./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/email_spec7_product31.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec7_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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 77705a63487ad2667abe7e61d03fbac9d343255168bc183f3ebec6cdcc7d3824 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:02:54,423 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:02:54,425 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:02:54,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:02:54,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:02:54,466 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:02:54,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:02:54,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:02:54,473 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:02:54,474 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:02:54,475 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:02:54,477 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:02:54,477 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:02:54,479 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:02:54,480 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:02:54,482 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:02:54,483 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:02:54,484 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:02:54,486 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:02:54,489 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:02:54,491 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:02:54,493 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:02:54,494 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:02:54,495 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:02:54,499 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:02:54,500 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:02:54,500 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:02:54,501 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:02:54,502 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:02:54,503 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:02:54,508 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:02:54,509 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:02:54,512 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:02:54,513 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:02:54,517 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:02:54,517 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:02:54,518 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:02:54,518 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:02:54,518 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:02:54,520 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:02:54,520 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:02:54,522 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 02:02:54,570 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:02:54,570 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:02:54,572 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:02:54,572 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:02:54,572 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:02:54,573 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:02:54,573 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 02:02:54,573 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:02:54,579 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:02:54,580 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 02:02:54,581 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 02:02:54,581 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:02:54,581 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 02:02:54,582 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 02:02:54,582 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 02:02:54,583 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:02:54,583 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:02:54,583 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 02:02:54,583 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:02:54,584 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:02:54,584 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:02:54,584 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:02:54,584 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:02:54,585 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:02:54,585 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:02:54,585 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:02:54,585 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:02:54,586 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:02:54,586 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:02:54,587 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:02:54,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:02:54,588 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:02:54,588 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:02:54,589 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:02:54,589 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 02:02:54,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 02:02:54,589 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:02:54,590 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:02:54,590 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:02:54,590 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 77705a63487ad2667abe7e61d03fbac9d343255168bc183f3ebec6cdcc7d3824 [2021-11-07 02:02:54,930 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:02:54,968 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:02:54,971 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:02:54,972 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:02:54,974 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:02:54,975 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec7_product31.cil.c [2021-11-07 02:02:55,074 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/5cc11b205/5b51912989b448bfbdc9d1eb0e8b6609/FLAG3dc6d94fb [2021-11-07 02:02:55,822 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:02:55,832 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/sv-benchmarks/c/product-lines/email_spec7_product31.cil.c [2021-11-07 02:02:55,856 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/5cc11b205/5b51912989b448bfbdc9d1eb0e8b6609/FLAG3dc6d94fb [2021-11-07 02:02:55,974 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/5cc11b205/5b51912989b448bfbdc9d1eb0e8b6609 [2021-11-07 02:02:55,984 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:02:55,987 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:02:55,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:02:55,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:02:55,995 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:02:55,997 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:02:55" (1/1) ... [2021-11-07 02:02:55,998 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@708833b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:55, skipping insertion in model container [2021-11-07 02:02:55,998 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:02:55" (1/1) ... [2021-11-07 02:02:56,007 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:02:56,122 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:02:56,572 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/sv-benchmarks/c/product-lines/email_spec7_product31.cil.c[7290,7303] [2021-11-07 02:02:56,969 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:02:56,991 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 02:02:56,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@625513d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:02:56, skipping insertion in model container [2021-11-07 02:02:56,992 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:02:56,993 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 02:02:56,996 INFO L168 Benchmark]: Toolchain (without parser) took 1007.41 ms. Allocated memory is still 107.0 MB. Free memory was 66.2 MB in the beginning and 67.7 MB in the end (delta: -1.5 MB). Peak memory consumption was 10.8 MB. Max. memory is 16.1 GB. [2021-11-07 02:02:56,998 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 107.0 MB. Free memory was 85.6 MB in the beginning and 85.5 MB in the end (delta: 64.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:02:57,001 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1003.00 ms. Allocated memory is still 107.0 MB. Free memory was 66.0 MB in the beginning and 67.7 MB in the end (delta: -1.7 MB). Peak memory consumption was 10.8 MB. Max. memory is 16.1 GB. [2021-11-07 02:02:57,004 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 107.0 MB. Free memory was 85.6 MB in the beginning and 85.5 MB in the end (delta: 64.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 1003.00 ms. Allocated memory is still 107.0 MB. Free memory was 66.0 MB in the beginning and 67.7 MB in the end (delta: -1.7 MB). Peak memory consumption was 10.8 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 1192]: 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/email_spec7_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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 77705a63487ad2667abe7e61d03fbac9d343255168bc183f3ebec6cdcc7d3824 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:02:59,712 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:02:59,715 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:02:59,769 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:02:59,770 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:02:59,776 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:02:59,778 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:02:59,788 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:02:59,793 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:02:59,803 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:02:59,804 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:02:59,807 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:02:59,808 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:02:59,812 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:02:59,815 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:02:59,821 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:02:59,823 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:02:59,826 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:02:59,828 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:02:59,839 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:02:59,841 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:02:59,843 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:02:59,846 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:02:59,850 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:02:59,862 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:02:59,863 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:02:59,863 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:02:59,866 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:02:59,867 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:02:59,868 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:02:59,870 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:02:59,871 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:02:59,874 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:02:59,875 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:02:59,877 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:02:59,899 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:02:59,900 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:02:59,901 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:02:59,901 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:02:59,904 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:02:59,905 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:02:59,906 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 02:02:59,974 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:02:59,974 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:02:59,977 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:02:59,977 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:02:59,978 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:02:59,978 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:02:59,979 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:02:59,979 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:02:59,979 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:02:59,981 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:02:59,983 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:02:59,983 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:02:59,984 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:02:59,984 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:02:59,984 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:02:59,985 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:02:59,985 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:02:59,985 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:02:59,985 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:02:59,986 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:02:59,986 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:02:59,986 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:02:59,987 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:02:59,987 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:02:59,987 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:02:59,988 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:02:59,988 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:02:59,988 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:02:59,989 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:02:59,989 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:02:59,989 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:02:59,989 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:02:59,990 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:02:59,990 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:02:59,991 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:02:59,991 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 77705a63487ad2667abe7e61d03fbac9d343255168bc183f3ebec6cdcc7d3824 [2021-11-07 02:03:00,506 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:03:00,552 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:03:00,555 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:03:00,557 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:03:00,560 