00:54:55,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:55,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:54:55,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:55,837 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:55,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:56,053 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:54:56,054 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:54:56,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1098291106] [2021-11-07 00:54:56,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1098291106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:54:56,054 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2035508948] [2021-11-07 00:54:56,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:54:56,055 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:54:56,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:54:56,057 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:54:56,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 00:54:56,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:54:56,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:54:56,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:54:57,096 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:54:57,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:54:57,365 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:54:57,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2035508948] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:54:57,366 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:54:57,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 00:54:57,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621261597] [2021-11-07 00:54:57,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 00:54:57,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:54:57,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 00:54:57,368 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:54:57,369 INFO L87 Difference]: Start difference. First operand 9698 states and 17354 transitions. Second operand has 10 states, 10 states have (on average 10.0) internal successors, (100), 10 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:03,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:03,222 INFO L93 Difference]: Finished difference Result 56851 states and 102261 transitions. [2021-11-07 00:55:03,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:55:03,223 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 10.0) internal successors, (100), 10 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 00:55:03,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:03,409 INFO L225 Difference]: With dead ends: 56851 [2021-11-07 00:55:03,409 INFO L226 Difference]: Without dead ends: 56763 [2021-11-07 00:55:03,423 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 00:55:03,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56763 states. [2021-11-07 00:55:05,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56763 to 19358. [2021-11-07 00:55:05,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19358 states, 19356 states have (on average 1.7901425914445133) internal successors, (34650), 19357 states have internal predecessors, (34650), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:05,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19358 states to 19358 states and 34650 transitions. [2021-11-07 00:55:05,206 INFO L78 Accepts]: Start accepts. Automaton has 19358 states and 34650 transitions. Word has length 65 [2021-11-07 00:55:05,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:05,206 INFO L470 AbstractCegarLoop]: Abstraction has 19358 states and 34650 transitions. [2021-11-07 00:55:05,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 10.0) internal successors, (100), 10 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:05,207 INFO L276 IsEmpty]: Start isEmpty. Operand 19358 states and 34650 transitions. [2021-11-07 00:55:05,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:55:05,215 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:05,216 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:55:05,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:05,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 00:55:05,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:05,631 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:05,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:05,631 INFO L85 PathProgramCache]: Analyzing trace with hash 1880153937, now seen corresponding path program 1 times [2021-11-07 00:55:05,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:05,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [160113823] [2021-11-07 00:55:05,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:05,632 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:05,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:05,633 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:05,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 00:55:06,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:06,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:06,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:06,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:06,625 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:06,625 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:06,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [160113823] [2021-11-07 00:55:06,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [160113823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:06,626 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1040037739] [2021-11-07 00:55:06,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:06,626 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:06,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:06,630 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:06,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 00:55:07,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:07,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:55:07,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:07,722 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:07,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:07,918 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:07,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1040037739] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:07,919 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:07,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 00:55:07,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504995805] [2021-11-07 00:55:07,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:55:07,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:07,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:55:07,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:55:07,921 INFO L87 Difference]: Start difference. First operand 19358 states and 34650 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:10,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:10,940 INFO L93 Difference]: Finished difference Result 19627 states and 35081 transitions. [2021-11-07 00:55:10,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:55:10,941 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:55:10,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:10,985 INFO L225 Difference]: With dead ends: 19627 [2021-11-07 00:55:10,985 INFO L226 Difference]: Without dead ends: 19461 [2021-11-07 00:55:10,992 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 251 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 00:55:11,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19461 states. [2021-11-07 00:55:12,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19461 to 19352. [2021-11-07 00:55:12,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19352 states, 19350 states have (on average 1.7900258397932816) internal successors, (34637), 19351 states have internal predecessors, (34637), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:12,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19352 states to 19352 states and 34637 transitions. [2021-11-07 00:55:12,358 INFO L78 Accepts]: Start accepts. Automaton has 19352 states and 34637 transitions. Word has length 66 [2021-11-07 00:55:12,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:12,359 INFO L470 AbstractCegarLoop]: Abstraction has 19352 states and 34637 transitions. [2021-11-07 00:55:12,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:12,359 INFO L276 IsEmpty]: Start isEmpty. Operand 19352 states and 34637 transitions. [2021-11-07 00:55:12,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:55:12,377 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:12,377 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:55:12,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:12,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:12,788 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:12,788 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:12,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:12,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1337676488, now seen corresponding path program 1 times [2021-11-07 00:55:12,789 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:12,789 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [351988161] [2021-11-07 00:55:12,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:12,789 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:12,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:12,790 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:12,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 00:55:13,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:13,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 464 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:55:13,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:13,625 