./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec1_product28.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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec1_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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 25a137cac87a0e16e274f725e7bbd21e6c99dd9079b93c306fff086ae4fee1e1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:56:40,823 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:56:40,825 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:56:40,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:56:40,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:56:40,880 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:56:40,882 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:56:40,884 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:56:40,887 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:56:40,888 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:56:40,889 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:56:40,890 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:56:40,891 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:56:40,892 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:56:40,894 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:56:40,895 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:56:40,896 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:56:40,897 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:56:40,900 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:56:40,902 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:56:40,905 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:56:40,906 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:56:40,908 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:56:40,909 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:56:40,913 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:56:40,913 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:56:40,913 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:56:40,915 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:56:40,915 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:56:40,916 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:56:40,920 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:56:40,921 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:56:40,922 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:56:40,923 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:56:40,924 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:56:40,925 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:56:40,925 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:56:40,926 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:56:40,926 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:56:40,927 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:56:40,928 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:56:40,931 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 00:56:40,976 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:56:40,977 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:56:40,978 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:56:40,978 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:56:40,978 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:56:40,978 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:56:40,979 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 00:56:40,979 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:56:40,979 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:56:40,979 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 00:56:40,980 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 00:56:40,980 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:56:40,980 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 00:56:40,981 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 00:56:40,981 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 00:56:40,982 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:56:40,982 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:56:40,982 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 00:56:40,982 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:56:40,982 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:56:40,982 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:56:40,983 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:56:40,983 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:56:40,983 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:56:40,983 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:56:40,983 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:56:40,983 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:56:40,984 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:56:40,984 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:56:40,984 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:56:40,984 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:56:40,985 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:56:40,985 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:56:40,985 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:56:40,985 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 00:56:40,985 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 00:56:40,986 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:56:40,986 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:56:40,986 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:56:40,986 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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 25a137cac87a0e16e274f725e7bbd21e6c99dd9079b93c306fff086ae4fee1e1 [2021-11-07 00:56:41,241 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:56:41,282 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:56:41,284 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:56:41,285 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:56:41,286 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:56:41,287 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec1_product28.cil.c [2021-11-07 00:56:41,365 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/c3f4348b7/3d8ba07f0c3b4841b38da91fb5f9b11b/FLAG2ae67c48f [2021-11-07 00:56:41,957 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:56:41,961 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/sv-benchmarks/c/product-lines/email_spec1_product28.cil.c [2021-11-07 00:56:41,980 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/c3f4348b7/3d8ba07f0c3b4841b38da91fb5f9b11b/FLAG2ae67c48f [2021-11-07 00:56:42,165 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/c3f4348b7/3d8ba07f0c3b4841b38da91fb5f9b11b [2021-11-07 00:56:42,168 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:56:42,169 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:56:42,174 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:42,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:56:42,178 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:56:42,183 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:42" (1/1) ... [2021-11-07 00:56:42,184 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@62dea6ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:42, skipping insertion in model container [2021-11-07 00:56:42,184 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:42" (1/1) ... [2021-11-07 00:56:42,193 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:56:42,297 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:56:42,911 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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/sv-benchmarks/c/product-lines/email_spec1_product28.cil.c[51091,51104] [2021-11-07 00:56:42,958 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:42,970 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 00:56:42,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@4b670545 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:42, skipping insertion in model container [2021-11-07 00:56:42,970 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:42,971 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 00:56:42,973 INFO L168 Benchmark]: Toolchain (without parser) took 802.72 ms. Allocated memory was 88.1 MB in the beginning and 117.4 MB in the end (delta: 29.4 MB). Free memory was 51.7 MB in the beginning and 81.8 MB in the end (delta: -30.1 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-11-07 00:56:42,974 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 88.1 MB. Free memory was 60.4 MB in the beginning and 60.3 MB in the end (delta: 31.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 00:56:42,975 INFO L168 Benchmark]: CACSL2BoogieTranslator took 797.21 ms. Allocated memory was 88.1 MB in the beginning and 117.4 MB in the end (delta: 29.4 MB). Free memory was 51.4 MB in the beginning and 81.8 MB in the end (delta: -30.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2021-11-07 00:56:42,977 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 88.1 MB. Free memory was 60.4 MB in the beginning and 60.3 MB in the end (delta: 31.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 797.21 ms. Allocated memory was 88.1 MB in the beginning and 117.4 MB in the end (delta: 29.4 MB). Free memory was 51.4 MB in the beginning and 81.8 MB in the end (delta: -30.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 1157]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec1_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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 25a137cac87a0e16e274f725e7bbd21e6c99dd9079b93c306fff086ae4fee1e1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 00:56:45,012 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 00:56:45,014 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 00:56:45,060 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 00:56:45,061 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 00:56:45,065 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 00:56:45,067 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 00:56:45,071 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 00:56:45,074 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 00:56:45,082 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 00:56:45,083 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 00:56:45,085 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 00:56:45,085 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 00:56:45,087 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 00:56:45,089 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 00:56:45,093 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 00:56:45,095 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 00:56:45,096 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 00:56:45,098 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 00:56:45,105 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 00:56:45,107 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 00:56:45,109 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 00:56:45,113 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 00:56:45,114 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 00:56:45,123 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 00:56:45,123 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 00:56:45,124 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 00:56:45,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 00:56:45,126 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 00:56:45,127 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 00:56:45,128 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 00:56:45,129 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 00:56:45,131 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 00:56:45,132 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 00:56:45,133 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 00:56:45,133 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 00:56:45,134 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 00:56:45,134 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 00:56:45,135 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 00:56:45,136 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 00:56:45,137 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 00:56:45,142 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 00:56:45,187 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 00:56:45,187 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 00:56:45,189 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 00:56:45,189 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 00:56:45,189 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 00:56:45,189 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 00:56:45,189 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 00:56:45,189 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 00:56:45,190 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 00:56:45,191 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 00:56:45,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 00:56:45,192 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 00:56:45,192 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 00:56:45,192 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 00:56:45,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 00:56:45,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 00:56:45,193 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 00:56:45,193 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 00:56:45,193 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 00:56:45,194 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 00:56:45,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 00:56:45,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 00:56:45,194 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 00:56:45,194 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 00:56:45,195 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 00:56:45,195 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 00:56:45,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:56:45,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 00:56:45,195 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 00:56:45,195 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 00:56:45,196 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 00:56:45,196 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 00:56:45,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 00:56:45,196 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 00:56:45,197 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 00:56:45,197 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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 25a137cac87a0e16e274f725e7bbd21e6c99dd9079b93c306fff086ae4fee1e1 [2021-11-07 00:56:45,582 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 00:56:45,608 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 00:56:45,613 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 00:56:45,615 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 00:56:45,615 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 00:56:45,616 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec1_product28.cil.c [2021-11-07 00:56:45,701 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/f1cb23412/2cf0b77b9b1a4919bce28b8758434c15/FLAG7a217a8e1 [2021-11-07 00:56:46,357 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 00:56:46,358 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/sv-benchmarks/c/product-lines/email_spec1_product28.cil.c [2021-11-07 00:56:46,386 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/f1cb23412/2cf0b77b9b1a4919bce28b8758434c15/FLAG7a217a8e1 [2021-11-07 00:56:46,543 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/data/f1cb23412/2cf0b77b9b1a4919bce28b8758434c15 [2021-11-07 00:56:46,549 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 00:56:46,551 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 00:56:46,554 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:46,555 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 00:56:46,558 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 00:56:46,559 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:46" (1/1) ... [2021-11-07 00:56:46,560 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55f9f4b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:46, skipping insertion in model container [2021-11-07 00:56:46,560 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 12:56:46" (1/1) ... [2021-11-07 00:56:46,568 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 00:56:46,690 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:56:47,264 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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/sv-benchmarks/c/product-lines/email_spec1_product28.cil.c[51091,51104] [2021-11-07 00:56:47,346 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:47,371 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 00:56:47,394 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 00:56:47,479 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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/sv-benchmarks/c/product-lines/email_spec1_product28.cil.c[51091,51104] [2021-11-07 00:56:47,494 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:47,507 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 00:56:47,596 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_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/sv-benchmarks/c/product-lines/email_spec1_product28.cil.c[51091,51104] [2021-11-07 00:56:47,610 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 00:56:47,649 INFO L208 MainTranslator]: Completed translation [2021-11-07 00:56:47,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47 WrapperNode [2021-11-07 00:56:47,650 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 00:56:47,651 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 00:56:47,651 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 00:56:47,651 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 00:56:47,658 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,701 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,793 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 00:56:47,794 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 00:56:47,794 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 00:56:47,794 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 00:56:47,802 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,803 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,828 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,829 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,951 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,973 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,987 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 00:56:47,988 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 00:56:47,988 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 00:56:47,988 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 00:56:47,992 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (1/1) ... [2021-11-07 00:56:47,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 00:56:48,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 00:56:48,034 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 00:56:48,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 00:56:48,078 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 00:56:48,078 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 00:56:48,078 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 00:56:48,078 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 00:56:48,078 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 00:56:52,254 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 00:56:52,257 INFO L299 CfgBuilder]: Removed 291 assume(true) statements. [2021-11-07 00:56:52,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:56:52 BoogieIcfgContainer [2021-11-07 00:56:52,261 