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:03:00,561 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/product-lines/email_spec7_product31.cil.c [2021-11-07 02:03:00,646 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/f97ed3469/32b1914931a8411baec74bb42fee8426/FLAG2eaeedbde [2021-11-07 02:03:01,427 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:03:01,428 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/sv-benchmarks/c/product-lines/email_spec7_product31.cil.c [2021-11-07 02:03:01,458 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/f97ed3469/32b1914931a8411baec74bb42fee8426/FLAG2eaeedbde [2021-11-07 02:03:01,582 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/data/f97ed3469/32b1914931a8411baec74bb42fee8426 [2021-11-07 02:03:01,586 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:03:01,587 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:03:01,595 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:03:01,595 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:03:01,600 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:03:01,602 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:03:01" (1/1) ... [2021-11-07 02:03:01,604 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6be2b6d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:01, skipping insertion in model container [2021-11-07 02:03:01,604 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:03:01" (1/1) ... [2021-11-07 02:03:01,615 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:03:01,764 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:03:02,066 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/sv-benchmarks/c/product-lines/email_spec7_product31.cil.c[7290,7303] [2021-11-07 02:03:02,418 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:03:02,450 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 02:03:02,470 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:03:02,509 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/sv-benchmarks/c/product-lines/email_spec7_product31.cil.c[7290,7303] [2021-11-07 02:03:02,645 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:03:02,653 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:03:02,678 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_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/sv-benchmarks/c/product-lines/email_spec7_product31.cil.c[7290,7303] [2021-11-07 02:03:02,751 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:03:02,797 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:03:02,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02 WrapperNode [2021-11-07 02:03:02,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:03:02,799 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:03:02,799 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:03:02,799 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:03:02,808 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:02,851 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:02,996 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:03:02,997 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:03:02,997 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:03:02,998 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:03:03,008 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,009 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,023 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,024 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,096 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,158 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,185 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,227 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:03:03,228 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:03:03,228 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:03:03,228 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:03:03,229 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (1/1) ... [2021-11-07 02:03:03,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:03:03,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:03:03,274 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:03:03,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:03:03,335 INFO L130 BoogieDeclarations]: Found specification of procedure puts [2021-11-07 02:03:03,335 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:03:03,337 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:03:03,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:03:03,338 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:03:08,525 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:03:08,525 INFO L299 CfgBuilder]: Removed 379 assume(true) statements. [2021-11-07 02:03:08,529 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:03:08 BoogieIcfgContainer [2021-11-07 02:03:08,529 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:03:08,531 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:03:08,531 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:03:08,535 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:03:08,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:03:01" (1/3) ... [2021-11-07 02:03:08,536 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5018827d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:03:08, skipping insertion in model container [2021-11-07 02:03:08,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:03:02" (2/3) ... [2021-11-07 02:03:08,537 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5018827d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:03:08, skipping insertion in model container [2021-11-07 02:03:08,537 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:03:08" (3/3) ... [2021-11-07 02:03:08,539 INFO L111 eAbstractionObserver]: Analyzing ICFG email_spec7_product31.cil.c [2021-11-07 02:03:08,545 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:03:08,546 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 02:03:08,634 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:03:08,645 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 02:03:08,645 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 02:03:08,691 INFO L276 IsEmpty]: Start isEmpty. Operand has 563 states, 560 states have (on average 1.7321428571428572) internal successors, (970), 562 states have internal predecessors, (970), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:08,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-07 02:03:08,731 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:08,732 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 02:03:08,733 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:08,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:08,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1971564646, now seen corresponding path program 1 times [2021-11-07 02:03:08,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:08,760 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2092004366] [2021-11-07 02:03:08,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:08,761 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:08,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:08,766 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:08,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:03:09,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:09,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-07 02:03:09,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:09,538 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 02:03:09,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:09,761 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 02:03:09,762 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:09,762 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2092004366] [2021-11-07 02:03:09,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2092004366] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:09,763 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:09,764 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-07 02:03:09,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835169548] [2021-11-07 02:03:09,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-07 02:03:09,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:09,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-07 02:03:09,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-07 02:03:09,805 INFO L87 Difference]: Start difference. First operand has 563 states, 560 states have (on average 1.7321428571428572) internal successors, (970), 562 states have internal predecessors, (970), 0 states have call successors, (0), 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 26.0) internal successors, (52), 2 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 02:03:09,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:09,960 INFO L93 Difference]: Finished difference Result 884 states and 1499 transitions. [2021-11-07 02:03:09,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 02:03:09,962 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 26.0) internal successors, (52), 2 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 52 [2021-11-07 02:03:09,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:09,992 INFO L225 Difference]: With dead ends: 884 [2021-11-07 02:03:09,992 INFO L226 Difference]: Without dead ends: 479 [2021-11-07 02:03:10,002 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 102 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 02:03:10,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-11-07 02:03:10,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 479. [2021-11-07 02:03:10,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 477 states have (on average 1.7379454926624738) internal successors, (829), 478 states have internal predecessors, (829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:10,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 829 transitions. [2021-11-07 02:03:10,084 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 829 transitions. Word has length 52 [2021-11-07 02:03:10,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:10,085 INFO L470 AbstractCegarLoop]: Abstraction has 479 states and 829 transitions. [2021-11-07 02:03:10,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 26.0) internal successors, (52), 2 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 02:03:10,086 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 829 transitions. [2021-11-07 02:03:10,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-07 02:03:10,091 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:10,092 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:10,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:10,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:10,309 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:10,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:10,310 INFO L85 PathProgramCache]: Analyzing trace with hash -618857657, now seen corresponding path program 1 times [2021-11-07 02:03:10,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:10,312 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [170329523] [2021-11-07 02:03:10,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:10,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:10,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:10,322 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:10,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 02:03:10,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:10,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 481 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:03:10,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:11,062 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 02:03:11,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:11,245 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 02:03:11,245 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:11,245 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [170329523] [2021-11-07 02:03:11,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [170329523] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:11,246 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:11,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:03:11,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852763374] [2021-11-07 02:03:11,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:03:11,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:11,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:03:11,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:03:11,254 INFO L87 Difference]: Start difference. First operand 479 states and 829 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 02:03:11,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:11,413 INFO L93 Difference]: Finished difference Result 1407 states and 2439 transitions. [2021-11-07 02:03:11,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:03:11,414 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 53 [2021-11-07 02:03:11,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:11,422 INFO L225 Difference]: With dead ends: 1407 [2021-11-07 02:03:11,423 INFO L226 Difference]: Without dead ends: 943 [2021-11-07 02:03:11,426 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 102 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 02:03:11,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 943 states. [2021-11-07 02:03:11,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 943 to 478. [2021-11-07 02:03:11,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 476 states have (on average 1.73109243697479) internal successors, (824), 477 states have internal predecessors, (824), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:11,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 824 transitions. [2021-11-07 02:03:11,524 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 824 transitions. Word has length 53 [2021-11-07 02:03:11,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:11,527 INFO L470 AbstractCegarLoop]: Abstraction has 478 states and 824 transitions. [2021-11-07 02:03:11,527 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 02:03:11,527 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 824 transitions. [2021-11-07 02:03:11,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-07 02:03:11,545 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:11,546 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:11,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:11,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:11,763 