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:13,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:13,783 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:13,783 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:13,784 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [351988161] [2021-11-07 00:55:13,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [351988161] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:13,784 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:55:13,784 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 00:55:13,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698719287] [2021-11-07 00:55:13,785 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:55:13,785 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:13,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:55:13,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:55:13,786 INFO L87 Difference]: Start difference. First operand 19352 states and 34637 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:14,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:14,830 INFO L93 Difference]: Finished difference Result 37778 states and 67841 transitions. [2021-11-07 00:55:14,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:55:14,831 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:55:14,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:14,858 INFO L225 Difference]: With dead ends: 37778 [2021-11-07 00:55:14,858 INFO L226 Difference]: Without dead ends: 18669 [2021-11-07 00:55:14,885 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 128 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 00:55:14,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18669 states. [2021-11-07 00:55:15,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18669 to 9696. [2021-11-07 00:55:15,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9696 states, 9694 states have (on average 1.789251083144213) internal successors, (17345), 9695 states have internal predecessors, (17345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:15,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9696 states to 9696 states and 17345 transitions. [2021-11-07 00:55:15,665 INFO L78 Accepts]: Start accepts. Automaton has 9696 states and 17345 transitions. Word has length 66 [2021-11-07 00:55:15,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:15,665 INFO L470 AbstractCegarLoop]: Abstraction has 9696 states and 17345 transitions. [2021-11-07 00:55:15,665 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:15,666 INFO L276 IsEmpty]: Start isEmpty. Operand 9696 states and 17345 transitions. [2021-11-07 00:55:15,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 00:55:15,671 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:15,671 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] [2021-11-07 00:55:15,683 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:15,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:55:15,873 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:15,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:15,874 INFO L85 PathProgramCache]: Analyzing trace with hash 105215135, now seen corresponding path program 1 times [2021-11-07 00:55:15,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:15,875 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [765985599] [2021-11-07 00:55:15,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:15,875 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:15,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:15,876 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:15,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 00:55:16,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:16,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:16,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:16,806 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:16,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:17,006 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:17,006 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:17,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [765985599] [2021-11-07 00:55:17,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [765985599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:17,007 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [242036593] [2021-11-07 00:55:17,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:17,007 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:17,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:17,008 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:17,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 00:55:17,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:17,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 00:55:17,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:18,283 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:18,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:18,629 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:18,629 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [242036593] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:18,630 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:18,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 00:55:18,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246383899] [2021-11-07 00:55:18,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 00:55:18,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:18,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 00:55:18,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-11-07 00:55:18,631 INFO L87 Difference]: Start difference. First operand 9696 states and 17345 transitions. Second operand has 11 states, 11 states have (on average 10.636363636363637) internal successors, (117), 11 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:24,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:24,984 INFO L93 Difference]: Finished difference Result 37567 states and 67665 transitions. [2021-11-07 00:55:24,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 00:55:24,985 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 10.636363636363637) internal successors, (117), 11 states have internal predecessors, (117), 0 states have call successors, (0), 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 00:55:24,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:25,043 INFO L225 Difference]: With dead ends: 37567 [2021-11-07 00:55:25,043 INFO L226 Difference]: Without dead ends: 37555 [2021-11-07 00:55:25,054 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=958, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 00:55:25,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37555 states. [2021-11-07 00:55:25,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37555 to 9698. [2021-11-07 00:55:25,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9698 states, 9696 states have (on average 1.7889851485148516) internal successors, (17346), 9697 states have internal predecessors, (17346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:25,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9698 states to 9698 states and 17346 transitions. [2021-11-07 00:55:25,933 INFO L78 Accepts]: Start accepts. Automaton has 9698 states and 17346 transitions. Word has length 68 [2021-11-07 00:55:25,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:25,934 INFO L470 AbstractCegarLoop]: Abstraction has 9698 states and 17346 transitions. [2021-11-07 00:55:25,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 10.636363636363637) internal successors, (117), 11 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:25,934 INFO L276 IsEmpty]: Start isEmpty. Operand 9698 states and 17346 transitions. [2021-11-07 00:55:25,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:55:25,939 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:25,940 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 00:55:25,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:26,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:26,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:55:26,345 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:26,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:26,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1031720831, now seen corresponding path program 1 times [2021-11-07 00:55:26,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:26,346 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [906493067] [2021-11-07 00:55:26,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:26,346 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:26,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:26,347 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:26,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 00:55:27,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:27,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:27,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:27,245 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:27,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:27,459 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:27,459 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:27,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [906493067] [2021-11-07 00:55:27,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [906493067] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:27,459 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1446994082] [2021-11-07 00:55:27,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:27,460 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:27,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:27,461 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:27,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 00:55:28,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:28,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 00:55:28,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:28,776 