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 00:56:52,264 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 00:56:52,264 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 00:56:52,267 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 00:56:52,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 12:56:46" (1/3) ... [2021-11-07 00:56:52,268 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d7b6edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:56:52, skipping insertion in model container [2021-11-07 00:56:52,268 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 12:56:47" (2/3) ... [2021-11-07 00:56:52,269 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d7b6edb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 12:56:52, skipping insertion in model container [2021-11-07 00:56:52,269 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 12:56:52" (3/3) ... [2021-11-07 00:56:52,270 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec1_product28.cil.c [2021-11-07 00:56:52,275 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 00:56:52,276 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 00:56:52,337 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 00:56:52,345 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 00:56:52,346 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 00:56:52,378 INFO L276 IsEmpty]: Start isEmpty. Operand has 475 states, 472 states have (on average 1.7648305084745763) internal successors, (833), 474 states have internal predecessors, (833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:52,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-07 00:56:52,393 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:52,393 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 00:56:52,394 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:52,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:52,399 INFO L85 PathProgramCache]: Analyzing trace with hash 701477098, now seen corresponding path program 1 times [2021-11-07 00:56:52,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:52,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [448558514] [2021-11-07 00:56:52,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:52,415 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:52,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:52,418 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:52,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 00:56:52,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:52,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 00:56:52,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:53,087 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 00:56:53,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:53,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:53,232 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:53,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [448558514] [2021-11-07 00:56:53,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [448558514] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:53,233 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:53,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 00:56:53,235 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705553790] [2021-11-07 00:56:53,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 00:56:53,242 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:53,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 00:56:53,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:56:53,261 INFO L87 Difference]: Start difference. First operand has 475 states, 472 states have (on average 1.7648305084745763) internal successors, (833), 474 states have internal predecessors, (833), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:53,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:53,341 INFO L93 Difference]: Finished difference Result 712 states and 1232 transitions. [2021-11-07 00:56:53,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 00:56:53,342 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2021-11-07 00:56:53,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:53,366 INFO L225 Difference]: With dead ends: 712 [2021-11-07 00:56:53,367 INFO L226 Difference]: Without dead ends: 406 [2021-11-07 00:56:53,374 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 00:56:53,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-07 00:56:53,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 406. [2021-11-07 00:56:53,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 406 states, 404 states have (on average 1.75990099009901) internal successors, (711), 405 states have internal predecessors, (711), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:53,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 406 states to 406 states and 711 transitions. [2021-11-07 00:56:53,463 INFO L78 Accepts]: Start accepts. Automaton has 406 states and 711 transitions. Word has length 45 [2021-11-07 00:56:53,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:53,463 INFO L470 AbstractCegarLoop]: Abstraction has 406 states and 711 transitions. [2021-11-07 00:56:53,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:53,463 INFO L276 IsEmpty]: Start isEmpty. Operand 406 states and 711 transitions. [2021-11-07 00:56:53,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-07 00:56:53,472 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:53,472 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:53,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:53,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:53,687 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:53,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:53,687 INFO L85 PathProgramCache]: Analyzing trace with hash 562637470, now seen corresponding path program 1 times [2021-11-07 00:56:53,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:53,688 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2056826831] [2021-11-07 00:56:53,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:53,689 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:53,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:53,690 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:53,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 00:56:54,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:54,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:56:54,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:54,256 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 00:56:54,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:54,374 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 00:56:54,374 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:54,374 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2056826831] [2021-11-07 00:56:54,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2056826831] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:54,375 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:54,375 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:54,375 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760614519] [2021-11-07 00:56:54,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:54,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:54,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:54,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:54,381 INFO L87 Difference]: Start difference. First operand 406 states and 711 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:54,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:54,502 INFO L93 Difference]: Finished difference Result 1188 states and 2085 transitions. [2021-11-07 00:56:54,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:56:54,503 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-07 00:56:54,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:54,509 INFO L225 Difference]: With dead ends: 1188 [2021-11-07 00:56:54,509 INFO L226 Difference]: Without dead ends: 797 [2021-11-07 00:56:54,512 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:54,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 797 states. [2021-11-07 00:56:54,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 797 to 405. [2021-11-07 00:56:54,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 403 states have (on average 1.751861042183623) internal successors, (706), 404 states have internal predecessors, (706), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:54,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 706 transitions. [2021-11-07 00:56:54,541 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 706 transitions. Word has length 46 [2021-11-07 00:56:54,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:54,542 INFO L470 AbstractCegarLoop]: Abstraction has 405 states and 706 transitions. [2021-11-07 00:56:54,542 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:54,542 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 706 transitions. [2021-11-07 00:56:54,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 00:56:54,544 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:54,544 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:54,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Ended with exit code 0 [2021-11-07 00:56:54,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:54,761 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:54,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:54,761 INFO L85 PathProgramCache]: Analyzing trace with hash 269594872, now seen corresponding path program 1 times [2021-11-07 00:56:54,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:54,763 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2064147862] [2021-11-07 00:56:54,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:54,763 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:54,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:54,764 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:54,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 00:56:55,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:55,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 456 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:56:55,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:55,392 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 00:56:55,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:55,546 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 00:56:55,546 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:55,546 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2064147862] [2021-11-07 00:56:55,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2064147862] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:55,547 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:55,547 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:56:55,547 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307661497] [2021-11-07 00:56:55,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:56:55,550 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:55,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:56:55,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:56:55,552 INFO L87 Difference]: Start difference. First operand 405 states and 706 transitions. Second operand has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:55,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:55,761 INFO L93 Difference]: Finished difference Result 1537 states and 2686 transitions. [2021-11-07 00:56:55,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:56:55,762 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-07 00:56:55,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:55,776 INFO L225 Difference]: With dead ends: 1537 [2021-11-07 00:56:55,777 INFO L226 Difference]: Without dead ends: 1150 [2021-11-07 00:56:55,778 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:56:55,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1150 states. [2021-11-07 00:56:55,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1150 to 404. [2021-11-07 00:56:55,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 402 states have (on average 1.7462686567164178) internal successors, (702), 403 states have internal predecessors, (702), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:55,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 702 transitions. [2021-11-07 00:56:55,827 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 702 transitions. Word has length 48 [2021-11-07 00:56:55,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:55,828 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 702 transitions. [2021-11-07 00:56:55,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.833333333333334) internal successors, (53), 6 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:55,829 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 702 transitions. [2021-11-07 00:56:55,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-07 00:56:55,833 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:55,833 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:55,859 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:56,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:56,055 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:56,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:56,055 INFO L85 PathProgramCache]: Analyzing trace with hash 2059263557, now seen corresponding path program 1 times [2021-11-07 00:56:56,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:56,057 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1700084982] [2021-11-07 00:56:56,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:56,057 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:56,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:56,061 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:56,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 00:56:56,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:56,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:56:56,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:56,603 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 00:56:56,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:56,734 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 00:56:56,734 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:56,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1700084982] [2021-11-07 00:56:56,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1700084982] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:56,735 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:56,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:56,735 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357474398] [2021-11-07 00:56:56,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:56,736 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:56,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:56,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:56,737 INFO L87 Difference]: Start difference. First operand 404 states and 702 transitions. Second operand has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:56,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:56,801 INFO L93 Difference]: Finished difference Result 805 states and 1401 transitions. [2021-11-07 00:56:56,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:56:56,802 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2021-11-07 00:56:56,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:56,805 INFO L225 Difference]: With dead ends: 805 [2021-11-07 00:56:56,805 INFO L226 Difference]: Without dead ends: 409 [2021-11-07 00:56:56,806 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:56,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-11-07 00:56:56,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 404. [2021-11-07 00:56:56,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 402 states have (on average 1.7388059701492538) internal successors, (699), 403 states have internal predecessors, (699), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:56,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 699 transitions. [2021-11-07 00:56:56,836 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 699 transitions. Word has length 49 [2021-11-07 00:56:56,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:56,836 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 699 transitions. [2021-11-07 00:56:56,837 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:56,837 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 699 transitions. [2021-11-07 00:56:56,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-07 00:56:56,838 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:56,838 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:56,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:57,060 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:57,060 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:57,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:57,061 INFO L85 PathProgramCache]: Analyzing trace with hash -435134704, now seen corresponding path program 1 times [2021-11-07 00:56:57,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:57,062 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [438151955] [2021-11-07 00:56:57,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:57,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:57,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:57,064 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:57,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 00:56:57,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:57,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:56:57,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:57,621 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 00:56:57,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:57,763 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 00:56:57,763 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:57,764 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [438151955] [2021-11-07 00:56:57,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [438151955] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:57,764 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:57,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:56:57,764 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546577494] [2021-11-07 00:56:57,765 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:56:57,765 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:57,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:56:57,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:56:57,766 INFO L87 Difference]: Start difference. First operand 404 states and 699 transitions. Second operand has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:57,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:57,981 INFO L93 Difference]: Finished difference Result 1524 states and 2662 transitions. [2021-11-07 00:56:57,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:56:57,982 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2021-11-07 00:56:57,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:57,989 INFO L225 Difference]: With dead ends: 1524 [2021-11-07 00:56:57,989 INFO L226 Difference]: Without dead ends: 1146 [2021-11-07 00:56:57,990 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-07 00:56:57,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1146 states. [2021-11-07 00:56:58,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1146 to 404. [2021-11-07 00:56:58,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 402 states have (on average 1.7313432835820894) internal successors, (696), 403 states have internal predecessors, (696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:58,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 696 transitions. [2021-11-07 00:56:58,027 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 696 transitions. Word has length 50 [2021-11-07 00:56:58,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:58,028 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 696 transitions. [2021-11-07 