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:11,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:11,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1715174317, now seen corresponding path program 1 times [2021-11-07 02:03:11,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:11,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [944902962] [2021-11-07 02:03:11,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:11,766 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:11,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:11,775 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:11,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:03:12,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:12,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:03:12,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:12,542 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 02:03:12,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:12,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:03:12,742 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:12,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [944902962] [2021-11-07 02:03:12,743 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [944902962] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:12,743 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:12,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:03:12,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641140568] [2021-11-07 02:03:12,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:03:12,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:12,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:03:12,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:03:12,746 INFO L87 Difference]: Start difference. First operand 478 states and 824 transitions. Second operand has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:13,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:13,077 INFO L93 Difference]: Finished difference Result 1829 states and 3158 transitions. [2021-11-07 02:03:13,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:03:13,078 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-07 02:03:13,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:13,091 INFO L225 Difference]: With dead ends: 1829 [2021-11-07 02:03:13,091 INFO L226 Difference]: Without dead ends: 1369 [2021-11-07 02:03:13,093 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 104 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 02:03:13,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1369 states. [2021-11-07 02:03:13,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1369 to 477. [2021-11-07 02:03:13,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 475 states have (on average 1.7263157894736842) internal successors, (820), 476 states have internal predecessors, (820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:13,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 820 transitions. [2021-11-07 02:03:13,145 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 820 transitions. Word has length 55 [2021-11-07 02:03:13,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:13,146 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 820 transitions. [2021-11-07 02:03:13,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.0) internal successors, (60), 6 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:13,148 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 820 transitions. [2021-11-07 02:03:13,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-07 02:03:13,149 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:13,150 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] [2021-11-07 02:03:13,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:13,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:13,368 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:13,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:13,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1246941760, now seen corresponding path program 1 times [2021-11-07 02:03:13,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:13,370 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1564481157] [2021-11-07 02:03:13,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:13,370 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:13,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:13,373 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:13,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 02:03:13,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:13,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:03:13,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:14,087 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 02:03:14,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:14,265 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 02:03:14,265 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:14,267 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1564481157] [2021-11-07 02:03:14,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1564481157] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:14,267 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:14,267 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:03:14,268 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124020461] [2021-11-07 02:03:14,268 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:03:14,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:14,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:03:14,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:03:14,271 INFO L87 Difference]: Start difference. First operand 477 states and 820 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:14,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:14,378 INFO L93 Difference]: Finished difference Result 951 states and 1637 transitions. [2021-11-07 02:03:14,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:03:14,379 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-07 02:03:14,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:14,383 INFO L225 Difference]: With dead ends: 951 [2021-11-07 02:03:14,384 INFO L226 Difference]: Without dead ends: 482 [2021-11-07 02:03:14,385 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 108 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 02:03:14,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2021-11-07 02:03:14,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 477. [2021-11-07 02:03:14,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 475 states have (on average 1.72) internal successors, (817), 476 states have internal predecessors, (817), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:14,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 817 transitions. [2021-11-07 02:03:14,428 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 817 transitions. Word has length 56 [2021-11-07 02:03:14,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:14,430 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 817 transitions. [2021-11-07 02:03:14,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:14,433 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 817 transitions. [2021-11-07 02:03:14,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-07 02:03:14,437 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:14,437 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:14,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:14,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:14,650 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:14,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:14,651 INFO L85 PathProgramCache]: Analyzing trace with hash 1075397269, now seen corresponding path program 1 times [2021-11-07 02:03:14,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:14,652 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1874703976] [2021-11-07 02:03:14,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:14,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:14,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:14,654 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:14,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:03:15,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:15,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:03:15,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:15,422 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 02:03:15,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:15,610 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 02:03:15,614 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:15,615 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1874703976] [2021-11-07 02:03:15,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1874703976] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:15,615 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:15,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:03:15,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901745835] [2021-11-07 02:03:15,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:03:15,617 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:15,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:03:15,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:03:15,621 INFO L87 Difference]: Start difference. First operand 477 states and 817 transitions. Second operand has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:15,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:15,985 INFO L93 Difference]: Finished difference Result 1816 states and 3134 transitions. [2021-11-07 02:03:15,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:03:15,986 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-07 02:03:15,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:15,996 INFO L225 Difference]: With dead ends: 1816 [2021-11-07 02:03:15,997 INFO L226 Difference]: Without dead ends: 1365 [2021-11-07 02:03:15,998 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 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 02:03:16,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1365 states. [2021-11-07 02:03:16,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1365 to 477. [2021-11-07 02:03:16,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 475 states have (on average 1.7136842105263157) internal successors, (814), 476 states have internal predecessors, (814), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:16,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 814 transitions. [2021-11-07 02:03:16,059 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 814 transitions. Word has length 57 [2021-11-07 02:03:16,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:16,060 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 814 transitions. [2021-11-07 02:03:16,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:16,060 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 814 transitions. [2021-11-07 02:03:16,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-07 02:03:16,062 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:16,062 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:16,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:16,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:16,285 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:16,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:16,285 INFO L85 PathProgramCache]: Analyzing trace with hash 741170704, now seen corresponding path program 1 times [2021-11-07 02:03:16,286 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:16,286 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [236208605] [2021-11-07 02:03:16,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:16,287 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:16,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:16,288 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:16,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 02:03:16,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:16,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:16,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:17,054 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 02:03:17,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:17,226 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 02:03:17,226 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:17,226 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [236208605] [2021-11-07 02:03:17,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [236208605] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:17,228 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:17,228 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:03:17,228 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377337398] [2021-11-07 02:03:17,229 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:03:17,229 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:17,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:03:17,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:03:17,231 INFO L87 Difference]: Start difference. First operand 477 states and 814 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:17,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:17,345 INFO L93 Difference]: Finished difference Result 1165 states and 1989 transitions. [2021-11-07 02:03:17,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:03:17,346 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-07 02:03:17,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:17,353 INFO L225 Difference]: With dead ends: 1165 [2021-11-07 02:03:17,354 INFO L226 Difference]: Without dead ends: 928 [2021-11-07 02:03:17,355 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 114 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 02:03:17,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 928 states. [2021-11-07 02:03:17,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 928 to 691. [2021-11-07 02:03:17,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 691 states, 689 states have (on average 1.748911465892598) internal successors, (1205), 690 states have internal predecessors, (1205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:17,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 691 states to 691 states and 1205 transitions. [2021-11-07 02:03:17,430 INFO L78 Accepts]: Start accepts. Automaton has 691 states and 1205 transitions. Word has length 59 [2021-11-07 02:03:17,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:17,431 INFO L470 AbstractCegarLoop]: Abstraction has 691 states and 1205 transitions. [2021-11-07 02:03:17,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:17,431 INFO L276 IsEmpty]: Start isEmpty. Operand 691 states and 1205 transitions. [2021-11-07 02:03:17,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-07 02:03:17,433 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:17,433 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:17,451 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:17,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:17,651 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:17,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:17,652 INFO L85 PathProgramCache]: Analyzing trace with hash -174640671, now seen corresponding path program 1 times [2021-11-07 02:03:17,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:17,653 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1872607991] [2021-11-07 02:03:17,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:17,653 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:17,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:17,654 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:17,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-07 02:03:18,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:18,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:18,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:18,507 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 02:03:18,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:18,726 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 02:03:18,726 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:18,726 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1872607991] [2021-11-07 02:03:18,727 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1872607991] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:18,727 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:18,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:03:18,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050282086] [2021-11-07 02:03:18,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:03:18,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:18,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:03:18,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:18,729 INFO L87 Difference]: Start difference. First operand 691 states and 1205 transitions. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:18,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:18,849 INFO L93 Difference]: Finished difference Result 1697 states and 2963 transitions. [2021-11-07 02:03:18,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:18,850 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-07 02:03:18,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:18,858 INFO L225 Difference]: With dead ends: 1697 [2021-11-07 02:03:18,859 INFO L226 Difference]: Without dead ends: 1090 [2021-11-07 02:03:18,861 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:18,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1090 states. [2021-11-07 02:03:18,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1090 to 853. [2021-11-07 02:03:18,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 853 states, 851 states have (on average 1.7614571092831963) internal successors, (1499), 852 states have internal predecessors, (1499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:18,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 853 states to 853 states and 1499 transitions. [2021-11-07 02:03:18,990 INFO L78 Accepts]: Start accepts. Automaton has 853 states and 1499 transitions. Word has length 71 [2021-11-07 02:03:18,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:18,993 INFO L470 AbstractCegarLoop]: Abstraction has 853 states and 1499 transitions. [2021-11-07 02:03:18,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:18,994 INFO L276 IsEmpty]: Start isEmpty. Operand 853 states and 1499 transitions. [2021-11-07 02:03:18,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 02:03:18,996 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:18,997 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:19,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:19,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:19,215 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:19,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:19,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1989345600, now seen corresponding path program 1 times [2021-11-07 02:03:19,216 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:19,217 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [677003564] [2021-11-07 02:03:19,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:19,217 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:19,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:19,218 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:19,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 02:03:19,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:19,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 501 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:19,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:20,040 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 02:03:20,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:20,263 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 02:03:20,264 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:20,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [677003564] [2021-11-07 02:03:20,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [677003564] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:20,264 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:20,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:03:20,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58221768] [2021-11-07 02:03:20,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:03:20,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:20,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:03:20,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:20,266 INFO L87 Difference]: Start difference. First operand 853 states and 1499 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:20,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:20,451 INFO L93 Difference]: Finished difference Result 2227 states and 3931 transitions. [2021-11-07 02:03:20,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:20,452 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 02:03:20,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:20,463 INFO L225 Difference]: With dead ends: 2227 [2021-11-07 02:03:20,464 INFO L226 Difference]: Without dead ends: 1462 [2021-11-07 02:03:20,467 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:20,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1462 states. [2021-11-07 02:03:20,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1462 to 1225. [2021-11-07 02:03:20,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1225 states, 1223 states have (on average 1.7800490596892886) internal successors, (2177), 1224 states have internal predecessors, (2177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:20,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1225 states to 1225 states and 2177 transitions. [2021-11-07 02:03:20,648 INFO L78 Accepts]: Start accepts. Automaton has 1225 states and 2177 transitions. Word has length 72 [2021-11-07 02:03:20,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:20,649 INFO L470 AbstractCegarLoop]: Abstraction has 1225 states and 2177 transitions. [2021-11-07 02:03:20,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:20,649 INFO L276 IsEmpty]: Start isEmpty. Operand 1225 states and 2177 transitions. [2021-11-07 02:03:20,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:03:20,657 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:20,658 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:20,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:20,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:20,877 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:20,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:20,877 INFO L85 PathProgramCache]: Analyzing trace with hash 2128016240, now seen corresponding path program 1 times [2021-11-07 02:03:20,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:20,878 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [813534401] [2021-11-07 02:03:20,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:20,878 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:20,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:20,880 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:20,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 02:03:21,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:21,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:21,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:21,738 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 02:03:21,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:21,949 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 02:03:21,950 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:21,950 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [813534401] [2021-11-07 02:03:21,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [813534401] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:21,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:21,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 02:03:21,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635915793] [2021-11-07 02:03:21,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:03:21,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:21,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:03:21,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:03:21,953 INFO L87 Difference]: Start difference. First operand 1225 states and 2177 transitions. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:22,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:22,143 INFO L93 Difference]: Finished difference Result 2441 states and 4319 transitions. [2021-11-07 02:03:22,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:22,144 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 02:03:22,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:22,155 INFO L225 Difference]: With dead ends: 2441 [2021-11-07 02:03:22,156 INFO L226 Difference]: Without dead ends: 1462 [2021-11-07 02:03:22,158 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 142 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 02:03:22,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1462 states. [2021-11-07 02:03:22,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1462 to 1225. [2021-11-07 02:03:22,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1225 states, 1223 states have (on average 1.7784137367130008) internal successors, (2175), 1224 states have internal predecessors, (2175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:22,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1225 states to 1225 states and 2175 transitions. [2021-11-07 02:03:22,290 INFO L78 Accepts]: Start accepts. Automaton has 1225 states and 2175 transitions. Word has length 73 [2021-11-07 02:03:22,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:22,290 INFO L470 AbstractCegarLoop]: Abstraction has 1225 states and 2175 transitions. [2021-11-07 02:03:22,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:22,291 INFO L276 IsEmpty]: Start isEmpty. Operand 1225 states and 2175 transitions. [2021-11-07 02:03:22,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-07 02:03:22,297 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:22,298 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:22,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:22,515 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:22,515 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:22,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:22,516 INFO L85 PathProgramCache]: Analyzing trace with hash -524300273, now seen corresponding path program 1 times [2021-11-07 02:03:22,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:22,517 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1847853055] [2021-11-07 02:03:22,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:22,517 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:22,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:22,519 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:22,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-07 02:03:23,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:23,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:23,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:23,405 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 02:03:23,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:23,644 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 02:03:23,644 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:23,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1847853055] [2021-11-07 02:03:23,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1847853055] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:23,644 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:23,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:03:23,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86955291] [2021-11-07 02:03:23,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:03:23,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:23,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:03:23,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:23,647 INFO L87 Difference]: Start difference. First operand 1225 states and 2175 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:23,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:23,841 INFO L93 Difference]: Finished difference Result 3315 states and 5914 transitions. [2021-11-07 02:03:23,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:23,842 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2021-11-07 02:03:23,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:23,859 INFO L225 Difference]: With dead ends: 3315 [2021-11-07 02:03:23,859 INFO L226 Difference]: Without dead ends: 2186 [2021-11-07 02:03:23,862 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:23,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2186 states. [2021-11-07 02:03:24,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2186 to 1949. [2021-11-07 02:03:24,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1949 states, 1947 states have (on average 1.7945557267591166) internal successors, (3494), 1948 states have internal predecessors, (3494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:24,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1949 states to 1949 states and 3494 transitions. [2021-11-07 02:03:24,064 INFO L78 Accepts]: Start