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:28,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:28,986 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:28,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1446994082] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:28,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:28,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 00:55:28,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020105511] [2021-11-07 00:55:28,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 00:55:28,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:28,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 00:55:28,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-07 00:55:28,988 INFO L87 Difference]: Start difference. First operand 9698 states and 17346 transitions. Second operand has 8 states, 8 states have (on average 7.875) internal successors, (63), 8 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:31,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:31,699 INFO L93 Difference]: Finished difference Result 9786 states and 17486 transitions. [2021-11-07 00:55:31,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 00:55:31,699 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 7.875) internal successors, (63), 8 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:55:31,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:31,712 INFO L225 Difference]: With dead ends: 9786 [2021-11-07 00:55:31,712 INFO L226 Difference]: Without dead ends: 9709 [2021-11-07 00:55:31,715 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=394, Unknown=0, NotChecked=0, Total=506 [2021-11-07 00:55:31,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9709 states. [2021-11-07 00:55:32,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9709 to 9692. [2021-11-07 00:55:32,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9692 states, 9691 states have (on average 1.7889794654834383) internal successors, (17337), 9691 states have internal predecessors, (17337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:32,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9692 states to 9692 states and 17337 transitions. [2021-11-07 00:55:32,276 INFO L78 Accepts]: Start accepts. Automaton has 9692 states and 17337 transitions. Word has length 69 [2021-11-07 00:55:32,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:32,276 INFO L470 AbstractCegarLoop]: Abstraction has 9692 states and 17337 transitions. [2021-11-07 00:55:32,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 7.875) internal successors, (63), 8 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:32,277 INFO L276 IsEmpty]: Start isEmpty. Operand 9692 states and 17337 transitions. [2021-11-07 00:55:32,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-07 00:55:32,290 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:32,290 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] [2021-11-07 00:55:32,315 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:32,507 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Ended with exit code 0 [2021-11-07 00:55:32,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:32,704 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:32,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:32,704 INFO L85 PathProgramCache]: Analyzing trace with hash -366438816, now seen corresponding path program 1 times [2021-11-07 00:55:32,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:32,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [104284225] [2021-11-07 00:55:32,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:32,705 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:32,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:32,706 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:32,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 00:55:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:33,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:33,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:33,756 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:33,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:34,009 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:34,009 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:34,009 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [104284225] [2021-11-07 00:55:34,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [104284225] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:34,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1947190462] [2021-11-07 00:55:34,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:34,010 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:34,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:34,021 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:34,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 00:55:35,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:35,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:55:35,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:35,392 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:35,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:35,623 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:35,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1947190462] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:35,623 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:35,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 00:55:35,623 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080175479] [2021-11-07 00:55:35,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 00:55:35,624 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:35,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 00:55:35,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 00:55:35,624 INFO L87 Difference]: Start difference. First operand 9692 states and 17337 transitions. Second operand has 11 states, 11 states have (on average 9.090909090909092) internal successors, (100), 11 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:38,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:38,474 INFO L93 Difference]: Finished difference Result 10202 states and 18154 transitions. [2021-11-07 00:55:38,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 00:55:38,475 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 9.090909090909092) internal successors, (100), 11 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-07 00:55:38,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:38,487 INFO L225 Difference]: With dead ends: 10202 [2021-11-07 00:55:38,487 INFO L226 Difference]: Without dead ends: 10131 [2021-11-07 00:55:38,491 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=469, Unknown=0, NotChecked=0, Total=600 [2021-11-07 00:55:38,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10131 states. [2021-11-07 00:55:39,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10131 to 9706. [2021-11-07 00:55:39,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9706 states, 9705 states have (on average 1.788665636269964) internal successors, (17359), 9705 states have internal predecessors, (17359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:39,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9706 states to 9706 states and 17359 transitions. [2021-11-07 00:55:39,031 INFO L78 Accepts]: Start accepts. Automaton has 9706 states and 17359 transitions. Word has length 92 [2021-11-07 00:55:39,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:39,031 INFO L470 AbstractCegarLoop]: Abstraction has 9706 states and 17359 transitions. [2021-11-07 00:55:39,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 9.090909090909092) internal successors, (100), 11 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:39,032 INFO L276 IsEmpty]: Start isEmpty. Operand 9706 states and 17359 transitions. [2021-11-07 00:55:39,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-07 00:55:39,045 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:39,045 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] [2021-11-07 00:55:39,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:39,253 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Ended with exit code 0 [2021-11-07 00:55:39,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:39,446 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:39,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:39,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1738928961, now seen corresponding path program 1 times [2021-11-07 00:55:39,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:39,448 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1972835846] [2021-11-07 00:55:39,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:39,448 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:39,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:39,449 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:39,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 00:55:40,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:40,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:40,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:40,598 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:40,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:40,838 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:40,838 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:40,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1972835846] [2021-11-07 00:55:40,839 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1972835846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:40,839 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [675670629] [2021-11-07 00:55:40,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:40,839 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:40,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:40,840 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:40,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 