00:56:58,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:58,028 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 696 transitions. [2021-11-07 00:56:58,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 00:56:58,029 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:58,029 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:56:58,047 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:58,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:58,244 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:58,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:58,245 INFO L85 PathProgramCache]: Analyzing trace with hash 2010146805, now seen corresponding path program 1 times [2021-11-07 00:56:58,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:58,246 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1976972199] [2021-11-07 00:56:58,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:58,246 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:58,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:58,248 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:58,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 00:56:58,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:58,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:58,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:58,859 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 00:56:58,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:56:58,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:56:58,958 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:56:58,958 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1976972199] [2021-11-07 00:56:58,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1976972199] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:56:58,960 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:56:58,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:56:58,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694473207] [2021-11-07 00:56:58,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:56:58,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:56:58,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:56:58,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:58,962 INFO L87 Difference]: Start difference. First operand 404 states and 696 transitions. Second operand has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:59,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:56:59,034 INFO L93 Difference]: Finished difference Result 950 states and 1642 transitions. [2021-11-07 00:56:59,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:56:59,034 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-07 00:56:59,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:56:59,040 INFO L225 Difference]: With dead ends: 950 [2021-11-07 00:56:59,040 INFO L226 Difference]: Without dead ends: 782 [2021-11-07 00:56:59,041 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:56:59,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 782 states. [2021-11-07 00:56:59,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 782 to 614. [2021-11-07 00:56:59,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 614 states, 612 states have (on average 1.7647058823529411) internal successors, (1080), 613 states have internal predecessors, (1080), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:59,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 614 states to 614 states and 1080 transitions. [2021-11-07 00:56:59,095 INFO L78 Accepts]: Start accepts. Automaton has 614 states and 1080 transitions. Word has length 52 [2021-11-07 00:56:59,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:56:59,095 INFO L470 AbstractCegarLoop]: Abstraction has 614 states and 1080 transitions. [2021-11-07 00:56:59,095 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.75) internal successors, (55), 4 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:56:59,096 INFO L276 IsEmpty]: Start isEmpty. Operand 614 states and 1080 transitions. [2021-11-07 00:56:59,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-07 00:56:59,098 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:56:59,098 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 00:56:59,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 00:56:59,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:56:59,313 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:56:59,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:56:59,314 INFO L85 PathProgramCache]: Analyzing trace with hash 177583652, now seen corresponding path program 1 times [2021-11-07 00:56:59,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:56:59,315 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [193368344] [2021-11-07 00:56:59,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:56:59,315 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:56:59,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:56:59,316 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:56:59,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 00:56:59,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:56:59,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 472 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:56:59,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:56:59,956 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 00:56:59,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:00,110 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 00:57:00,110 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:00,110 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [193368344] [2021-11-07 00:57:00,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [193368344] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:00,111 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:00,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:57:00,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354035386] [2021-11-07 00:57:00,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:00,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:00,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:00,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:00,113 INFO L87 Difference]: Start difference. First operand 614 states and 1080 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 00:57:00,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:00,220 INFO L93 Difference]: Finished difference Result 1470 states and 2595 transitions. [2021-11-07 00:57:00,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:00,221 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 00:57:00,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:00,227 INFO L225 Difference]: With dead ends: 1470 [2021-11-07 00:57:00,227 INFO L226 Difference]: Without dead ends: 940 [2021-11-07 00:57:00,229 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 00:57:00,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 940 states. [2021-11-07 00:57:00,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 940 to 772. [2021-11-07 00:57:00,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 772 states, 770 states have (on average 1.7753246753246754) internal successors, (1367), 771 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:00,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 772 states to 772 states and 1367 transitions. [2021-11-07 00:57:00,300 INFO L78 Accepts]: Start accepts. Automaton has 772 states and 1367 transitions. Word has length 64 [2021-11-07 00:57:00,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:00,300 INFO L470 AbstractCegarLoop]: Abstraction has 772 states and 1367 transitions. [2021-11-07 00:57:00,300 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 00:57:00,301 INFO L276 IsEmpty]: Start isEmpty. Operand 772 states and 1367 transitions. [2021-11-07 00:57:00,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-07 00:57:00,302 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:00,302 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:00,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:00,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:00,520 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:00,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:00,520 INFO L85 PathProgramCache]: Analyzing trace with hash 580195877, now seen corresponding path program 1 times [2021-11-07 00:57:00,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:00,521 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [161511654] [2021-11-07 00:57:00,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:00,521 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:00,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:00,522 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:00,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 00:57:00,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:00,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:00,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:01,136 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 00:57:01,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:01,301 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 00:57:01,301 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:01,301 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [161511654] [2021-11-07 00:57:01,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [161511654] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:01,302 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:01,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:57:01,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632246826] [2021-11-07 00:57:01,302 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:01,302 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:01,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:01,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:01,303 INFO L87 Difference]: Start difference. First operand 772 states and 1367 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:01,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:01,422 INFO L93 Difference]: Finished difference Result 1988 states and 3542 transitions. [2021-11-07 00:57:01,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:01,423 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-07 00:57:01,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:01,431 INFO L225 Difference]: With dead ends: 1988 [2021-11-07 00:57:01,431 INFO L226 Difference]: Without dead ends: 1304 [2021-11-07 00:57:01,432 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:01,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1304 states. [2021-11-07 00:57:01,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1304 to 1136. [2021-11-07 00:57:01,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1136 states, 1134 states have (on average 1.791005291005291) internal successors, (2031), 1135 states have internal predecessors, (2031), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:01,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1136 states to 1136 states and 2031 transitions. [2021-11-07 00:57:01,521 INFO L78 Accepts]: Start accepts. Automaton has 1136 states and 2031 transitions. Word has length 65 [2021-11-07 00:57:01,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:01,521 INFO L470 AbstractCegarLoop]: Abstraction has 1136 states and 2031 transitions. [2021-11-07 00:57:01,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:01,522 INFO L276 IsEmpty]: Start isEmpty. Operand 1136 states and 2031 transitions. [2021-11-07 00:57:01,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:57:01,524 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:01,524 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:01,542 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:01,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:01,738 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:01,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:01,739 INFO L85 PathProgramCache]: Analyzing trace with hash 296361621, now seen corresponding path program 1 times [2021-11-07 00:57:01,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:01,739 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2106906693] [2021-11-07 00:57:01,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:01,739 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:01,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:01,740 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:01,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 00:57:02,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:02,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:02,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:02,388 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 00:57:02,388 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:02,537 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 00:57:02,538 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:02,538 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2106906693] [2021-11-07 00:57:02,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2106906693] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:02,538 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:02,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 00:57:02,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463842254] [2021-11-07 00:57:02,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:57:02,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:02,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:57:02,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:57:02,540 INFO L87 Difference]: Start difference. First operand 1136 states and 2031 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:02,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:02,677 INFO L93 Difference]: Finished difference Result 2198 states and 3923 transitions. [2021-11-07 00:57:02,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:02,678 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:57:02,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:02,686 INFO L225 Difference]: With dead ends: 2198 [2021-11-07 00:57:02,687 INFO L226 Difference]: Without dead ends: 1304 [2021-11-07 00:57:02,690 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:57:02,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1304 states. [2021-11-07 00:57:02,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1304 to 1136. [2021-11-07 00:57:02,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1136 states, 1134 states have (on average 1.789241622574956) internal successors, (2029), 1135 states have internal predecessors, (2029), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:02,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1136 states to 1136 states and 2029 transitions. [2021-11-07 00:57:02,781 INFO L78 Accepts]: Start accepts. Automaton has 1136 states and 2029 transitions. Word has length 66 [2021-11-07 00:57:02,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:02,783 INFO L470 AbstractCegarLoop]: Abstraction has 1136 states and 2029 transitions. [2021-11-07 00:57:02,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:02,783 INFO L276 IsEmpty]: Start isEmpty. Operand 1136 states and 2029 transitions. [2021-11-07 00:57:02,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-07 00:57:02,786 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:02,786 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:02,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:03,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:03,000 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:03,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:03,001 INFO L85 PathProgramCache]: Analyzing trace with hash 2137165750, now seen corresponding path program 1 times [2021-11-07 00:57:03,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:03,001 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1446929355] [2021-11-07 00:57:03,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:03,002 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:03,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:03,002 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:03,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 00:57:03,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:03,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:03,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:03,621 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 00:57:03,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:03,768 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 00:57:03,769 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:03,769 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1446929355] [2021-11-07 00:57:03,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1446929355] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:03,769 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:03,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:57:03,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271267815] [2021-11-07 00:57:03,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:03,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:03,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:03,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:03,771 INFO L87 Difference]: Start difference. First operand 1136 states and 2029 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:03,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:03,924 INFO L93 Difference]: Finished difference Result 3052 states and 5483 transitions. [2021-11-07 00:57:03,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:03,924 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2021-11-07 00:57:03,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:03,937 INFO L225 Difference]: With dead ends: 3052 [2021-11-07 00:57:03,938 INFO L226 Difference]: Without dead ends: 2012 [2021-11-07 00:57:03,939 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:03,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2012 states. [2021-11-07 00:57:04,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2012 to 1844. [2021-11-07 00:57:04,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1844 states, 1842 states have (on average 1.8023887079261671) internal successors, (3320), 1843 states have internal predecessors, (3320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:04,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1844 states to 1844 states and 3320 transitions. [2021-11-07 00:57:04,075 INFO L78 Accepts]: Start accepts. Automaton has 1844 states and 3320 transitions. Word has length 66 [2021-11-07 00:57:04,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:04,075 INFO L470 AbstractCegarLoop]: Abstraction has 1844 states and 3320 transitions. [2021-11-07 00:57:04,075 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:04,075 INFO L276 IsEmpty]: Start isEmpty. Operand 1844 states and 3320 transitions. [2021-11-07 00:57:04,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-07 00:57:04,084 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:04,084 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:04,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:04,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:04,299 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:04,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:04,299 INFO L85 PathProgramCache]: Analyzing trace with hash 1387474851, now seen corresponding path program 1 times [2021-11-07 00:57:04,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:04,300 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1696483811] [2021-11-07 00:57:04,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:04,301 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:04,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:04,302 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:04,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 00:57:04,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:04,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:04,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:04,969 