accepts. Automaton has 1949 states and 3494 transitions. Word has length 73 [2021-11-07 02:03:24,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:24,065 INFO L470 AbstractCegarLoop]: Abstraction has 1949 states and 3494 transitions. [2021-11-07 02:03:24,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:24,065 INFO L276 IsEmpty]: Start isEmpty. Operand 1949 states and 3494 transitions. [2021-11-07 02:03:24,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 02:03:24,070 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:24,071 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:24,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:24,288 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:24,289 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:24,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:24,289 INFO L85 PathProgramCache]: Analyzing trace with hash -1178281086, now seen corresponding path program 1 times [2021-11-07 02:03:24,290 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:24,290 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [161270552] [2021-11-07 02:03:24,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:24,290 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:24,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:24,293 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:24,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-07 02:03:25,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:25,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:25,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:25,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:03:25,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:25,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:03:25,515 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:25,515 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [161270552] [2021-11-07 02:03:25,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [161270552] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:25,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:25,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:03:25,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058218880] [2021-11-07 02:03:25,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:03:25,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:25,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:03:25,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:25,518 INFO L87 Difference]: Start difference. First operand 1949 states and 3494 transitions. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:25,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:25,794 INFO L93 Difference]: Finished difference Result 5223 states and 9390 transitions. [2021-11-07 02:03:25,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:25,795 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 02:03:25,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:25,823 INFO L225 Difference]: With dead ends: 5223 [2021-11-07 02:03:25,823 INFO L226 Difference]: Without dead ends: 3404 [2021-11-07 02:03:25,827 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:25,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3404 states. [2021-11-07 02:03:26,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3404 to 3167. [2021-11-07 02:03:26,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3167 states, 3165 states have (on average 1.8031595576619273) internal successors, (5707), 3166 states have internal predecessors, (5707), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:26,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3167 states to 3167 states and 5707 transitions. [2021-11-07 02:03:26,149 INFO L78 Accepts]: Start accepts. Automaton has 3167 states and 5707 transitions. Word has length 74 [2021-11-07 02:03:26,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:26,151 INFO L470 AbstractCegarLoop]: Abstraction has 3167 states and 5707 transitions. [2021-11-07 02:03:26,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:26,151 INFO L276 IsEmpty]: Start isEmpty. Operand 3167 states and 5707 transitions. [2021-11-07 02:03:26,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 02:03:26,158 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:26,158 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:26,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:26,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:26,375 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:26,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:26,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1121198176, now seen corresponding path program 1 times [2021-11-07 02:03:26,376 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:26,377 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [524712613] [2021-11-07 02:03:26,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:26,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:26,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:26,379 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:26,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 02:03:27,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:27,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:27,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:27,267 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 02:03:27,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:27,482 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 02:03:27,482 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:27,483 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [524712613] [2021-11-07 02:03:27,483 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [524712613] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:27,483 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:27,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:03:27,483 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407950100] [2021-11-07 02:03:27,484 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:03:27,484 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:27,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:03:27,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:27,486 INFO L87 Difference]: Start difference. First operand 3167 states and 5707 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:27,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:27,927 INFO L93 Difference]: Finished difference Result 8593 states and 15512 transitions. [2021-11-07 02:03:27,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:27,928 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-07 02:03:27,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:27,973 INFO L225 Difference]: With dead ends: 8593 [2021-11-07 02:03:27,973 INFO L226 Difference]: Without dead ends: 5590 [2021-11-07 02:03:27,980 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 147 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 02:03:27,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5590 states. [2021-11-07 02:03:28,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5590 to 5353. [2021-11-07 02:03:28,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5353 states, 5351 states have (on average 1.806765090637264) internal successors, (9668), 5352 states have internal predecessors, (9668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:28,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5353 states to 5353 states and 9668 transitions. [2021-11-07 02:03:28,611 INFO L78 Accepts]: Start accepts. Automaton has 5353 states and 9668 transitions. Word has length 75 [2021-11-07 02:03:28,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:28,612 INFO L470 AbstractCegarLoop]: Abstraction has 5353 states and 9668 transitions. [2021-11-07 02:03:28,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:28,613 INFO L276 IsEmpty]: Start isEmpty. Operand 5353 states and 9668 transitions. [2021-11-07 02:03:28,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 02:03:28,626 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:28,626 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:28,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:28,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:28,840 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:28,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:28,841 INFO L85 PathProgramCache]: Analyzing trace with hash 2111143108, now seen corresponding path program 1 times [2021-11-07 02:03:28,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:28,842 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [396253552] [2021-11-07 02:03:28,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:28,842 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:28,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:28,844 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:28,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-07 02:03:29,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:29,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:03:29,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:29,914 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 02:03:29,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:30,229 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 02:03:30,230 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:30,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [396253552] [2021-11-07 02:03:30,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [396253552] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:30,231 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:30,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-07 02:03:30,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403896196] [2021-11-07 02:03:30,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 02:03:30,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:30,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 02:03:30,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 02:03:30,234 INFO L87 Difference]: Start difference. First operand 5353 states and 9668 transitions. Second operand has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:33,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:33,721 INFO L93 Difference]: Finished difference Result 20052 states and 36253 transitions. [2021-11-07 02:03:33,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:03:33,722 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 02:03:33,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:33,822 INFO L225 Difference]: With dead ends: 20052 [2021-11-07 02:03:33,823 INFO L226 Difference]: Without dead ends: 14943 [2021-11-07 02:03:33,836 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 146 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 02:03:33,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14943 states. [2021-11-07 02:03:34,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14943 to 5303. [2021-11-07 02:03:34,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5303 states, 5301 states have (on average 1.7860780984719864) internal successors, (9468), 5302 states have internal predecessors, (9468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:34,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5303 states to 5303 states and 9468 transitions. [2021-11-07 02:03:34,514 INFO L78 Accepts]: Start accepts. Automaton has 5303 states and 9468 transitions. Word has length 76 [2021-11-07 02:03:34,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:34,515 INFO L470 AbstractCegarLoop]: Abstraction has 5303 states and 9468 transitions. [2021-11-07 02:03:34,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 6 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:34,516 INFO L276 IsEmpty]: Start isEmpty. Operand 5303 states and 9468 transitions. [2021-11-07 02:03:34,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-07 02:03:34,525 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:34,525 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:34,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:34,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:34,743 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:34,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:34,744 INFO L85 PathProgramCache]: Analyzing trace with hash 1697216819, now seen corresponding path program 1 times [2021-11-07 02:03:34,744 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:34,745 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1792152636] [2021-11-07 02:03:34,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:34,745 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:34,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:34,747 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:34,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 02:03:35,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:35,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 02:03:35,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:35,990 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 02:03:35,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:36,231 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 02:03:36,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:36,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1792152636] [2021-11-07 02:03:36,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1792152636] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:36,232 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:03:36,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 02:03:36,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298838507] [2021-11-07 02:03:36,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 02:03:36,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:36,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 02:03:36,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 02:03:36,235 INFO L87 Difference]: Start difference. First operand 5303 states and 9468 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:37,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:37,036 INFO L93 Difference]: Finished difference Result 15330 states and 27418 transitions. [2021-11-07 02:03:37,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 02:03:37,037 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2021-11-07 02:03:37,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:37,072 INFO L225 Difference]: With dead ends: 15330 [2021-11-07 02:03:37,072 INFO L226 Difference]: Without dead ends: 10198 [2021-11-07 02:03:37,083 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 149 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 