00:55:42,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:42,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-07 00:55:42,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:42,315 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:42,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:42,501 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:42,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [675670629] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:42,502 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:42,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 00:55:42,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377679902] [2021-11-07 00:55:42,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 00:55:42,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:42,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 00:55:42,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 00:55:42,503 INFO L87 Difference]: Start difference. First operand 9706 states and 17359 transitions. Second operand has 7 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:43,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:43,171 INFO L93 Difference]: Finished difference Result 9843 states and 17572 transitions. [2021-11-07 00:55:43,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 00:55:43,171 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-07 00:55:43,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:43,182 INFO L225 Difference]: With dead ends: 9843 [2021-11-07 00:55:43,182 INFO L226 Difference]: Without dead ends: 9766 [2021-11-07 00:55:43,184 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 357 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 00:55:43,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9766 states. [2021-11-07 00:55:43,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9766 to 9705. [2021-11-07 00:55:43,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9705 states, 9704 states have (on average 1.7884377576257213) internal successors, (17355), 9704 states have internal predecessors, (17355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:43,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9705 states to 9705 states and 17355 transitions. [2021-11-07 00:55:43,722 INFO L78 Accepts]: Start accepts. Automaton has 9705 states and 17355 transitions. Word has length 93 [2021-11-07 00:55:43,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:43,722 INFO L470 AbstractCegarLoop]: Abstraction has 9705 states and 17355 transitions. [2021-11-07 00:55:43,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:43,722 INFO L276 IsEmpty]: Start isEmpty. Operand 9705 states and 17355 transitions. [2021-11-07 00:55:43,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-07 00:55:43,732 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:43,732 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] [2021-11-07 00:55:43,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:43,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:44,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:55:44,136 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:44,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:44,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1384039650, now seen corresponding path program 1 times [2021-11-07 00:55:44,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:44,137 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [875325134] [2021-11-07 00:55:44,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:44,138 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:44,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:44,138 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:44,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 00:55:45,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:45,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:45,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:45,318 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:45,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:45,556 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:45,556 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:45,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [875325134] [2021-11-07 00:55:45,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [875325134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:45,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1270569938] [2021-11-07 00:55:45,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:45,557 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:45,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:45,557 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:45,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 00:55:46,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:46,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 00:55:46,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:47,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:47,298 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:47,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1270569938] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:47,299 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:47,299 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 00:55:47,299 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520188693] [2021-11-07 00:55:47,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:55:47,300 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:47,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:55:47,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 00:55:47,301 INFO L87 Difference]: Start difference. First operand 9705 states and 17355 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:47,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:47,829 INFO L93 Difference]: Finished difference Result 9801 states and 17502 transitions. [2021-11-07 00:55:47,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:55:47,831 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 93 [2021-11-07 00:55:47,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:47,845 INFO L225 Difference]: With dead ends: 9801 [2021-11-07 00:55:47,845 INFO L226 Difference]: Without dead ends: 9712 [2021-11-07 00:55:47,848 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:55:47,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9712 states. [2021-11-07 00:55:48,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9712 to 9690. [2021-11-07 00:55:48,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9690 states, 9689 states have (on average 1.7886262772215915) internal successors, (17330), 9689 states have internal predecessors, (17330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:48,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9690 states to 9690 states and 17330 transitions. [2021-11-07 00:55:48,439 INFO L78 Accepts]: Start accepts. Automaton has 9690 states and 17330 transitions. Word has length 93 [2021-11-07 00:55:48,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:48,440 INFO L470 AbstractCegarLoop]: Abstraction has 9690 states and 17330 transitions. [2021-11-07 00:55:48,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:48,440 INFO L276 IsEmpty]: Start isEmpty. Operand 9690 states and 17330 transitions. [2021-11-07 00:55:48,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-07 00:55:48,450 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:48,450 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] [2021-11-07 00:55:48,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:48,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:48,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:55:48,851 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:48,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:48,852 INFO L85 PathProgramCache]: Analyzing trace with hash 621508977, now seen corresponding path program 1 times [2021-11-07 00:55:48,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:48,852 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [233458024] [2021-11-07 00:55:48,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:48,852 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:48,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:48,853 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:48,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 00:55:49,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:49,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:49,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:50,121 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:50,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:50,374 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:50,374 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:50,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [233458024] [2021-11-07 00:55:50,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [233458024] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:50,375 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1859838143] [2021-11-07 00:55:50,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:50,375 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:50,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:50,376 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:50,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 00:55:51,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:51,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 00:55:51,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:52,097 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:52,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:52,334 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:52,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1859838143] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:52,334 