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 00:57:04,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:05,126 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 00:57:05,126 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:05,127 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1696483811] [2021-11-07 00:57:05,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1696483811] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:05,127 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:05,127 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:57:05,127 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292840124] [2021-11-07 00:57:05,127 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:05,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:05,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:05,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:05,128 INFO L87 Difference]: Start difference. First operand 1844 states and 3320 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:05,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:05,334 INFO L93 Difference]: Finished difference Result 4912 states and 8875 transitions. [2021-11-07 00:57:05,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:05,335 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-07 00:57:05,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:05,357 INFO L225 Difference]: With dead ends: 4912 [2021-11-07 00:57:05,357 INFO L226 Difference]: Without dead ends: 3198 [2021-11-07 00:57:05,360 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:05,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3198 states. [2021-11-07 00:57:05,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3198 to 3030. [2021-11-07 00:57:05,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3030 states, 3028 states have (on average 1.808784676354029) internal successors, (5477), 3029 states have internal predecessors, (5477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:05,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3030 states to 3030 states and 5477 transitions. [2021-11-07 00:57:05,614 INFO L78 Accepts]: Start accepts. Automaton has 3030 states and 5477 transitions. Word has length 67 [2021-11-07 00:57:05,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:05,615 INFO L470 AbstractCegarLoop]: Abstraction has 3030 states and 5477 transitions. [2021-11-07 00:57:05,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 3 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:05,616 INFO L276 IsEmpty]: Start isEmpty. Operand 3030 states and 5477 transitions. [2021-11-07 00:57:05,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 00:57:05,620 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:05,620 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:05,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:05,834 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:05,834 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:05,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:05,835 INFO L85 PathProgramCache]: Analyzing trace with hash 1152348485, now seen corresponding path program 1 times [2021-11-07 00:57:05,835 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:05,836 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1606522822] [2021-11-07 00:57:05,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:05,836 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:05,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:05,837 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:05,838 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 00:57:06,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:06,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:06,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:06,536 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 00:57:06,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:06,692 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 00:57:06,692 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:06,692 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1606522822] [2021-11-07 00:57:06,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1606522822] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:06,693 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:06,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:57:06,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303194433] [2021-11-07 00:57:06,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:06,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:06,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:06,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:06,695 INFO L87 Difference]: Start difference. First operand 3030 states and 5477 transitions. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:07,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:07,061 INFO L93 Difference]: Finished difference Result 8186 states and 14829 transitions. [2021-11-07 00:57:07,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:07,062 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 00:57:07,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:07,094 INFO L225 Difference]: With dead ends: 8186 [2021-11-07 00:57:07,095 INFO L226 Difference]: Without dead ends: 5320 [2021-11-07 00:57:07,099 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:07,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5320 states. [2021-11-07 00:57:07,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5320 to 5152. [2021-11-07 00:57:07,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5152 states, 5150 states have (on average 1.810873786407767) internal successors, (9326), 5151 states have internal predecessors, (9326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:07,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5152 states to 5152 states and 9326 transitions. [2021-11-07 00:57:07,492 INFO L78 Accepts]: Start accepts. Automaton has 5152 states and 9326 transitions. Word has length 68 [2021-11-07 00:57:07,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:07,493 INFO L470 AbstractCegarLoop]: Abstraction has 5152 states and 9326 transitions. [2021-11-07 00:57:07,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:07,493 INFO L276 IsEmpty]: Start isEmpty. Operand 5152 states and 9326 transitions. [2021-11-07 00:57:07,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:57:07,500 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:07,501 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 00:57:07,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:07,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:07,717 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:07,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:07,717 INFO L85 PathProgramCache]: Analyzing trace with hash 1905699777, now seen corresponding path program 1 times [2021-11-07 00:57:07,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:07,718 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [129433733] [2021-11-07 00:57:07,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:07,718 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:07,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:07,721 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:07,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 00:57:08,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:08,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:08,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:08,499 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 00:57:08,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:08,720 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 00:57:08,720 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:08,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [129433733] [2021-11-07 00:57:08,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [129433733] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:08,721 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:08,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 00:57:08,721 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803056314] [2021-11-07 00:57:08,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:57:08,722 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:08,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:57:08,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 00:57:08,723 INFO L87 Difference]: Start difference. First operand 5152 states and 9326 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:11,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:11,867 INFO L93 Difference]: Finished difference Result 19260 states and 34906 transitions. [2021-11-07 00:57:11,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 00:57:11,868 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:57:11,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:11,928 INFO L225 Difference]: With dead ends: 19260 [2021-11-07 00:57:11,928 INFO L226 Difference]: Without dead ends: 14348 [2021-11-07 00:57:11,938 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:57:11,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14348 states. [2021-11-07 00:57:12,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14348 to 5102. [2021-11-07 00:57:12,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5102 states, 5100 states have (on average 1.7894117647058823) internal successors, (9126), 5101 states have internal predecessors, (9126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:12,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5102 states to 5102 states and 9126 transitions. [2021-11-07 00:57:12,495 INFO L78 Accepts]: Start accepts. Automaton has 5102 states and 9126 transitions. Word has length 69 [2021-11-07 00:57:12,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:12,495 INFO L470 AbstractCegarLoop]: Abstraction has 5102 states and 9126 transitions. [2021-11-07 00:57:12,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:12,495 INFO L276 IsEmpty]: Start isEmpty. Operand 5102 states and 9126 transitions. [2021-11-07 00:57:12,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 00:57:12,501 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:12,501 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:12,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:12,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:12,721 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:12,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:12,721 INFO L85 PathProgramCache]: Analyzing trace with hash 1008543506, now seen corresponding path program 1 times [2021-11-07 00:57:12,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:12,722 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [647659583] [2021-11-07 00:57:12,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:12,722 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:12,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:12,723 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:12,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 00:57:13,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:13,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:13,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:13,468 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 00:57:13,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:13,620 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 00:57:13,621 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:13,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [647659583] [2021-11-07 00:57:13,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [647659583] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:13,621 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:13,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 00:57:13,621 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470351189] [2021-11-07 00:57:13,622 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:13,622 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:13,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:13,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:13,623 INFO L87 Difference]: Start difference. First operand 5102 states and 9126 transitions. Second operand has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:14,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:14,210 INFO L93 Difference]: Finished difference Result 14863 states and 26630 transitions. [2021-11-07 00:57:14,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:14,211 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 00:57:14,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:14,242 INFO L225 Difference]: With dead ends: 14863 [2021-11-07 00:57:14,242 INFO L226 Difference]: Without dead ends: 9928 [2021-11-07 00:57:14,251 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 00:57:14,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9928 states. [2021-11-07 00:57:14,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9928 to 9760. [2021-11-07 00:57:14,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9760 states, 9758 states have (on average 1.7896085263373642) internal successors, (17463), 9759 states have internal predecessors, (17463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:14,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9760 states to 9760 states and 17463 transitions. [2021-11-07 00:57:14,929 INFO L78 Accepts]: Start accepts. Automaton has 9760 states and 17463 transitions. Word has length 69 [2021-11-07 00:57:14,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:14,929 INFO L470 AbstractCegarLoop]: Abstraction has 9760 states and 17463 transitions. [2021-11-07 00:57:14,929 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.0) internal successors, (69), 3 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:14,929 INFO L276 IsEmpty]: Start isEmpty. Operand 9760 states and 17463 transitions. [2021-11-07 00:57:14,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-07 00:57:14,936 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:14,936 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:14,951 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:15,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:15,152 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:15,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:15,152 INFO L85 PathProgramCache]: Analyzing trace with hash -1350824282, now seen corresponding path program 1 times [2021-11-07 00:57:15,153 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:15,153 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1762883851] [2021-11-07 00:57:15,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:15,153 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:15,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:15,154 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:15,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 00:57:15,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:15,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:15,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:15,948 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:57:15,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:16,137 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 00:57:16,137 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:16,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1762883851] [2021-11-07 00:57:16,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1762883851] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:16,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [976011642] [2021-11-07 00:57:16,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:16,138 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:16,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:16,145 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:16,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 00:57:16,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:16,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 00:57:16,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:17,247 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 00:57:17,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:17,440 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 00:57:17,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [976011642] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:17,441 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:17,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5] total 9 [2021-11-07 00:57:17,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190530534] [2021-11-07 00:57:17,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 00:57:17,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:17,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 00:57:17,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:57:17,442 INFO L87 Difference]: Start difference. First operand 9760 states and 17463 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:18,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:18,137 INFO L93 Difference]: Finished difference Result 9872 states and 17649 transitions. [2021-11-07 00:57:18,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 00:57:18,138 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-07 00:57:18,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:18,164 INFO L225 Difference]: With dead ends: 9872 [2021-11-07 00:57:18,164 INFO L226 Difference]: Without dead ends: 9754 [2021-11-07 00:57:18,169 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 269 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-07 00:57:18,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9754 states. [2021-11-07 00:57:18,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9754 to 9754. [2021-11-07 00:57:18,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9754 states, 9753 states have (on average 1.7896031990156875) internal successors, (17454), 9753 states have internal predecessors, (17454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:18,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9754 states to 9754 states and 17454 transitions. [2021-11-07 00:57:18,749 INFO L78 Accepts]: Start accepts. Automaton has 9754 states and 17454 transitions. Word has length 70 [2021-11-07 00:57:18,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:18,749 INFO L470 AbstractCegarLoop]: Abstraction has 9754 states and 17454 transitions. [2021-11-07 00:57:18,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 2 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:18,750 INFO L276 IsEmpty]: Start isEmpty. Operand 9754 states and 17454 transitions. [2021-11-07 00:57:18,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-07 00:57:18,771 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:18,772 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 00:57:18,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:18,989 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 00:57:19,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:19,187 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:19,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:19,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1119948527, now seen corresponding path program 1 times [2021-11-07 00:57:19,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:19,188 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1569134796] [2021-11-07 00:57:19,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:19,188 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:19,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:19,189 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:19,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 00:57:19,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:19,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:19,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:20,108 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 00:57:20,109 