02:03:37,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10198 states. [2021-11-07 02:03:38,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10198 to 9961. [2021-11-07 02:03:38,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9961 states, 9959 states have (on average 1.7878301034240385) internal successors, (17805), 9960 states have internal predecessors, (17805), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:38,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9961 states to 9961 states and 17805 transitions. [2021-11-07 02:03:38,137 INFO L78 Accepts]: Start accepts. Automaton has 9961 states and 17805 transitions. Word has length 76 [2021-11-07 02:03:38,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:38,138 INFO L470 AbstractCegarLoop]: Abstraction has 9961 states and 17805 transitions. [2021-11-07 02:03:38,138 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:38,138 INFO L276 IsEmpty]: Start isEmpty. Operand 9961 states and 17805 transitions. [2021-11-07 02:03:38,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-07 02:03:38,150 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:38,151 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] [2021-11-07 02:03:38,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:38,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:03:38,368 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:38,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:38,369 INFO L85 PathProgramCache]: Analyzing trace with hash -471138753, now seen corresponding path program 1 times [2021-11-07 02:03:38,370 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:38,370 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2146746661] [2021-11-07 02:03:38,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:38,370 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:38,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:38,372 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:38,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:03:39,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:39,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:03:39,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:39,742 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 02:03:39,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:40,061 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 02:03:40,061 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:40,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2146746661] [2021-11-07 02:03:40,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2146746661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:03:40,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [186207048] [2021-11-07 02:03:40,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:40,062 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:03:40,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:03:40,066 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:03:40,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:03:41,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:41,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:03:41,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:41,534 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 02:03:41,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:41,873 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 02:03:41,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [186207048] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:41,874 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:03:41,874 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 02:03:41,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463813052] [2021-11-07 02:03:41,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:03:41,875 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:41,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:03:41,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:03:41,877 INFO L87 Difference]: Start difference. First operand 9961 states and 17805 transitions. Second operand has 10 states, 10 states have (on average 11.2) internal successors, (112), 10 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 02:03:48,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:48,945 INFO L93 Difference]: Finished difference Result 60598 states and 108567 transitions. [2021-11-07 02:03:48,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 02:03:48,946 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 11.2) internal successors, (112), 10 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 77 [2021-11-07 02:03:48,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:49,166 INFO L225 Difference]: With dead ends: 60598 [2021-11-07 02:03:49,166 INFO L226 Difference]: Without dead ends: 60379 [2021-11-07 02:03:49,180 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=242, Invalid=1018, Unknown=0, NotChecked=0, Total=1260 [2021-11-07 02:03:49,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60379 states. [2021-11-07 02:03:51,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60379 to 19841. [2021-11-07 02:03:51,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19841 states, 19839 states have (on average 1.788245375270931) internal successors, (35477), 19840 states have internal predecessors, (35477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:51,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19841 states to 19841 states and 35477 transitions. [2021-11-07 02:03:51,466 INFO L78 Accepts]: Start accepts. Automaton has 19841 states and 35477 transitions. Word has length 77 [2021-11-07 02:03:51,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:51,467 INFO L470 AbstractCegarLoop]: Abstraction has 19841 states and 35477 transitions. [2021-11-07 02:03:51,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 11.2) internal successors, (112), 10 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 02:03:51,467 INFO L276 IsEmpty]: Start isEmpty. Operand 19841 states and 35477 transitions. [2021-11-07 02:03:51,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 02:03:51,671 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:51,672 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:51,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:51,892 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Ended with exit code 0 [2021-11-07 02:03:52,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:03:52,088 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:52,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:52,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1955418248, now seen corresponding path program 1 times [2021-11-07 02:03:52,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:03:52,090 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1688584280] [2021-11-07 02:03:52,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:52,090 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:03:52,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:03:52,091 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:03:52,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 02:03:52,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:53,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:03:53,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:53,269 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 02:03:53,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:53,567 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 02:03:53,567 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:03:53,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1688584280] [2021-11-07 02:03:53,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1688584280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:03:53,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [119778861] [2021-11-07 02:03:53,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:53,568 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:03:53,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:03:53,569 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:03:53,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 02:03:54,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:54,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:03:54,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:55,085 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 02:03:55,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:55,360 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 02:03:55,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [119778861] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:03:55,360 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:03:55,360 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-07 02:03:55,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928485647] [2021-11-07 02:03:55,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:03:55,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:03:55,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:03:55,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:03:55,369 INFO L87 Difference]: Start difference. First operand 19841 states and 35477 transitions. Second operand has 5 states, 5 states have (on average 14.4) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:03:58,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:58,620 INFO L93 Difference]: Finished difference Result 20510 states and 36570 transitions. [2021-11-07 02:03:58,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:03:58,620 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 14.4) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 02:03:58,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:58,675 INFO L225 Difference]: With dead ends: 20510 [2021-11-07 02:03:58,676 INFO L226 Difference]: Without dead ends: 20125 [2021-11-07 02:03:58,683 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:03:58,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20125 states. [2021-11-07 02:04:00,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20125 to 19835. [2021-11-07 02:04:00,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19835 states, 19833 states have (on average 1.788130892956184) internal successors, (35464), 19834 states have internal predecessors, (35464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:00,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19835 states to 19835 states and 35464 transitions. [2021-11-07 02:04:00,395 INFO L78 Accepts]: Start accepts. Automaton has 19835 states and 35464 transitions. Word has length 78 [2021-11-07 02:04:00,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:00,396 INFO L470 AbstractCegarLoop]: Abstraction has 19835 states and 35464 transitions. [2021-11-07 02:04:00,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 14.4) internal successors, (72), 5 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:00,396 INFO L276 IsEmpty]: Start isEmpty. Operand 19835 states and 35464 transitions. [2021-11-07 02:04:00,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-07 02:04:00,418 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:00,418 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:00,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:00,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:00,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:00,831 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:00,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:00,831 INFO L85 PathProgramCache]: Analyzing trace with hash 1454357298, now seen corresponding path program 1 times [2021-11-07 02:04:00,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:00,832 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1877503211] [2021-11-07 02:04:00,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:00,832 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:00,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:00,833 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:00,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 02:04:01,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:01,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 516 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:04:01,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:02,003 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 02:04:02,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:02,234 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 02:04:02,234 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:02,234 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1877503211] [2021-11-07 02:04:02,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1877503211] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:02,234 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:04:02,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2021-11-07 02:04:02,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553407905] [2021-11-07 02:04:02,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 02:04:02,235 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:02,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 02:04:02,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 02:04:02,237 INFO L87 Difference]: Start difference. First operand 19835 states and 35464 transitions. Second operand has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:03,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:03,846 INFO L93 Difference]: Finished difference Result 38779 states and 69556 transitions. [2021-11-07 02:04:03,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 02:04:03,848 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-07 02:04:03,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:03,890 INFO L225 Difference]: With dead ends: 38779 [2021-11-07 02:04:03,890 INFO L226 Difference]: Without dead ends: 19191 [2021-11-07 02:04:03,921 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 152 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 02:04:03,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19191 states. [2021-11-07 02:04:04,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19191 to 9959. [2021-11-07 02:04:04,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9959 states, 9957 states have (on average 1.7872853269056945) internal successors, (17796), 9958 states have internal predecessors, (17796), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:04,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9959 states to 9959 states and 17796 transitions. [2021-11-07 02:04:04,900 INFO L78 Accepts]: Start accepts. Automaton has 9959 states and 17796 transitions. Word