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:52,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5] total 13 [2021-11-07 00:55:52,335 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139768501] [2021-11-07 00:55:52,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 00:55:52,335 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:52,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 00:55:52,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-11-07 00:55:52,336 INFO L87 Difference]: Start difference. First operand 9690 states and 17330 transitions. Second operand has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:52,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:55:52,912 INFO L93 Difference]: Finished difference Result 9727 states and 17383 transitions. [2021-11-07 00:55:52,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:55:52,913 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 0 states have call successors, (0), 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 95 [2021-11-07 00:55:52,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:55:52,925 INFO L225 Difference]: With dead ends: 9727 [2021-11-07 00:55:52,925 INFO L226 Difference]: Without dead ends: 9690 [2021-11-07 00:55:52,928 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:55:52,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9690 states. [2021-11-07 00:55:53,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9690 to 9690. [2021-11-07 00:55:53,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9690 states, 9689 states have (on average 1.7885230673960162) internal successors, (17329), 9689 states have internal predecessors, (17329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:53,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9690 states to 9690 states and 17329 transitions. [2021-11-07 00:55:53,440 INFO L78 Accepts]: Start accepts. Automaton has 9690 states and 17329 transitions. Word has length 95 [2021-11-07 00:55:53,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:55:53,440 INFO L470 AbstractCegarLoop]: Abstraction has 9690 states and 17329 transitions. [2021-11-07 00:55:53,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.428571428571429) internal successors, (94), 7 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:55:53,440 INFO L276 IsEmpty]: Start isEmpty. Operand 9690 states and 17329 transitions. [2021-11-07 00:55:53,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-07 00:55:53,451 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:55:53,452 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:55:53,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 00:55:53,657 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Ended with exit code 0 [2021-11-07 00:55:53,852 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:53,852 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:55:53,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:55:53,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1255063606, now seen corresponding path program 1 times [2021-11-07 00:55:53,853 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:55:53,853 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [44487911] [2021-11-07 00:55:53,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:53,853 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:55:53,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:55:53,854 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:55:53,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 00:55:54,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:54,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:55:54,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:55,195 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:55,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:55,446 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:55:55,446 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:55:55,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [44487911] [2021-11-07 00:55:55,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [44487911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:55:55,446 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [447505986] [2021-11-07 00:55:55,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:55:55,447 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:55:55,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:55:55,447 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:55:55,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 00:55:56,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:55:56,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:55:57,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:55:57,352 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:57,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:55:57,612 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:55:57,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [447505986] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:55:57,612 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:55:57,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 00:55:57,612 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384266260] [2021-11-07 00:55:57,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 00:55:57,613 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:55:57,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 00:55:57,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 00:55:57,614 INFO L87 Difference]: Start difference. First operand 9690 states and 17329 transitions. Second operand has 11 states, 11 states have (on average 10.636363636363637) internal successors, (117), 11 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:02,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:02,389 INFO L93 Difference]: Finished difference Result 9854 states and 17564 transitions. [2021-11-07 00:56:02,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 00:56:02,390 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 10.636363636363637) internal successors, (117), 11 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2021-11-07 00:56:02,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:02,401 INFO L225 Difference]: With dead ends: 9854 [2021-11-07 00:56:02,401 INFO L226 Difference]: Without dead ends: 9817 [2021-11-07 00:56:02,403 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 373 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=432, Unknown=0, NotChecked=0, Total=552 [2021-11-07 00:56:02,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9817 states. [2021-11-07 00:56:02,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9817 to 9692. [2021-11-07 00:56:02,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9692 states, 9691 states have (on average 1.7883603343308223) internal successors, (17331), 9691 states have internal predecessors, (17331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:02,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9692 states to 9692 states and 17331 transitions. [2021-11-07 00:56:02,914 INFO L78 Accepts]: Start accepts. Automaton has 9692 states and 17331 transitions. Word has length 98 [2021-11-07 00:56:02,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:02,914 INFO L470 AbstractCegarLoop]: Abstraction has 9692 states and 17331 transitions. [2021-11-07 00:56:02,914 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 10.636363636363637) internal successors, (117), 11 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:02,914 INFO L276 IsEmpty]: Start isEmpty. Operand 9692 states and 17331 transitions. [2021-11-07 00:56:02,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-07 00:56:02,924 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:02,924 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:02,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:03,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-07 00:56:03,325 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:03,325 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:03,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:03,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1614071587, now seen corresponding path program 1 times [2021-11-07 00:56:03,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:03,326 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [104822762] [2021-11-07 00:56:03,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:03,327 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:03,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:03,327 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:03,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 00:56:04,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:04,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:04,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:04,762 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:04,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:05,041 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:05,041 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:05,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [104822762] [2021-11-07 00:56:05,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [104822762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:56:05,042 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [30254104] [2021-11-07 00:56:05,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:05,042 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:05,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:56:05,048 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:56:05,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 00:56:06,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:06,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 579 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 00:56:06,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:07,068 