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:20,367 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 00:57:20,367 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:20,367 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1569134796] [2021-11-07 00:57:20,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1569134796] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:20,367 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1707492577] [2021-11-07 00:57:20,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:20,367 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:20,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:20,368 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:20,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 00:57:21,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:21,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 00:57:21,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:21,563 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 00:57:21,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:57:21,856 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1707492577] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:21,856 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:21,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 00:57:21,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459379810] [2021-11-07 00:57:21,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 00:57:21,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:21,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 00:57:21,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:57:21,858 INFO L87 Difference]: Start difference. First operand 9754 states and 17454 transitions. Second operand has 10 states, 10 states have (on average 14.1) internal successors, (141), 10 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:26,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:26,954 INFO L93 Difference]: Finished difference Result 57905 states and 104189 transitions. [2021-11-07 00:57:26,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 00:57:26,955 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 14.1) internal successors, (141), 10 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2021-11-07 00:57:26,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:27,107 INFO L225 Difference]: With dead ends: 57905 [2021-11-07 00:57:27,108 INFO L226 Difference]: Without dead ends: 57761 [2021-11-07 00:57:27,124 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 406 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 00:57:27,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57761 states. [2021-11-07 00:57:28,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57761 to 19456. [2021-11-07 00:57:28,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19456 states, 19455 states have (on average 1.7898740683628886) internal successors, (34822), 19455 states have internal predecessors, (34822), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:28,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19456 states to 19456 states and 34822 transitions. [2021-11-07 00:57:28,907 INFO L78 Accepts]: Start accepts. Automaton has 19456 states and 34822 transitions. Word has length 106 [2021-11-07 00:57:28,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:28,908 INFO L470 AbstractCegarLoop]: Abstraction has 19456 states and 34822 transitions. [2021-11-07 00:57:28,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 14.1) internal successors, (141), 10 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:28,908 INFO L276 IsEmpty]: Start isEmpty. Operand 19456 states and 34822 transitions. [2021-11-07 00:57:28,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 00:57:28,950 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:28,951 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 00:57:28,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:29,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Ended with exit code 0 [2021-11-07 00:57:29,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:29,356 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:29,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:29,357 INFO L85 PathProgramCache]: Analyzing trace with hash -395527460, now seen corresponding path program 1 times [2021-11-07 00:57:29,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:29,357 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [988990998] [2021-11-07 00:57:29,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:29,357 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:29,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:29,358 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:29,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 00:57:30,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:30,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 00:57:30,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:30,359 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 00:57:30,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:30,588 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 00:57:30,588 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:30,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [988990998] [2021-11-07 00:57:30,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [988990998] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:30,588 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 00:57:30,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 00:57:30,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792563618] [2021-11-07 00:57:30,589 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:57:30,589 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:30,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:57:30,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 00:57:30,590 INFO L87 Difference]: Start difference. First operand 19456 states and 34822 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:31,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:31,815 INFO L93 Difference]: Finished difference Result 38002 states and 68242 transitions. [2021-11-07 00:57:31,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:57:31,815 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 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 00:57:31,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:31,862 INFO L225 Difference]: With dead ends: 38002 [2021-11-07 00:57:31,862 INFO L226 Difference]: Without dead ends: 18789 [2021-11-07 00:57:31,883 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 210 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 00:57:31,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18789 states. [2021-11-07 00:57:32,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18789 to 9756. [2021-11-07 00:57:32,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9756 states, 9755 states have (on average 1.7891337775499743) internal successors, (17453), 9755 states have internal predecessors, (17453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:32,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9756 states to 9756 states and 17453 transitions. [2021-11-07 00:57:32,742 INFO L78 Accepts]: Start accepts. Automaton has 9756 states and 17453 transitions. Word has length 107 [2021-11-07 00:57:32,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:32,742 INFO L470 AbstractCegarLoop]: Abstraction has 9756 states and 17453 transitions. [2021-11-07 00:57:32,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:32,743 INFO L276 IsEmpty]: Start isEmpty. Operand 9756 states and 17453 transitions. [2021-11-07 00:57:32,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-07 00:57:32,761 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:32,762 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:32,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:32,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:57:32,979 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:32,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:32,979 INFO L85 PathProgramCache]: Analyzing trace with hash -1786561555, now seen corresponding path program 1 times [2021-11-07 00:57:32,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:32,980 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1597055222] [2021-11-07 00:57:32,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:32,980 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:32,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:32,981 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:32,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 00:57:33,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:33,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:33,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:34,011 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 00:57:34,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:34,260 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 00:57:34,260 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:34,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1597055222] [2021-11-07 00:57:34,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1597055222] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:34,260 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1064535723] [2021-11-07 00:57:34,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:34,261 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:34,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:34,261 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:34,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 00:57:35,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:35,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:57:35,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:35,625 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 00:57:35,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:35,881 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 00:57:35,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1064535723] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:35,881 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:35,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 00:57:35,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884714274] [2021-11-07 00:57:35,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:57:35,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:35,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:57:35,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:57:35,883 INFO L87 Difference]: Start difference. First operand 9756 states and 17453 transitions. Second operand has 5 states, 5 states have (on average 20.4) internal successors, (102), 5 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:38,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:57:38,441 INFO L93 Difference]: Finished difference Result 10007 states and 17870 transitions. [2021-11-07 00:57:38,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:57:38,441 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.4) internal successors, (102), 5 states have internal predecessors, (102), 0 states have call successors, (0), 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 108 [2021-11-07 00:57:38,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:57:38,453 INFO L225 Difference]: With dead ends: 10007 [2021-11-07 00:57:38,453 INFO L226 Difference]: Without dead ends: 9852 [2021-11-07 00:57:38,456 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 419 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 00:57:38,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9852 states. [2021-11-07 00:57:39,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9852 to 9752. [2021-11-07 00:57:39,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9752 states, 9751 states have (on average 1.7890472772023382) internal successors, (17445), 9751 states have internal predecessors, (17445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:39,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9752 states to 9752 states and 17445 transitions. [2021-11-07 00:57:39,301 INFO L78 Accepts]: Start accepts. Automaton has 9752 states and 17445 transitions. Word has length 108 [2021-11-07 00:57:39,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:57:39,301 INFO L470 AbstractCegarLoop]: Abstraction has 9752 states and 17445 transitions. [2021-11-07 00:57:39,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.4) internal successors, (102), 5 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:57:39,302 INFO L276 IsEmpty]: Start isEmpty. Operand 9752 states and 17445 transitions. [2021-11-07 00:57:39,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-07 00:57:39,316 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:57:39,316 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:57:39,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 00:57:39,549 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Ended with exit code 0 [2021-11-07 00:57:39,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:39,746 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:57:39,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:57:39,746 INFO L85 PathProgramCache]: Analyzing trace with hash 438128571, now seen corresponding path program 1 times [2021-11-07 00:57:39,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:57:39,747 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1969620408] [2021-11-07 00:57:39,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:39,747 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:57:39,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:57:39,748 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:57:39,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 00:57:40,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:40,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:57:40,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:40,966 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 00:57:40,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:41,240 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 00:57:41,240 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:57:41,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1969620408] [2021-11-07 00:57:41,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1969620408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:57:41,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2041329989] [2021-11-07 00:57:41,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:57:41,241 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:57:41,242 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:57:41,248 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:57:41,252 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 00:57:42,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:57:42,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:57:42,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:57:43,191 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 00:57:43,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:57:43,622 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 00:57:43,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2041329989] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:57:43,622 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:57:43,622 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:57:43,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692972985] [2021-11-07 00:57:43,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:57:43,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:57:43,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:57:43,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:57:43,624 INFO L87 Difference]: Start difference. First operand 9752 states and 17445 transitions. Second operand has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:01,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:01,578 INFO L93 Difference]: Finished difference Result 20304 states and 36182 transitions. [2021-11-07 00:58:01,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 00:58:01,579 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 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 110 [2021-11-07 00:58:01,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:01,602 INFO L225 Difference]: With dead ends: 20304 [2021-11-07 00:58:01,603 INFO L226 Difference]: Without dead ends: 20171 [2021-11-07 00:58:01,608 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 416 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=212, Invalid=718, Unknown=0, NotChecked=0, Total=930 [2021-11-07 00:58:01,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20171 states. [2021-11-07 00:58:02,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20171 to 19314. [2021-11-07 00:58:02,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19314 states, 19313 states have (on average 1.7904520271319837) internal successors, (34579), 19313 states have internal predecessors, (34579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:02,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19314 states to 19314 states and 34579 transitions. [2021-11-07 00:58:02,978 INFO L78 Accepts]: Start accepts. Automaton has 19314 states and 34579 transitions. Word has length 110 [2021-11-07 00:58:02,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:02,978 INFO L470 AbstractCegarLoop]: Abstraction has 19314 states and 34579 transitions. [2021-11-07 00:58:02,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.9375) internal successors, (159), 15 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:02,978 INFO L276 IsEmpty]: Start isEmpty. Operand 19314 states and 34579 transitions. [2021-11-07 00:58:02,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-11-07 00:58:03,000 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:03,000 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:03,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:03,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-07 00:58:03,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:03,401 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:03,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:03,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1096315674, now seen corresponding path program 1 times [2021-11-07 00:58:03,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:03,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1518681394] [2021-11-07 00:58:03,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:03,402 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:03,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:03,402 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:03,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 00:58:04,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:04,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:04,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:04,639 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 00:58:04,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:04,922 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 00:58:04,922 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:04,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1518681394] [2021-11-07 00:58:04,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1518681394] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:04,922 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1309453043] [2021-11-07 00:58:04,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:04,923 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:04,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:04,923 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:04,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 00:58:06,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:06,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:06,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:06,506 