has length 78 [2021-11-07 02:04:04,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:04,900 INFO L470 AbstractCegarLoop]: Abstraction has 9959 states and 17796 transitions. [2021-11-07 02:04:04,900 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.0) internal successors, (72), 4 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:04,901 INFO L276 IsEmpty]: Start isEmpty. Operand 9959 states and 17796 transitions. [2021-11-07 02:04:04,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-07 02:04:04,912 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:04,912 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:04,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:05,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:05,125 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:05,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:05,125 INFO L85 PathProgramCache]: Analyzing trace with hash -1908552906, now seen corresponding path program 1 times [2021-11-07 02:04:05,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:05,126 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [715586745] [2021-11-07 02:04:05,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:05,126 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:05,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:05,127 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:05,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-07 02:04:06,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:06,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:04:06,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:06,349 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 02:04:06,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:06,617 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 02:04:06,618 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:06,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [715586745] [2021-11-07 02:04:06,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [715586745] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:04:06,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1987396031] [2021-11-07 02:04:06,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:06,619 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:06,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:04:06,622 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:04:06,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-07 02:04:07,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:07,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 527 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:04:07,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:08,934 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 02:04:08,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:09,453 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 02:04:09,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1987396031] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:09,454 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:04:09,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:04:09,455 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465850918] [2021-11-07 02:04:09,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:04:09,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:09,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:04:09,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:04:09,457 INFO L87 Difference]: Start difference. First operand 9959 states and 17796 transitions. Second operand has 16 states, 16 states have (on average 8.0625) internal successors, (129), 15 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:25,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:25,349 INFO L93 Difference]: Finished difference Result 22462 states and 39618 transitions. [2021-11-07 02:04:25,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:04:25,350 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.0625) internal successors, (129), 15 states have internal predecessors, (129), 0 states have call successors, (0), 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 80 [2021-11-07 02:04:25,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:25,382 INFO L225 Difference]: With dead ends: 22462 [2021-11-07 02:04:25,382 INFO L226 Difference]: Without dead ends: 22254 [2021-11-07 02:04:25,387 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 02:04:25,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22254 states. [2021-11-07 02:04:26,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22254 to 19810. [2021-11-07 02:04:26,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19810 states, 19808 states have (on average 1.7882168820678515) internal successors, (35421), 19809 states have internal predecessors, (35421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:26,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19810 states to 19810 states and 35421 transitions. [2021-11-07 02:04:26,897 INFO L78 Accepts]: Start accepts. Automaton has 19810 states and 35421 transitions. Word has length 80 [2021-11-07 02:04:26,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:26,898 INFO L470 AbstractCegarLoop]: Abstraction has 19810 states and 35421 transitions. [2021-11-07 02:04:26,898 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.0625) internal successors, (129), 15 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:26,898 INFO L276 IsEmpty]: Start isEmpty. Operand 19810 states and 35421 transitions. [2021-11-07 02:04:26,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-07 02:04:26,919 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:26,920 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] [2021-11-07 02:04:26,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:27,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:27,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:27,324 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:27,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:27,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1160964417, now seen corresponding path program 1 times [2021-11-07 02:04:27,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:27,325 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [734419324] [2021-11-07 02:04:27,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:27,326 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:27,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:27,326 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:27,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-07 02:04:28,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:28,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:04:28,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:28,579 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 02:04:28,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:28,870 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 02:04:28,870 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:28,870 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [734419324] [2021-11-07 02:04:28,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [734419324] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:04:28,871 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2051421455] [2021-11-07 02:04:28,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:28,871 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:28,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:04:28,880 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:04:28,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-07 02:04:30,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:30,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-07 02:04:30,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:30,672 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 02:04:30,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:30,960 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 02:04:30,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2051421455] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:30,960 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:04:30,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5, 5] total 13 [2021-11-07 02:04:30,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943219984] [2021-11-07 02:04:30,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 02:04:30,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:30,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 02:04:30,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-07 02:04:30,962 INFO L87 Difference]: Start difference. First operand 19810 states and 35421 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:34,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:34,560 INFO L93 Difference]: Finished difference Result 20477 states and 36503 transitions. [2021-11-07 02:04:34,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-07 02:04:34,561 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-07 02:04:34,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:34,600 INFO L225 Difference]: With dead ends: 20477 [2021-11-07 02:04:34,600 INFO L226 Difference]: Without dead ends: 20011 [2021-11-07 02:04:34,607 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 309 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 02:04:34,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20011 states. [2021-11-07 02:04:36,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20011 to 19792. [2021-11-07 02:04:36,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19792 states, 19790 states have (on average 1.787822132390096) internal successors, (35381), 19791 states have internal predecessors, (35381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:36,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19792 states to 19792 states and 35381 transitions. [2021-11-07 02:04:36,396 INFO L78 Accepts]: Start accepts. Automaton has 19792 states and 35381 transitions. Word has length 81 [2021-11-07 02:04:36,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:36,396 INFO L470 AbstractCegarLoop]: Abstraction has 19792 states and 35381 transitions. [2021-11-07 02:04:36,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 7 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:04:36,396 INFO L276 IsEmpty]: Start isEmpty. Operand 19792 states and 35381 transitions. [2021-11-07 02:04:36,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-07 02:04:36,412 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:36,413 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] [2021-11-07 02:04:36,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:36,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-07 02:04:36,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:04:36,820 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:36,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:36,820 INFO L85 PathProgramCache]: Analyzing trace with hash 508205081, now seen corresponding path program 1 times [2021-11-07 02:04:36,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:04:36,821 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [818914668] [2021-11-07 02:04:36,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:36,821 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:04:36,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:04:36,822 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:04:36,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-07 02:04:37,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:37,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:04:38,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:38,226 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 02:04:38,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:38,495 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 02:04:38,495 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:04:38,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [818914668] [2021-11-07 02:04:38,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [818914668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:04:38,496 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [339855171] [2021-11-07 02:04:38,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:38,496 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:04:38,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:04:38,510 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:04:38,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-07 02:04:40,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:40,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-07 02:04:40,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:40,882 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:04:40,882 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:41,368 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 02:04:41,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [339855171] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:04:41,368 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:04:41,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 22 [2021-11-07 02:04:41,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59981955] [2021-11-07 02:04:41,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 02:04:41,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:04:41,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 02:04:41,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2021-11-07 02:04:41,370 INFO L87 Difference]: Start difference. First operand 19792 states and 35381 transitions. Second operand has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:01,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:01,004 INFO L93 Difference]: Finished difference Result 43534 states and 76977 transitions. [2021-11-07 02:05:01,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-07 02:05:01,005 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 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 81 [2021-11-07 02:05:01,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:01,073 INFO L225 Difference]: With dead ends: 43534 [2021-11-07 02:05:01,074 INFO L226 Difference]: Without dead ends: 43177 [2021-11-07 02:05:01,081 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=578, Invalid=1678, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 02:05:01,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43177 states. [2021-11-07 02:05:03,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43177 to 39389. [2021-11-07 02:05:04,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39389 states, 39387 states have (on