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:07,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:07,283 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:07,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [30254104] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:07,283 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:56:07,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 00:56:07,284 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401071355] [2021-11-07 00:56:07,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 00:56:07,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:07,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 00:56:07,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:56:07,285 INFO L87 Difference]: Start difference. First operand 9692 states and 17331 transitions. Second operand has 9 states, 9 states have (on average 10.333333333333334) internal successors, (93), 9 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:07,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:07,967 INFO L93 Difference]: Finished difference Result 9762 states and 17437 transitions. [2021-11-07 00:56:07,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-07 00:56:07,967 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 10.333333333333334) internal successors, (93), 9 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-07 00:56:07,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:07,979 INFO L225 Difference]: With dead ends: 9762 [2021-11-07 00:56:07,979 INFO L226 Difference]: Without dead ends: 9698 [2021-11-07 00:56:07,982 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 379 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-11-07 00:56:07,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9698 states. [2021-11-07 00:56:08,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9698 to 9689. [2021-11-07 00:56:08,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9689 states, 9688 states have (on average 1.7882947976878614) internal successors, (17325), 9688 states have internal predecessors, (17325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:08,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9689 states to 9689 states and 17325 transitions. [2021-11-07 00:56:08,561 INFO L78 Accepts]: Start accepts. Automaton has 9689 states and 17325 transitions. Word has length 99 [2021-11-07 00:56:08,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:08,561 INFO L470 AbstractCegarLoop]: Abstraction has 9689 states and 17325 transitions. [2021-11-07 00:56:08,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 10.333333333333334) internal successors, (93), 9 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:08,561 INFO L276 IsEmpty]: Start isEmpty. Operand 9689 states and 17325 transitions. [2021-11-07 00:56:08,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-11-07 00:56:08,570 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:08,571 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] [2021-11-07 00:56:08,587 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:08,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:08,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:08,971 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:08,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:08,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1781394138, now seen corresponding path program 1 times [2021-11-07 00:56:08,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:08,972 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [316114906] [2021-11-07 00:56:08,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:08,972 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:08,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:08,973 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:08,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 00:56:10,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:10,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:10,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:10,496 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:10,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:10,782 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:10,783 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:10,783 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [316114906] [2021-11-07 00:56:10,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [316114906] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:56:10,783 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1456772815] [2021-11-07 00:56:10,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:10,784 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:10,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:56:10,801 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:56:10,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 00:56:12,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:12,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:56:12,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:13,488 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:13,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:13,986 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:13,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1456772815] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:13,986 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:56:13,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 00:56:13,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066268531] [2021-11-07 00:56:13,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 00:56:13,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:13,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 00:56:13,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 00:56:13,988 INFO L87 Difference]: Start difference. First operand 9689 states and 17325 transitions. Second operand has 18 states, 18 states have (on average 9.61111111111111) internal successors, (173), 17 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:30,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:30,744 INFO L93 Difference]: Finished difference Result 29461 states and 52537 transitions. [2021-11-07 00:56:30,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:56:30,745 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 9.61111111111111) internal successors, (173), 17 states have internal predecessors, (173), 0 states have call successors, (0), 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 105 [2021-11-07 00:56:30,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:30,787 INFO L225 Difference]: With dead ends: 29461 [2021-11-07 00:56:30,788 INFO L226 Difference]: Without dead ends: 29413 [2021-11-07 00:56:30,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=438, Invalid=1632, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 00:56:30,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29413 states. [2021-11-07 00:56:32,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29413 to 19311. [2021-11-07 00:56:32,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19311 states, 19310 states have (on average 1.7889694458829621) internal successors, (34545), 19310 states have internal predecessors, (34545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:32,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19311 states to 19311 states and 34545 transitions. [2021-11-07 00:56:32,070 INFO L78 Accepts]: Start accepts. Automaton has 19311 states and 34545 transitions. Word has length 105 [2021-11-07 00:56:32,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:32,070 INFO L470 AbstractCegarLoop]: Abstraction has 19311 states and 34545 transitions. [2021-11-07 00:56:32,070 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 9.61111111111111) internal successors, (173), 17 states have internal predecessors, (173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:32,071 INFO L276 IsEmpty]: Start isEmpty. Operand 19311 states and 34545 transitions. [2021-11-07 00:56:32,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-07 00:56:32,088 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:32,088 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] [2021-11-07 00:56:32,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:32,311 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-07 00:56:32,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:32,504 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:32,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:32,504 INFO L85 PathProgramCache]: Analyzing trace with hash 1503309724, now seen corresponding path program 1 times [2021-11-07 00:56:32,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:32,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2067073799] [2021-11-07 00:56:32,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:32,505 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:32,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:32,506 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:32,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 00:56:33,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:33,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:33,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:34,144 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:34,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:34,406 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:34,407 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:34,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2067073799] [2021-11-07 00:56:34,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2067073799] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:56:34,407 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [846151923] [2021-11-07 00:56:34,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:34,407 