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 00:58:06,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:06,726 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:58:06,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1309453043] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:06,727 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:06,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 00:58:06,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499004503] [2021-11-07 00:58:06,727 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:58:06,727 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:06,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:58:06,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:58:06,728 INFO L87 Difference]: Start difference. First operand 19314 states and 34579 transitions. Second operand has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:07,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:07,690 INFO L93 Difference]: Finished difference Result 19470 states and 34836 transitions. [2021-11-07 00:58:07,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 00:58:07,690 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2021-11-07 00:58:07,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:07,711 INFO L225 Difference]: With dead ends: 19470 [2021-11-07 00:58:07,711 INFO L226 Difference]: Without dead ends: 19313 [2021-11-07 00:58:07,714 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 432 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:58:07,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19313 states. [2021-11-07 00:58:08,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19313 to 19313. [2021-11-07 00:58:08,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19313 states, 19312 states have (on average 1.790337613918807) internal successors, (34575), 19312 states have internal predecessors, (34575), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:08,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19313 states to 19313 states and 34575 transitions. [2021-11-07 00:58:08,701 INFO L78 Accepts]: Start accepts. Automaton has 19313 states and 34575 transitions. Word has length 111 [2021-11-07 00:58:08,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:08,701 INFO L470 AbstractCegarLoop]: Abstraction has 19313 states and 34575 transitions. [2021-11-07 00:58:08,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 26.25) internal successors, (105), 4 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:08,702 INFO L276 IsEmpty]: Start isEmpty. Operand 19313 states and 34575 transitions. [2021-11-07 00:58:08,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 00:58:08,720 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:08,721 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:08,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:08,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Ended with exit code 0 [2021-11-07 00:58:09,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:09,122 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:09,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:09,122 INFO L85 PathProgramCache]: Analyzing trace with hash -70507347, now seen corresponding path program 1 times [2021-11-07 00:58:09,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:09,123 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [27733836] [2021-11-07 00:58:09,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:09,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:09,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:09,124 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:09,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 00:58:10,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:10,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:10,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:10,441 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 00:58:10,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:10,697 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:58:10,697 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:10,697 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [27733836] [2021-11-07 00:58:10,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [27733836] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:10,698 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1101209064] [2021-11-07 00:58:10,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:10,698 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:10,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:10,699 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:10,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 00:58:12,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:12,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 00:58:12,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:12,796 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 00:58:12,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:13,232 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 00:58:13,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1101209064] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:13,232 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:13,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 00:58:13,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999990761] [2021-11-07 00:58:13,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 00:58:13,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:13,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 00:58:13,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 00:58:13,234 INFO L87 Difference]: Start difference. First operand 19313 states and 34575 transitions. Second operand has 16 states, 16 states have (on average 10.125) internal successors, (162), 15 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:29,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:29,874 INFO L93 Difference]: Finished difference Result 39648 states and 70789 transitions. [2021-11-07 00:58:29,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-07 00:58:29,875 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.125) internal successors, (162), 15 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-07 00:58:29,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:29,925 INFO L225 Difference]: With dead ends: 39648 [2021-11-07 00:58:29,925 INFO L226 Difference]: Without dead ends: 39412 [2021-11-07 00:58:29,931 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2021-11-07 00:58:29,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39412 states. [2021-11-07 00:58:31,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39412 to 38356. [2021-11-07 00:58:31,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38356 states, 38355 states have (on average 1.7911354451831574) internal successors, (68699), 38355 states have internal predecessors, (68699), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:32,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38356 states to 38356 states and 68699 transitions. [2021-11-07 00:58:32,020 INFO L78 Accepts]: Start accepts. Automaton has 38356 states and 68699 transitions. Word has length 112 [2021-11-07 00:58:32,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:32,021 INFO L470 AbstractCegarLoop]: Abstraction has 38356 states and 68699 transitions. [2021-11-07 00:58:32,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.125) internal successors, (162), 15 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:32,021 INFO L276 IsEmpty]: Start isEmpty. Operand 38356 states and 68699 transitions. [2021-11-07 00:58:32,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 00:58:32,076 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:32,077 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:32,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:32,295 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:32,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:32,483 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:32,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:32,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1609067825, now seen corresponding path program 1 times [2021-11-07 00:58:32,484 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:32,485 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1008726790] [2021-11-07 00:58:32,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:32,485 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:32,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:32,486 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:32,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 00:58:33,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:33,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:33,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:33,920 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 00:58:33,921 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:34,187 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 00:58:34,187 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:34,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1008726790] [2021-11-07 00:58:34,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1008726790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:34,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [504624028] [2021-11-07 00:58:34,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:34,187 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:34,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:34,188 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:34,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 00:58:35,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:35,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 00:58:35,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:36,170 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 00:58:36,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:36,643 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 00:58:36,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [504624028] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:36,644 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:36,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-07 00:58:36,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384924575] [2021-11-07 00:58:36,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 00:58:36,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:36,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 00:58:36,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-07 00:58:36,645 INFO L87 Difference]: Start difference. First operand 38356 states and 68699 transitions. Second operand has 14 states, 14 states have (on average 12.0) internal successors, (168), 14 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:43,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:43,451 INFO L93 Difference]: Finished difference Result 40714 states and 72588 transitions. [2021-11-07 00:58:43,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 00:58:43,453 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 12.0) internal successors, (168), 14 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-07 00:58:43,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:43,505 INFO L225 Difference]: With dead ends: 40714 [2021-11-07 00:58:43,505 INFO L226 Difference]: Without dead ends: 40371 [2021-11-07 00:58:43,511 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 427 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=253, Invalid=803, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 00:58:43,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40371 states. [2021-11-07 00:58:45,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40371 to 38376. [2021-11-07 00:58:45,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38376 states, 38375 states have (on average 1.7907231270358306) internal successors, (68719), 38375 states have internal predecessors, (68719), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38376 states to 38376 states and 68719 transitions. [2021-11-07 00:58:46,038 INFO L78 Accepts]: Start accepts. Automaton has 38376 states and 68719 transitions. Word has length 112 [2021-11-07 00:58:46,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:46,039 INFO L470 AbstractCegarLoop]: Abstraction has 38376 states and 68719 transitions. [2021-11-07 00:58:46,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 12.0) internal successors, (168), 14 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:46,039 INFO L276 IsEmpty]: Start isEmpty. Operand 38376 states and 68719 transitions. [2021-11-07 00:58:46,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 00:58:46,068 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:46,068 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:46,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:46,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:46,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:58:46,470 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:46,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:46,470 INFO L85 PathProgramCache]: Analyzing trace with hash -741237008, now seen corresponding path program 1 times [2021-11-07 00:58:46,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:46,471 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [92606419] [2021-11-07 00:58:46,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:46,471 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:46,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:46,480 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:46,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 00:58:47,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:47,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:47,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:48,128 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 00:58:48,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:48,402 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 00:58:48,402 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:48,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [92606419] [2021-11-07 00:58:48,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [92606419] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:48,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1654710389] [2021-11-07 00:58:48,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:48,403 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:48,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:48,405 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:48,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 00:58:50,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:50,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 00:58:50,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:50,475 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 00:58:50,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:50,860 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 00:58:50,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1654710389] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:58:50,860 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:58:50,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 00:58:50,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066348512] [2021-11-07 00:58:50,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 00:58:50,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:58:50,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 00:58:50,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:58:50,862 INFO L87 Difference]: Start difference. First operand 38376 states and 68719 transitions. Second operand has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:53,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:58:53,314 INFO L93 Difference]: Finished difference Result 40294 states and 71797 transitions. [2021-11-07 00:58:53,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 00:58:53,315 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-07 00:58:53,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:58:53,367 INFO L225 Difference]: With dead ends: 40294 [2021-11-07 00:58:53,367 INFO L226 Difference]: Without dead ends: 40051 [2021-11-07 00:58:53,375 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:58:53,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40051 states. [2021-11-07 00:58:55,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40051 to 38560. [2021-11-07 00:58:55,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38560 states, 38559 states have (on average 1.789647034414793) internal successors, (69007), 38559 states have internal predecessors, (69007), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:55,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38560 states to 38560 states and 69007 transitions. [2021-11-07 00:58:55,837 INFO L78 Accepts]: Start accepts. Automaton has 38560 states and 69007 transitions. Word has length 113 [2021-11-07 00:58:55,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:58:55,837 INFO L470 AbstractCegarLoop]: Abstraction has 38560 states and 69007 transitions. [2021-11-07 00:58:55,838 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.4) internal successors, (107), 4 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:58:55,838 INFO L276 IsEmpty]: Start isEmpty. Operand 38560 states and 69007 transitions. [2021-11-07 00:58:55,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 00:58:55,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:58:55,872 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:58:55,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:56,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 00:58:56,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:56,273 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:58:56,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:58:56,273 INFO L85 PathProgramCache]: Analyzing trace with hash 617468053, now seen corresponding path program 1 times [2021-11-07 00:58:56,274 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:58:56,274 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1632097510] [2021-11-07 00:58:56,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:56,274 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:58:56,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:58:56,275 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:58:56,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 00:58:57,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:58:57,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:58:57,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:58:57,967 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 00:58:57,967 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:58:58,295 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 00:58:58,295 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:58:58,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1632097510] [2021-11-07 00:58:58,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1632097510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:58:58,295 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [743384699] [2021-11-07 00:58:58,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:58:58,296 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:58:58,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:58:58,301 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:58:58,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 00:59:00,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:00,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 00:59:00,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:00,503 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:00,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:00,755 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:00,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [743384699] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:00,756 