average 1.7882803970853327) internal successors, (70435), 39388 states have internal predecessors, (70435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:04,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39389 states to 39389 states and 70435 transitions. [2021-11-07 02:05:04,085 INFO L78 Accepts]: Start accepts. Automaton has 39389 states and 70435 transitions. Word has length 81 [2021-11-07 02:05:04,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:04,085 INFO L470 AbstractCegarLoop]: Abstraction has 39389 states and 70435 transitions. [2021-11-07 02:05:04,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.1875) internal successors, (131), 15 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:04,085 INFO L276 IsEmpty]: Start isEmpty. Operand 39389 states and 70435 transitions. [2021-11-07 02:05:04,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-07 02:05:04,111 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:04,111 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] [2021-11-07 02:05:04,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:04,347 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:04,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:04,538 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:04,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:04,539 INFO L85 PathProgramCache]: Analyzing trace with hash -309443369, now seen corresponding path program 1 times [2021-11-07 02:05:04,539 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:04,539 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [566421851] [2021-11-07 02:05:04,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:04,540 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:04,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:04,541 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:04,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-07 02:05:05,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:05,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:05,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:06,091 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 02:05:06,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:06,358 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 02:05:06,358 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:06,358 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [566421851] [2021-11-07 02:05:06,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [566421851] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:06,358 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [182820611] [2021-11-07 02:05:06,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:06,359 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:06,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:06,359 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:06,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-07 02:05:08,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:08,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 528 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-07 02:05:08,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:08,613 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 02:05:08,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:09,128 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 02:05:09,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [182820611] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:09,129 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:09,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-07 02:05:09,129 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72218540] [2021-11-07 02:05:09,129 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-07 02:05:09,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:09,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-07 02:05:09,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2021-11-07 02:05:09,131 INFO L87 Difference]: Start difference. First operand 39389 states and 70435 transitions. Second operand has 14 states, 14 states have (on average 9.5) internal successors, (133), 14 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:20,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:20,140 INFO L93 Difference]: Finished difference Result 48314 states and 84670 transitions. [2021-11-07 02:05:20,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-07 02:05:20,140 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 9.5) internal successors, (133), 14 states have internal predecessors, (133), 0 states have call successors, (0), 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 81 [2021-11-07 02:05:20,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:20,217 INFO L225 Difference]: With dead ends: 48314 [2021-11-07 02:05:20,217 INFO L226 Difference]: Without dead ends: 47528 [2021-11-07 02:05:20,227 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 303 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=826, Invalid=2596, Unknown=0, NotChecked=0, Total=3422 [2021-11-07 02:05:20,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47528 states. [2021-11-07 02:05:23,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47528 to 39865. [2021-11-07 02:05:23,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39865 states, 39863 states have (on average 1.7853397887765596) internal successors, (71169), 39864 states have internal predecessors, (71169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:23,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39865 states to 39865 states and 71169 transitions. [2021-11-07 02:05:23,598 INFO L78 Accepts]: Start accepts. Automaton has 39865 states and 71169 transitions. Word has length 81 [2021-11-07 02:05:23,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:23,598 INFO L470 AbstractCegarLoop]: Abstraction has 39865 states and 71169 transitions. [2021-11-07 02:05:23,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 9.5) internal successors, (133), 14 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:23,599 INFO L276 IsEmpty]: Start isEmpty. Operand 39865 states and 71169 transitions. [2021-11-07 02:05:23,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 02:05:23,616 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:23,616 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] [2021-11-07 02:05:23,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:23,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:24,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:05:24,017 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:24,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:24,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1399375818, now seen corresponding path program 1 times [2021-11-07 02:05:24,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:24,020 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1284187061] [2021-11-07 02:05:24,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:24,021 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:24,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:24,022 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:24,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-07 02:05:25,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:25,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:25,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:25,651 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 02:05:25,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:25,966 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 02:05:25,966 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:25,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1284187061] [2021-11-07 02:05:25,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1284187061] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:25,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1444219546] [2021-11-07 02:05:25,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:25,967 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:25,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:25,972 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:25,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-07 02:05:27,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:27,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 02:05:27,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:28,225 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 02:05:28,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:28,583 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 02:05:28,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1444219546] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:28,583 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:28,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 11 [2021-11-07 02:05:28,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708477858] [2021-11-07 02:05:28,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:05:28,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:28,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:05:28,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:05:28,585 INFO L87 Difference]: Start difference. First operand 39865 states and 71169 transitions. Second operand has 5 states, 5 states have (on average 15.2) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:33,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:33,884 INFO L93 Difference]: Finished difference Result 47079 states and 82637 transitions. [2021-11-07 02:05:33,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 02:05:33,887 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.2) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 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 82 [2021-11-07 02:05:33,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:33,957 INFO L225 Difference]: With dead ends: 47079 [2021-11-07 02:05:33,957 INFO L226 Difference]: Without dead ends: 46079 [2021-11-07 02:05:33,966 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 315 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 02:05:34,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46079 states. [2021-11-07 02:05:38,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46079 to 41289. [2021-11-07 02:05:38,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41289 states, 41287 states have (on average 1.7778719693850364) internal successors, (73403), 41288 states have internal predecessors, (73403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:38,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41289 states to 41289 states and 73403 transitions. [2021-11-07 02:05:38,122 INFO L78 Accepts]: Start accepts. Automaton has 41289 states and 73403 transitions. Word has length 82 [2021-11-07 02:05:38,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:38,122 INFO L470 AbstractCegarLoop]: Abstraction has 41289 states and 73403 transitions. [2021-11-07 02:05:38,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.2) internal successors, (76), 4 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:05:38,123 INFO L276 IsEmpty]: Start isEmpty. Operand 41289 states and 73403 transitions. [2021-11-07 02:05:38,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 02:05:38,143 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:38,143 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] [2021-11-07 02:05:38,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:38,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:38,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:38,544 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:38,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:38,545 INFO L85 PathProgramCache]: Analyzing trace with hash 1226560696, now seen corresponding path program 1 times [2021-11-07 02:05:38,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:05:38,545 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2040653383] [2021-11-07 02:05:38,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:38,546 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:05:38,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:05:38,546 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:05:38,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 02:05:40,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:40,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:05:40,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:40,372 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 02:05:40,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:40,659 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 02:05:40,659 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:05:40,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2040653383] [2021-11-07 02:05:40,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2040653383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:05:40,659 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1533810797] [2021-11-07 02:05:40,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:40,660 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:05:40,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:05:40,660 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:05:40,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1533bab5-2a9a-4917-975e-aea8ce8a5ed8/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 02:05:42,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:42,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 530 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-07 02:05:42,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:43,248 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 02:05:43,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:43,527 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 02:05:43,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1533810797] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:05:43,527 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:05:43,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5] total 16 [2021-11-07 02:05:43,528 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277345735] [2021-11-07 02:05:43,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:05:43,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:05:43,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:05:43,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:05:43,530 INFO L87 Difference]: Start difference. First operand 41289 states and 73403 transitions. Second operand has 10 states, 10 states have (on average 7.7) internal successors, (77), 10 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)