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:34,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:56:34,408 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:56:34,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 00:56:36,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:36,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-07 00:56:36,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:36,692 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:36,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:36,962 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:36,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [846151923] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:36,963 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:56:36,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 15 [2021-11-07 00:56:36,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078882100] [2021-11-07 00:56:36,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 00:56:36,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:36,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 00:56:36,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:56:36,964 INFO L87 Difference]: Start difference. First operand 19311 states and 34545 transitions. Second operand has 9 states, 9 states have (on average 11.11111111111111) internal successors, (100), 9 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:42,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:42,286 INFO L93 Difference]: Finished difference Result 19660 states and 35055 transitions. [2021-11-07 00:56:42,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 00:56:42,286 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 11.11111111111111) internal successors, (100), 9 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-07 00:56:42,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:42,313 INFO L225 Difference]: With dead ends: 19660 [2021-11-07 00:56:42,313 INFO L226 Difference]: Without dead ends: 19606 [2021-11-07 00:56:42,319 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 407 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-11-07 00:56:42,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19606 states. [2021-11-07 00:56:43,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19606 to 19370. [2021-11-07 00:56:43,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19370 states, 19369 states have (on average 1.7873405957974082) internal successors, (34619), 19369 states have internal predecessors, (34619), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:43,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19370 states to 19370 states and 34619 transitions. [2021-11-07 00:56:43,547 INFO L78 Accepts]: Start accepts. Automaton has 19370 states and 34619 transitions. Word has length 106 [2021-11-07 00:56:43,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:43,548 INFO L470 AbstractCegarLoop]: Abstraction has 19370 states and 34619 transitions. [2021-11-07 00:56:43,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 11.11111111111111) internal successors, (100), 9 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:43,548 INFO L276 IsEmpty]: Start isEmpty. Operand 19370 states and 34619 transitions. [2021-11-07 00:56:43,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-07 00:56:43,566 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:43,567 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] [2021-11-07 00:56:43,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:43,786 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-07 00:56:43,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:43,974 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:43,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:43,975 INFO L85 PathProgramCache]: Analyzing trace with hash 2104368040, now seen corresponding path program 1 times [2021-11-07 00:56:43,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:43,975 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [415254654] [2021-11-07 00:56:43,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:43,975 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:43,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:43,977 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:43,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-07 00:56:45,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:45,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:56:45,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:45,708 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:45,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:45,963 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:45,963 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:45,963 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [415254654] [2021-11-07 00:56:45,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [415254654] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:56:45,963 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1410881746] [2021-11-07 00:56:45,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:45,964 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:45,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:56:45,964 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:56:45,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-07 00:56:48,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:48,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:56:48,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:48,905 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:48,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:49,371 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:56:49,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1410881746] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:49,372 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:56:49,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 00:56:49,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031701940] [2021-11-07 00:56:49,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 00:56:49,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:49,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 00:56:49,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 00:56:49,373 INFO L87 Difference]: Start difference. First operand 19370 states and 34619 transitions. Second operand has 18 states, 18 states have (on average 9.722222222222221) internal successors, (175), 17 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:09,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:09,471 INFO L93 Difference]: Finished difference Result 48600 states and 86722 transitions. [2021-11-07 00:57:09,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:57:09,471 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 9.722222222222221) internal successors, (175), 17 states have internal predecessors, (175), 0 states have call successors, (0), 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 106 [2021-11-07 00:57:09,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:09,548 INFO L225 Difference]: With dead ends: 48600 [2021-11-07 00:57:09,548 INFO L226 Difference]: Without dead ends: 48552 [2021-11-07 00:57:09,558 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 398 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=438, Invalid=1632, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 00:57:09,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48552 states. [2021-11-07 00:57:12,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48552 to 38361. [2021-11-07 00:57:12,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38361 states, 38360 states have (on average 1.7888425443169969) internal successors, (68620), 38360 states have internal predecessors, (68620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:12,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38361 states to 38361 states and 68620 transitions. [2021-11-07 00:57:12,155 INFO L78 Accepts]: Start accepts. Automaton has 38361 states and 68620 transitions. Word has length 106 [2021-11-07 00:57:12,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:12,155 INFO L470 AbstractCegarLoop]: Abstraction has 38361 states and 68620 transitions. [2021-11-07 00:57:12,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 9.722222222222221) internal successors, (175), 17 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:12,156 INFO L276 IsEmpty]: Start isEmpty. Operand 38361 states and 68620 transitions. [2021-11-07 00:57:12,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 00:57:12,235 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:12,236 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] [2021-11-07 00:57:12,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:12,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:12,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:12,644 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:12,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:12,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1417389111, now seen corresponding path program 1 times [2021-11-07 00:57:12,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:12,645 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [274409905] [2021-11-07 00:57:12,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:12,646 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:12,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:12,647 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:12,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-07 00:57:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:14,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:14,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:14,466 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:14,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:14,720 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:14,720 