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:00,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [5, 5] total 15 [2021-11-07 00:59:00,760 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141156958] [2021-11-07 00:59:00,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 00:59:00,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:00,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 00:59:00,762 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-11-07 00:59:00,763 INFO L87 Difference]: Start difference. First operand 38560 states and 69007 transitions. Second operand has 9 states, 9 states have (on average 12.666666666666666) internal successors, (114), 9 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:03,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:03,666 INFO L93 Difference]: Finished difference Result 39049 states and 69771 transitions. [2021-11-07 00:59:03,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:59:03,676 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 12.666666666666666) internal successors, (114), 9 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-07 00:59:03,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:03,732 INFO L225 Difference]: With dead ends: 39049 [2021-11-07 00:59:03,732 INFO L226 Difference]: Without dead ends: 38926 [2021-11-07 00:59:03,739 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 439 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-11-07 00:59:03,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38926 states. [2021-11-07 00:59:06,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38926 to 38568. [2021-11-07 00:59:06,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38568 states, 38567 states have (on average 1.789483236964244) internal successors, (69015), 38567 states have internal predecessors, (69015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:06,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38568 states to 38568 states and 69015 transitions. [2021-11-07 00:59:06,692 INFO L78 Accepts]: Start accepts. Automaton has 38568 states and 69015 transitions. Word has length 114 [2021-11-07 00:59:06,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:06,692 INFO L470 AbstractCegarLoop]: Abstraction has 38568 states and 69015 transitions. [2021-11-07 00:59:06,693 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 12.666666666666666) internal successors, (114), 9 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:06,693 INFO L276 IsEmpty]: Start isEmpty. Operand 38568 states and 69015 transitions. [2021-11-07 00:59:06,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 00:59:06,735 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:06,735 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:06,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:06,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:07,136 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:07,136 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:07,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:07,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1424357264, now seen corresponding path program 1 times [2021-11-07 00:59:07,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:07,137 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [169036416] [2021-11-07 00:59:07,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:07,137 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:07,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:07,138 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:07,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-07 00:59:08,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:08,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:08,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:08,938 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:08,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:09,257 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:09,257 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:09,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [169036416] [2021-11-07 00:59:09,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [169036416] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:09,257 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [564583872] [2021-11-07 00:59:09,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:09,258 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:09,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:09,259 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:09,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-07 00:59:11,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:11,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-07 00:59:11,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:11,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:12,027 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:12,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [564583872] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:12,027 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:12,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 16 [2021-11-07 00:59:12,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962205381] [2021-11-07 00:59:12,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 00:59:12,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:12,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 00:59:12,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-07 00:59:12,029 INFO L87 Difference]: Start difference. First operand 38568 states and 69015 transitions. Second operand has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:15,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:15,185 INFO L93 Difference]: Finished difference Result 39099 states and 69838 transitions. [2021-11-07 00:59:15,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 00:59:15,186 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 states have internal predecessors, (108), 0 states have call successors, (0), 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 114 [2021-11-07 00:59:15,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:15,244 INFO L225 Difference]: With dead ends: 39099 [2021-11-07 00:59:15,244 INFO L226 Difference]: Without dead ends: 38688 [2021-11-07 00:59:15,250 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=178, Invalid=634, Unknown=0, NotChecked=0, Total=812 [2021-11-07 00:59:15,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38688 states. [2021-11-07 00:59:18,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38688 to 38556. [2021-11-07 00:59:18,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38556 states, 38555 states have (on average 1.7890027233821812) internal successors, (68975), 38555 states have internal predecessors, (68975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:18,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38556 states to 38556 states and 68975 transitions. [2021-11-07 00:59:18,212 INFO L78 Accepts]: Start accepts. Automaton has 38556 states and 68975 transitions. Word has length 114 [2021-11-07 00:59:18,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:18,213 INFO L470 AbstractCegarLoop]: Abstraction has 38556 states and 68975 transitions. [2021-11-07 00:59:18,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 10.8) internal successors, (108), 10 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:18,213 INFO L276 IsEmpty]: Start isEmpty. Operand 38556 states and 68975 transitions. [2021-11-07 00:59:18,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 00:59:18,262 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:18,262 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:18,273 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (36)] Ended with exit code 0 [2021-11-07 00:59:18,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (35)] Ended with exit code 0 [2021-11-07 00:59:18,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:18,665 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:18,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:18,665 INFO L85 PathProgramCache]: Analyzing trace with hash 455420150, now seen corresponding path program 1 times [2021-11-07 00:59:18,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:18,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [928649134] [2021-11-07 00:59:18,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:18,666 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:18,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:18,667 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:18,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-07 00:59:20,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:20,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:20,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:20,579 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:20,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:20,883 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:20,883 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:20,883 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [928649134] [2021-11-07 00:59:20,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [928649134] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:20,884 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [227535174] [2021-11-07 00:59:20,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:20,884 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:20,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:20,885 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:20,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-07 00:59:23,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:23,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 00:59:23,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:23,352 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 00:59:23,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:23,569 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:23,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [227535174] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:23,570 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:23,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 00:59:23,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425181250] [2021-11-07 00:59:23,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 00:59:23,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:23,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 00:59:23,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-07 00:59:23,571 INFO L87 Difference]: Start difference. First operand 38556 states and 68975 transitions. Second operand has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:26,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:26,485 INFO L93 Difference]: Finished difference Result 40156 states and 71438 transitions. [2021-11-07 00:59:26,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 00:59:26,485 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 00:59:26,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:26,545 INFO L225 Difference]: With dead ends: 40156 [2021-11-07 00:59:26,545 INFO L226 Difference]: Without dead ends: 39521 [2021-11-07 00:59:26,554 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 452 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-07 00:59:26,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39521 states. [2021-11-07 00:59:29,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39521 to 38566. [2021-11-07 00:59:29,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38566 states, 38565 states have (on average 1.7887981330221703) internal successors, (68985), 38565 states have internal predecessors, (68985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:29,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38566 states to 38566 states and 68985 transitions. [2021-11-07 00:59:29,132 INFO L78 Accepts]: Start accepts. Automaton has 38566 states and 68985 transitions. Word has length 116 [2021-11-07 00:59:29,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:29,132 INFO L470 AbstractCegarLoop]: Abstraction has 38566 states and 68985 transitions. [2021-11-07 00:59:29,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.5) internal successors, (110), 4 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:29,133 INFO L276 IsEmpty]: Start isEmpty. Operand 38566 states and 68985 transitions. [2021-11-07 00:59:29,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 00:59:29,179 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:29,179 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:29,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:29,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:29,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:29,580 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:29,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:29,580 INFO L85 PathProgramCache]: Analyzing trace with hash 886537152, now seen corresponding path program 1 times [2021-11-07 00:59:29,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:29,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1986862833] [2021-11-07 00:59:29,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:29,582 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:29,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:29,583 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:29,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 00:59:31,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:31,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:31,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:31,572 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:31,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:31,907 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:31,907 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:31,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1986862833] [2021-11-07 00:59:31,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1986862833] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:31,907 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1199727418] [2021-11-07 00:59:31,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:31,907 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:31,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:31,909 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:31,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 00:59:34,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:34,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 00:59:34,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:34,710 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:34,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:35,107 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:35,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1199727418] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:35,107 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:35,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 00:59:35,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344929487] [2021-11-07 00:59:35,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 00:59:35,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:35,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 00:59:35,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 00:59:35,109 INFO L87 Difference]: Start difference. First operand 38566 states and 68985 transitions. Second operand has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:39,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:39,984 INFO L93 Difference]: Finished difference Result 39372 states and 70232 transitions. [2021-11-07 00:59:39,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 00:59:39,985 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 00:59:39,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:40,045 INFO L225 Difference]: With dead ends: 39372 [2021-11-07 00:59:40,046 INFO L226 Difference]: Without dead ends: 38695 [2021-11-07 00:59:40,054 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 449 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 00:59:40,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38695 states. [2021-11-07 00:59:42,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38695 to 38542. [2021-11-07 00:59:42,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38542 states, 38541 states have (on average 1.788484990010638) internal successors, (68930), 38541 states have internal predecessors, (68930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:42,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38542 states to 38542 states and 68930 transitions. [2021-11-07 00:59:42,884 INFO L78 Accepts]: Start accepts. Automaton has 38542 states and 68930 transitions. Word has length 116 [2021-11-07 00:59:42,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:42,884 INFO L470 AbstractCegarLoop]: Abstraction has 38542 states and 68930 transitions. [2021-11-07 00:59:42,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 15.714285714285714) internal successors, (110), 7 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:42,885 INFO L276 IsEmpty]: Start isEmpty. Operand 38542 states and 68930 transitions. [2021-11-07 00:59:42,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-07 00:59:42,933 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:42,934 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:42,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:43,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:43,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:43,334 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:43,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:43,335 INFO L85 PathProgramCache]: Analyzing trace with hash 1891784663, now seen corresponding path program 1 times [2021-11-07 00:59:43,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:43,335 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2141125351] [2021-11-07 00:59:43,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:43,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:43,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:43,336 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:43,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-07 00:59:45,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:45,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:45,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:45,423 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:45,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:45,766 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:45,767 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:45,767 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2141125351] [2021-11-07 00:59:45,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2141125351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:45,767 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [512891456] [2021-11-07 00:59:45,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:45,767 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:45,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:45,779 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:45,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-07 00:59:48,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:48,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 00:59:48,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:48,565 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:48,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:48,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 00:59:48,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [512891456] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 00:59:48,820 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 00:59:48,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 00:59:48,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061524761] [2021-11-07 00:59:48,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 00:59:48,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 00:59:48,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 00:59:48,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 00:59:48,822 INFO L87 Difference]: Start difference. First operand 38542 states and 68930 transitions. Second operand has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:51,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 00:59:51,839 INFO L93 Difference]: Finished difference Result 39551 states and 70504 transitions. [2021-11-07 00:59:51,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 00:59:51,840 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2021-11-07 00:59:51,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 00:59:51,913 INFO L225 Difference]: With dead ends: 39551 [2021-11-07 00:59:51,913 INFO L226 Difference]: Without dead ends: 38878 [2021-11-07 00:59:51,921 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 450 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 00:59:51,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38878 states. [2021-11-07 00:59:54,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38878 to 38482. [2021-11-07 00:59:54,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38482 states, 38481 states have (on average 1.7887009173358281) internal successors, (68831), 38481 states have internal predecessors, (68831), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:54,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38482 states to 38482 states and 68831 transitions. [2021-11-07 00:59:54,659 INFO L78 Accepts]: Start accepts. Automaton has 38482 states and 68831 transitions. Word has length 116 [2021-11-07 00:59:54,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 00:59:54,659 INFO L470 AbstractCegarLoop]: Abstraction has 38482 states and 68831 transitions. [2021-11-07 00:59:54,660 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.333333333333332) internal successors, (110), 6 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 00:59:54,660 INFO L276 IsEmpty]: Start isEmpty. Operand 38482 states and 68831 transitions. [2021-11-07 00:59:54,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 00:59:54,705 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 00:59:54,705 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 00:59:54,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (42)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:54,929 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-07 00:59:55,109 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 00:59:55,109 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 00:59:55,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 00:59:55,109 INFO L85 PathProgramCache]: Analyzing trace with hash -1645659547, now seen corresponding path program 1 times [2021-11-07 00:59:55,110 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 00:59:55,110 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [403615627] [2021-11-07 00:59:55,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:55,110 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 00:59:55,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 00:59:55,111 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 00:59:55,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-07 00:59:57,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 00:59:57,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 00:59:57,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 00:59:57,399 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:57,399 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 00:59:57,722 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 00:59:57,722 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 00:59:57,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [403615627] [2021-11-07 00:59:57,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [403615627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 00:59:57,722 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [194344911] [2021-11-07 00:59:57,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 00:59:57,723 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 00:59:57,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 00:59:57,723 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 00:59:57,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-07 01:00:00,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:00,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 01:00:00,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:00,753 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:00,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:01,099 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:01,099 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [194344911] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:01,099 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:01,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [5, 5] total 17 [2021-11-07 01:00:01,100 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748640915] [2021-11-07 01:00:01,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:00:01,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:01,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:00:01,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:00:01,102 INFO L87 Difference]: Start difference. First operand 38482 states and 68831 transitions. Second operand has 11 states, 11 states have (on average 13.636363636363637) internal successors, (150), 11 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:06,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:06,232 INFO L93 Difference]: Finished difference Result 39730 states and 70750 transitions. [2021-11-07 01:00:06,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:00:06,233 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 13.636363636363637) internal successors, (150), 11 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-07 01:00:06,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:06,294 INFO L225 Difference]: With dead ends: 39730 [2021-11-07 01:00:06,294 INFO L226 Difference]: Without dead ends: 39605 [2021-11-07 01:00:06,303 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2021-11-07 01:00:06,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39605 states. [2021-11-07 01:00:09,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39605 to 38901. [2021-11-07 01:00:09,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38901 states, 38900 states have (on average 1.7853984575835475) internal successors, (69452), 38900 states have internal predecessors, (69452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:09,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38901 states to 38901 states and 69452 transitions. [2021-11-07 01:00:09,170 INFO L78 Accepts]: Start accepts. Automaton has 38901 states and 69452 transitions. Word has length 117 [2021-11-07 01:00:09,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:09,170 INFO L470 AbstractCegarLoop]: Abstraction has 38901 states and 69452 transitions. [2021-11-07 01:00:09,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 13.636363636363637) internal successors, (150), 11 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:09,171 INFO L276 IsEmpty]: Start isEmpty. Operand 38901 states and 69452 transitions. [2021-11-07 01:00:09,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 01:00:09,217 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:09,217 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:09,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:09,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:09,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:09,618 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:09,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:09,619 INFO L85 PathProgramCache]: Analyzing trace with hash 67925737, now seen corresponding path program 1 times [2021-11-07 01:00:09,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:09,619 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1894894425] [2021-11-07 01:00:09,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:09,620 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:09,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:09,621 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:09,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-07 01:00:11,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:11,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:11,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:12,224 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:12,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:12,603 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:12,603 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:12,603 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1894894425] [2021-11-07 01:00:12,604 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1894894425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:12,604 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [655362915] [2021-11-07 01:00:12,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:12,604 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:12,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:12,606 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:12,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-07 01:00:15,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:15,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 01:00:15,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:15,985 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:15,985 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:16,259 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:16,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [655362915] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:16,259 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:16,259 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11, 11] imperfect sequences [5, 5] total 17 [2021-11-07 01:00:16,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151849080] [2021-11-07 01:00:16,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-07 01:00:16,260 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:16,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-07 01:00:16,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:00:16,261 INFO L87 Difference]: Start difference. First operand 38901 states and 69452 transitions. Second operand has 11 states, 11 states have (on average 10.181818181818182) internal successors, (112), 11 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:19,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:19,391 INFO L93 Difference]: Finished difference Result 39255 states and 70008 transitions. [2021-11-07 01:00:19,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-07 01:00:19,391 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 10.181818181818182) internal successors, (112), 11 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-07 01:00:19,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:19,454 INFO L225 Difference]: With dead ends: 39255 [2021-11-07 01:00:19,454 INFO L226 Difference]: Without dead ends: 39022 [2021-11-07 01:00:19,463 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 453 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=233, Invalid=823, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 01:00:19,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39022 states. [2021-11-07 01:00:22,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39022 to 38897. [2021-11-07 01:00:22,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38897 states, 38896 states have (on average 1.7851707116412998) internal successors, (69436), 38896 states have internal predecessors, (69436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:22,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38897 states to 38897 states and 69436 transitions. [2021-11-07 01:00:22,304 INFO L78 Accepts]: Start accepts. Automaton has 38897 states and 69436 transitions. Word has length 118 [2021-11-07 01:00:22,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:22,305 INFO L470 AbstractCegarLoop]: Abstraction has 38897 states and 69436 transitions. [2021-11-07 01:00:22,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 10.181818181818182) internal successors, (112), 11 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:22,305 INFO L276 IsEmpty]: Start isEmpty. Operand 38897 states and 69436 transitions. [2021-11-07 01:00:22,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 01:00:22,560 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:22,561 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:22,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:22,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:22,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:22,962 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:22,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:22,962 INFO L85 PathProgramCache]: Analyzing trace with hash 1713162087, now seen corresponding path program 1 times [2021-11-07 01:00:22,963 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:22,963 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2116381235] [2021-11-07 01:00:22,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:22,963 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:22,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:22,965 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:22,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-07 01:00:25,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:25,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:00:25,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:25,381 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:25,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:25,764 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:00:25,765 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:25,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2116381235] [2021-11-07 01:00:25,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2116381235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:00:25,765 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [295763405] [2021-11-07 01:00:25,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:25,766 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:00:25,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:00:25,773 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:00:25,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-07 01:00:28,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:28,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-07 01:00:28,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:29,103 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:29,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:29,351 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:00:29,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [295763405] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:29,352 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:00:29,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-07 01:00:29,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518912485] [2021-11-07 01:00:29,356 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:29,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:29,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:29,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:00:29,358 INFO L87 Difference]: Start difference. First operand 38897 states and 69436 transitions. Second operand has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:31,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:00:31,785 INFO L93 Difference]: Finished difference Result 39183 states and 69896 transitions. [2021-11-07 01:00:31,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:00:31,785 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-07 01:00:31,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:00:31,848 INFO L225 Difference]: With dead ends: 39183 [2021-11-07 01:00:31,848 INFO L226 Difference]: Without dead ends: 38539 [2021-11-07 01:00:31,858 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 458 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:00:31,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38539 states. [2021-11-07 01:00:34,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38539 to 38474. [2021-11-07 01:00:34,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38474 states, 38473 states have (on average 1.7883450731681958) internal successors, (68803), 38473 states have internal predecessors, (68803), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:34,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38474 states to 38474 states and 68803 transitions. [2021-11-07 01:00:34,649 INFO L78 Accepts]: Start accepts. Automaton has 38474 states and 68803 transitions. Word has length 118 [2021-11-07 01:00:34,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:00:34,650 INFO L470 AbstractCegarLoop]: Abstraction has 38474 states and 68803 transitions. [2021-11-07 01:00:34,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.666666666666668) internal successors, (112), 6 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:00:34,650 INFO L276 IsEmpty]: Start isEmpty. Operand 38474 states and 68803 transitions. [2021-11-07 01:00:34,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-07 01:00:34,699 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:00:34,699 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:00:34,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:34,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-07 01:00:35,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:00:35,101 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:00:35,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:00:35,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1861913891, now seen corresponding path program 1 times [2021-11-07 01:00:35,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:00:35,102 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1062259624] [2021-11-07 01:00:35,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:00:35,102 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:00:35,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:00:35,104 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:00:35,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09bf6478-bf95-4c7e-be9d-30ab29e47aa8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-07 01:00:37,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:00:37,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:00:37,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:00:37,676 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:00:37,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:00:38,018 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:00:38,019 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:00:38,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1062259624] [2021-11-07 01:00:38,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1062259624] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:00:38,019 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:00:38,019 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 01:00:38,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593145215] [2021-11-07 01:00:38,020 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:00:38,020 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:00:38,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:00:38,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:00:38,021 INFO L87 Difference]: Start difference. First operand 38474 states and 68803 transitions. Second operand has 6 states, 6 states have (on average 24.5) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)