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:14,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [274409905] [2021-11-07 00:57:14,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [274409905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:14,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2071535883] [2021-11-07 00:57:14,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:14,721 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:14,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:14,722 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:14,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-07 00:57:16,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:16,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 00:57:16,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:17,858 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:17,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:18,392 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:18,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2071535883] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:18,392 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:18,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 9] imperfect sequences [5, 5] total 24 [2021-11-07 00:57:18,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487244268] [2021-11-07 00:57:18,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 00:57:18,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:18,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 00:57:18,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2021-11-07 00:57:18,394 INFO L87 Difference]: Start difference. First operand 38361 states and 68620 transitions. Second operand has 18 states, 18 states have (on average 9.833333333333334) internal successors, (177), 17 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:48,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:48,860 INFO L93 Difference]: Finished difference Result 86330 states and 154283 transitions. [2021-11-07 00:57:48,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:57:48,860 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 9.833333333333334) internal successors, (177), 17 states have internal predecessors, (177), 0 states have call successors, (0), 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 107 [2021-11-07 00:57:48,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:49,000 INFO L225 Difference]: With dead ends: 86330 [2021-11-07 00:57:49,000 INFO L226 Difference]: Without dead ends: 86282 [2021-11-07 00:57:49,014 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=438, Invalid=1632, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 00:57:49,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86282 states. [2021-11-07 00:57:54,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86282 to 76092. [2021-11-07 00:57:54,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76092 states, 76091 states have (on average 1.7897386024628406) internal successors, (136183), 76091 states have internal predecessors, (136183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:54,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76092 states to 76092 states and 136183 transitions. [2021-11-07 00:57:54,565 INFO L78 Accepts]: Start accepts. Automaton has 76092 states and 136183 transitions. Word has length 107 [2021-11-07 00:57:54,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:54,566 INFO L470 AbstractCegarLoop]: Abstraction has 76092 states and 136183 transitions. [2021-11-07 00:57:54,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 9.833333333333334) internal successors, (177), 17 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:54,566 INFO L276 IsEmpty]: Start isEmpty. Operand 76092 states and 136183 transitions. [2021-11-07 00:57:54,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 00:57:54,651 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:54,651 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] [2021-11-07 00:57:54,667 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-07 00:57:54,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:55,052 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:55,052 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:55,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:55,053 INFO L85 PathProgramCache]: Analyzing trace with hash 1479428725, now seen corresponding path program 1 times [2021-11-07 00:57:55,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:55,054 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1554649185] [2021-11-07 00:57:55,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:55,054 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:55,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:55,055 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:55,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-07 00:57:56,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:56,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:56,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:57,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:57,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:57,497 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:57,497 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:57,498 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1554649185] [2021-11-07 00:57:57,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1554649185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:57,498 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1981586264] [2021-11-07 00:57:57,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:57,498 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:57,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:57,507 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:57,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-07 00:57:59,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:59,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:57:59,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:00,362 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:00,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:00,749 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:00,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1981586264] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:00,749 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:00,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [5, 5] total 15 [2021-11-07 00:58:00,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719119348] [2021-11-07 00:58:00,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 00:58:00,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:00,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 00:58:00,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:58:00,751 INFO L87 Difference]: Start difference. First operand 76092 states and 136183 transitions. Second operand has 9 states, 9 states have (on average 20.333333333333332) internal successors, (183), 8 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:07,865 INFO L93 Difference]: Finished difference Result 76092 states and 136183 transitions. [2021-11-07 00:58:07,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 00:58:07,865 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 20.333333333333332) internal successors, (183), 8 states have internal predecessors, (183), 0 states have call successors, (0), 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 107 [2021-11-07 00:58:07,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:07,866 INFO L225 Difference]: With dead ends: 76092 [2021-11-07 00:58:07,866 INFO L226 Difference]: Without dead ends: 0 [2021-11-07 00:58:07,901 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-11-07 00:58:07,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-07 00:58:07,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-07 00:58:07,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-07 00:58:07,902 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 107 [2021-11-07 00:58:07,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:07,902 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-07 00:58:07,903 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 20.333333333333332) internal successors, (183), 8 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,903 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-07 00:58:07,903 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-07 00:58:07,906 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-11-07 00:58:07,906 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION [2021-11-07 00:58:07,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-07 00:58:08,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:08,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e225be9c-1c10-4765-8d68-f74bab4b0c4f/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:08,317 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-07 00:58:08,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:10,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:16,910 WARN L207 SmtUtils]: Spent 6.48 s on a formula simplification. DAG size of input: 1082 DAG size of output: 977 [2021-11-07 00:58:16,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:17,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:17,826 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:21,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:21,525 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:40,463 WARN L207 SmtUtils]: Spent 18.93 s on a formula simplification. DAG size of input: 2074 DAG size of output: 1799 [2021-11-07 00:58:40,471 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 00:58:59,726 WARN L207 SmtUtils]: Spent 19.24 s on a formula simplification. DAG size of input: 2074 DAG size of output: 1799 [2021-11-07 00:58:59,738 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms