./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e77c044 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cbc7a588e1092d0916f2339b4d4b9e0fa8415335 ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8 --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cbc7a588e1092d0916f2339b4d4b9e0fa8415335 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-free) --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:13:10,572 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:13:10,575 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:13:10,617 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:13:10,617 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:13:10,619 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:13:10,621 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:13:10,623 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:13:10,625 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:13:10,626 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:13:10,628 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:13:10,629 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:13:10,630 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:13:10,631 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:13:10,633 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:13:10,635 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:13:10,636 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:13:10,637 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:13:10,640 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:13:10,643 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:13:10,646 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:13:10,648 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:13:10,649 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:13:10,650 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:13:10,655 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:13:10,656 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:13:10,656 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:13:10,657 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:13:10,658 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:13:10,659 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:13:10,660 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:13:10,661 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:13:10,662 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:13:10,663 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:13:10,664 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:13:10,665 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:13:10,666 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:13:10,666 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:13:10,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:13:10,668 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:13:10,669 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:13:10,670 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-10-13 07:13:10,701 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:13:10,701 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:13:10,702 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:13:10,703 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:13:10,703 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:13:10,704 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:13:10,704 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 07:13:10,705 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:13:10,705 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:13:10,705 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 07:13:10,706 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 07:13:10,706 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:13:10,706 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 07:13:10,707 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 07:13:10,707 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 07:13:10,708 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 07:13:10,708 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 07:13:10,708 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:13:10,709 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:13:10,709 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 07:13:10,709 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 07:13:10,709 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:13:10,710 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:13:10,710 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 07:13:10,710 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 07:13:10,710 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 07:13:10,711 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:13:10,711 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:13:10,711 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:13:10,711 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:13:10,712 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:13:10,712 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:13:10,712 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:13:10,713 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:13:10,713 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:13:10,713 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 07:13:10,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 07:13:10,714 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:13:10,714 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:13:10,714 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_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cbc7a588e1092d0916f2339b4d4b9e0fa8415335 [2021-10-13 07:13:10,961 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:13:10,983 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:13:10,986 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:13:10,987 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:13:10,988 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:13:10,989 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-13 07:13:11,061 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/9404fcaf7/0a1e41352fb94ee58ac8a36d2fb5a887/FLAGc208244ba [2021-10-13 07:13:11,652 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:13:11,652 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-13 07:13:11,688 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/9404fcaf7/0a1e41352fb94ee58ac8a36d2fb5a887/FLAGc208244ba [2021-10-13 07:13:11,933 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/9404fcaf7/0a1e41352fb94ee58ac8a36d2fb5a887 [2021-10-13 07:13:11,936 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:13:11,942 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:13:11,945 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:13:11,946 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:13:11,951 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:13:11,951 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:13:11" (1/1) ... [2021-10-13 07:13:11,954 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@747ef066 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:11, skipping insertion in model container [2021-10-13 07:13:11,955 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:13:11" (1/1) ... [2021-10-13 07:13:11,963 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:13:12,015 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:13:12,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:13:12,361 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:13:12,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:13:12,480 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:13:12,481 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12 WrapperNode [2021-10-13 07:13:12,481 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:13:12,482 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:13:12,483 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:13:12,483 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:13:12,490 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,505 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,529 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:13:12,530 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:13:12,530 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:13:12,530 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:13:12,538 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,539 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,545 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,546 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,556 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,565 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,567 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,569 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:13:12,573 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:13:12,573 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:13:12,573 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:13:12,581 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (1/1) ... [2021-10-13 07:13:12,590 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:13:12,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:12,614 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:13:12,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:13:12,652 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 07:13:12,652 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 07:13:12,652 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 07:13:12,653 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:13:12,653 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:13:12,653 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-13 07:13:12,653 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:13:12,654 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:13:13,116 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:13:13,116 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-13 07:13:13,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:13:13 BoogieIcfgContainer [2021-10-13 07:13:13,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:13:13,121 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:13:13,121 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:13:13,137 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:13:13,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:13:11" (1/3) ... [2021-10-13 07:13:13,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a575db2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:13:13, skipping insertion in model container [2021-10-13 07:13:13,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:12" (2/3) ... [2021-10-13 07:13:13,139 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a575db2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:13:13, skipping insertion in model container [2021-10-13 07:13:13,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:13:13" (3/3) ... [2021-10-13 07:13:13,140 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1_1-3.i [2021-10-13 07:13:13,146 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:13:13,146 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2021-10-13 07:13:13,202 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:13:13,209 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=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-10-13 07:13:13,209 INFO L340 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2021-10-13 07:13:13,225 INFO L276 IsEmpty]: Start isEmpty. Operand has 47 states, 25 states have (on average 2.04) internal successors, (51), 46 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-13 07:13:13,231 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:13,232 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-13 07:13:13,232 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:13,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:13,237 INFO L82 PathProgramCache]: Analyzing trace with hash 3767634, now seen corresponding path program 1 times [2021-10-13 07:13:13,246 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:13,246 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182119461] [2021-10-13 07:13:13,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:13,248 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:13,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:13,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:13,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:13,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182119461] [2021-10-13 07:13:13,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182119461] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:13,474 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:13,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:13:13,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080987809] [2021-10-13 07:13:13,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-13 07:13:13,482 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:13,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-13 07:13:13,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-13 07:13:13,504 INFO L87 Difference]: Start difference. First operand has 47 states, 25 states have (on average 2.04) internal successors, (51), 46 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:13,522 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-10-13 07:13:13,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-13 07:13:13,525 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 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 4 [2021-10-13 07:13:13,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:13,536 INFO L225 Difference]: With dead ends: 47 [2021-10-13 07:13:13,536 INFO L226 Difference]: Without dead ends: 46 [2021-10-13 07:13:13,539 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-13 07:13:13,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-10-13 07:13:13,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-10-13 07:13:13,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 25 states have (on average 1.96) internal successors, (49), 45 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2021-10-13 07:13:13,586 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 4 [2021-10-13 07:13:13,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:13,586 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2021-10-13 07:13:13,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,587 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2021-10-13 07:13:13,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-13 07:13:13,588 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:13,588 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-13 07:13:13,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 07:13:13,589 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:13,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:13,594 INFO L82 PathProgramCache]: Analyzing trace with hash 116582307, now seen corresponding path program 1 times [2021-10-13 07:13:13,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:13,595 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496145727] [2021-10-13 07:13:13,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:13,595 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:13,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:13,675 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:13,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:13,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496145727] [2021-10-13 07:13:13,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496145727] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:13,676 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:13,676 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:13:13,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716111407] [2021-10-13 07:13:13,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:13:13,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:13,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:13:13,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:13,680 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:13,718 INFO L93 Difference]: Finished difference Result 45 states and 48 transitions. [2021-10-13 07:13:13,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:13:13,719 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-10-13 07:13:13,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:13,720 INFO L225 Difference]: With dead ends: 45 [2021-10-13 07:13:13,721 INFO L226 Difference]: Without dead ends: 45 [2021-10-13 07:13:13,721 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:13,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-10-13 07:13:13,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-10-13 07:13:13,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 25 states have (on average 1.92) internal successors, (48), 44 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-10-13 07:13:13,728 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 5 [2021-10-13 07:13:13,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:13,728 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-10-13 07:13:13,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,729 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-10-13 07:13:13,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-13 07:13:13,729 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:13,729 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-13 07:13:13,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 07:13:13,730 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:13,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:13,731 INFO L82 PathProgramCache]: Analyzing trace with hash 116582308, now seen corresponding path program 1 times [2021-10-13 07:13:13,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:13,731 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410047533] [2021-10-13 07:13:13,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:13,732 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:13,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:13,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:13,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:13,843 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410047533] [2021-10-13 07:13:13,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410047533] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:13,843 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:13,843 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 07:13:13,844 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378215682] [2021-10-13 07:13:13,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:13:13,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:13,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:13:13,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:13:13,858 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:13,963 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2021-10-13 07:13:13,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:13:13,966 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-10-13 07:13:13,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:13,968 INFO L225 Difference]: With dead ends: 88 [2021-10-13 07:13:13,968 INFO L226 Difference]: Without dead ends: 88 [2021-10-13 07:13:13,969 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:13:13,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-10-13 07:13:13,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 49. [2021-10-13 07:13:13,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 48 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-10-13 07:13:13,986 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 5 [2021-10-13 07:13:13,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:13,986 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-10-13 07:13:13,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:13,987 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-10-13 07:13:13,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-13 07:13:13,989 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:13,989 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:13,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-13 07:13:13,991 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:13,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:13,992 INFO L82 PathProgramCache]: Analyzing trace with hash 366521265, now seen corresponding path program 1 times [2021-10-13 07:13:13,993 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:13,993 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704122111] [2021-10-13 07:13:13,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:13,993 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:14,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:14,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:14,059 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:14,059 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704122111] [2021-10-13 07:13:14,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704122111] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:14,060 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:14,060 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 07:13:14,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724633808] [2021-10-13 07:13:14,061 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:13:14,061 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:14,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:13:14,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:13:14,063 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:14,107 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-10-13 07:13:14,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:13:14,108 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-10-13 07:13:14,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:14,109 INFO L225 Difference]: With dead ends: 46 [2021-10-13 07:13:14,109 INFO L226 Difference]: Without dead ends: 46 [2021-10-13 07:13:14,109 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.5ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:13:14,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-10-13 07:13:14,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-10-13 07:13:14,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 45 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-10-13 07:13:14,119 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 7 [2021-10-13 07:13:14,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:14,122 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-10-13 07:13:14,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,122 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-10-13 07:13:14,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-13 07:13:14,123 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:14,123 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:14,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-13 07:13:14,124 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:14,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:14,126 INFO L82 PathProgramCache]: Analyzing trace with hash 366521266, now seen corresponding path program 1 times [2021-10-13 07:13:14,127 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:14,127 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680754699] [2021-10-13 07:13:14,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:14,128 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:14,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:14,284 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:14,284 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680754699] [2021-10-13 07:13:14,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680754699] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:14,284 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:14,285 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-10-13 07:13:14,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364987047] [2021-10-13 07:13:14,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:13:14,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:14,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:13:14,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:13:14,287 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:14,386 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2021-10-13 07:13:14,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:13:14,387 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 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 7 [2021-10-13 07:13:14,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:14,392 INFO L225 Difference]: With dead ends: 79 [2021-10-13 07:13:14,392 INFO L226 Difference]: Without dead ends: 79 [2021-10-13 07:13:14,393 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 32.4ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:13:14,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-10-13 07:13:14,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 55. [2021-10-13 07:13:14,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 54 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-10-13 07:13:14,415 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 7 [2021-10-13 07:13:14,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:14,415 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-10-13 07:13:14,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,416 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-10-13 07:13:14,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-13 07:13:14,417 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:14,417 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-10-13 07:13:14,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-13 07:13:14,418 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:14,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:14,418 INFO L82 PathProgramCache]: Analyzing trace with hash 368019081, now seen corresponding path program 1 times [2021-10-13 07:13:14,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:14,419 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313813233] [2021-10-13 07:13:14,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:14,419 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:14,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:14,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:14,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:14,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313813233] [2021-10-13 07:13:14,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313813233] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 07:13:14,482 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175584077] [2021-10-13 07:13:14,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:14,482 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:14,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:14,484 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:14,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 07:13:14,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:14,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:14,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:14,716 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 07:13:14,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-10-13 07:13:14,804 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:14,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:14,877 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:14,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175584077] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:14,878 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-13 07:13:14,878 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [3] total 7 [2021-10-13 07:13:14,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990385757] [2021-10-13 07:13:14,879 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 07:13:14,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:14,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 07:13:14,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-13 07:13:14,885 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:14,972 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-10-13 07:13:14,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 07:13:14,973 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 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 7 [2021-10-13 07:13:14,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:14,974 INFO L225 Difference]: With dead ends: 78 [2021-10-13 07:13:14,974 INFO L226 Difference]: Without dead ends: 78 [2021-10-13 07:13:14,975 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 92.3ms TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-10-13 07:13:14,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-10-13 07:13:14,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2021-10-13 07:13:14,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.6578947368421053) internal successors, (63), 53 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) [2021-10-13 07:13:14,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-10-13 07:13:14,991 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 7 [2021-10-13 07:13:14,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:14,992 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-10-13 07:13:14,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:14,992 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-10-13 07:13:14,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-13 07:13:14,993 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:14,993 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:15,032 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-13 07:13:15,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-10-13 07:13:15,209 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:15,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:15,209 INFO L82 PathProgramCache]: Analyzing trace with hash 39678835, now seen corresponding path program 1 times [2021-10-13 07:13:15,210 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:15,210 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596996590] [2021-10-13 07:13:15,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:15,210 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:15,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:15,322 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:15,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:15,322 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596996590] [2021-10-13 07:13:15,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1596996590] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 07:13:15,323 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388879779] [2021-10-13 07:13:15,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:15,323 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:15,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:15,325 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:15,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-13 07:13:15,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:15,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:15,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:15,485 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:15,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:15,536 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:15,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388879779] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:15,537 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-13 07:13:15,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [4] total 9 [2021-10-13 07:13:15,537 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697295237] [2021-10-13 07:13:15,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-10-13 07:13:15,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:15,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-10-13 07:13:15,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-10-13 07:13:15,541 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:15,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:15,581 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2021-10-13 07:13:15,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 07:13:15,582 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 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 9 [2021-10-13 07:13:15,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:15,583 INFO L225 Difference]: With dead ends: 76 [2021-10-13 07:13:15,583 INFO L226 Difference]: Without dead ends: 76 [2021-10-13 07:13:15,584 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 48.6ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-10-13 07:13:15,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-10-13 07:13:15,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 53. [2021-10-13 07:13:15,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 52 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) [2021-10-13 07:13:15,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-10-13 07:13:15,592 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 9 [2021-10-13 07:13:15,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:15,593 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-10-13 07:13:15,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:15,593 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-10-13 07:13:15,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-13 07:13:15,594 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:15,594 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:15,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:15,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-10-13 07:13:15,821 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:15,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:15,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1479091543, now seen corresponding path program 1 times [2021-10-13 07:13:15,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:15,822 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376927575] [2021-10-13 07:13:15,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:15,822 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:15,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:15,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:15,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:15,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376927575] [2021-10-13 07:13:15,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376927575] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 07:13:15,946 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394624448] [2021-10-13 07:13:15,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:15,947 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:15,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:15,948 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:15,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-10-13 07:13:16,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:16,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:13:16,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:16,083 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 07:13:16,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 18 [2021-10-13 07:13:16,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:16,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:16,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394624448] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:16,355 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-10-13 07:13:16,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 11 [2021-10-13 07:13:16,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265635418] [2021-10-13 07:13:16,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 07:13:16,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:16,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 07:13:16,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2021-10-13 07:13:16,362 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:16,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:16,650 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2021-10-13 07:13:16,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 07:13:16,650 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 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 9 [2021-10-13 07:13:16,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:16,651 INFO L225 Difference]: With dead ends: 113 [2021-10-13 07:13:16,651 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 07:13:16,652 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 250.6ms TimeCoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2021-10-13 07:13:16,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 07:13:16,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 52. [2021-10-13 07:13:16,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.5) internal successors, (57), 51 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:16,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2021-10-13 07:13:16,656 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 9 [2021-10-13 07:13:16,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:16,656 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2021-10-13 07:13:16,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:16,656 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2021-10-13 07:13:16,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 07:13:16,657 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:16,657 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:16,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:16,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:16,858 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:16,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:16,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1230114217, now seen corresponding path program 1 times [2021-10-13 07:13:16,858 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:16,858 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623511466] [2021-10-13 07:13:16,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:16,859 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:16,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:16,928 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:16,928 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:16,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623511466] [2021-10-13 07:13:16,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623511466] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:16,931 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:16,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 07:13:16,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376282319] [2021-10-13 07:13:16,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 07:13:16,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:16,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 07:13:16,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 07:13:16,933 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:16,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:16,970 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-10-13 07:13:16,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 07:13:16,970 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2021-10-13 07:13:16,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:16,971 INFO L225 Difference]: With dead ends: 50 [2021-10-13 07:13:16,971 INFO L226 Difference]: Without dead ends: 50 [2021-10-13 07:13:16,971 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:13:16,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-10-13 07:13:16,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-10-13 07:13:16,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 49 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) [2021-10-13 07:13:16,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2021-10-13 07:13:16,976 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 10 [2021-10-13 07:13:16,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:16,977 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2021-10-13 07:13:16,977 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:16,978 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2021-10-13 07:13:16,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 07:13:16,978 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:16,978 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:16,979 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-10-13 07:13:16,979 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:16,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:16,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1230114218, now seen corresponding path program 1 times [2021-10-13 07:13:16,980 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:16,980 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307429864] [2021-10-13 07:13:16,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:16,980 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:17,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:17,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:17,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:17,072 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307429864] [2021-10-13 07:13:17,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307429864] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:17,073 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:17,073 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-13 07:13:17,073 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455748081] [2021-10-13 07:13:17,073 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-13 07:13:17,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 07:13:17,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-13 07:13:17,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:13:17,075 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:17,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:17,123 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-10-13 07:13:17,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 07:13:17,123 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2021-10-13 07:13:17,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:17,124 INFO L225 Difference]: With dead ends: 53 [2021-10-13 07:13:17,124 INFO L226 Difference]: Without dead ends: 53 [2021-10-13 07:13:17,125 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 14.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 07:13:17,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-10-13 07:13:17,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 40. [2021-10-13 07:13:17,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 33 states have (on average 1.3333333333333333) internal successors, (44), 39 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:17,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2021-10-13 07:13:17,127 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 10 [2021-10-13 07:13:17,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:17,128 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2021-10-13 07:13:17,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:17,128 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2021-10-13 07:13:17,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 07:13:17,129 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:17,129 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:17,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-10-13 07:13:17,130 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:17,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:17,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1548611473, now seen corresponding path program 1 times [2021-10-13 07:13:17,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 07:13:17,131 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366568340] [2021-10-13 07:13:17,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:17,131 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 07:13:17,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:17,186 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:17,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 07:13:17,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366568340] [2021-10-13 07:13:17,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366568340] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 07:13:17,187 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533479755] [2021-10-13 07:13:17,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:17,188 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:17,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:17,189 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:17,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-10-13 07:13:17,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:17,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:13:17,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:17,344 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:17,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:17,402 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:17,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533479755] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:17,403 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008285312] [2021-10-13 07:13:17,424 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-10-13 07:13:17,425 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 07:13:17,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 07:13:17,456 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 07:13:17,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 07:13:17,487 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,491 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:13:17,492 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,493 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 32 [2021-10-13 07:13:17,495 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 07:13:17,496 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,496 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-10-13 07:13:17,498 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 107 [2021-10-13 07:13:17,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 07:13:17,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:17,520 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,520 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-13 07:13:17,523 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,523 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-13 07:13:17,524 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 07:13:17,526 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 07:13:17,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,539 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 07:13:17,541 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 105 [2021-10-13 07:13:17,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-10-13 07:13:17,542 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:104, output treesize:105 [2021-10-13 07:13:17,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:17,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:17,769 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#valid_47| at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:83) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.constructTermVarsProc(BasicPredicateFactory.java:92) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.newPredicate(BasicPredicateFactory.java:81) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.predicate(SymbolicTools.java:174) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:116) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:608) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:53) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:392) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-10-13 07:13:17,773 INFO L168 Benchmark]: Toolchain (without parser) took 5834.99 ms. Allocated memory was 113.2 MB in the beginning and 140.5 MB in the end (delta: 27.3 MB). Free memory was 79.3 MB in the beginning and 60.6 MB in the end (delta: 18.7 MB). Peak memory consumption was 45.3 MB. Max. memory is 16.1 GB. [2021-10-13 07:13:17,774 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 113.2 MB. Free memory is still 66.2 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:13:17,774 INFO L168 Benchmark]: CACSL2BoogieTranslator took 536.25 ms. Allocated memory is still 113.2 MB. Free memory was 79.1 MB in the beginning and 81.8 MB in the end (delta: -2.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-13 07:13:17,775 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.00 ms. Allocated memory is still 113.2 MB. Free memory was 81.8 MB in the beginning and 79.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:13:17,775 INFO L168 Benchmark]: Boogie Preprocessor took 39.65 ms. Allocated memory is still 113.2 MB. Free memory was 79.8 MB in the beginning and 78.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:13:17,776 INFO L168 Benchmark]: RCFGBuilder took 546.16 ms. Allocated memory is still 113.2 MB. Free memory was 78.5 MB in the beginning and 64.7 MB in the end (delta: 13.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-10-13 07:13:17,776 INFO L168 Benchmark]: TraceAbstraction took 4651.16 ms. Allocated memory was 113.2 MB in the beginning and 140.5 MB in the end (delta: 27.3 MB). Free memory was 63.9 MB in the beginning and 60.6 MB in the end (delta: 3.2 MB). Peak memory consumption was 31.3 MB. Max. memory is 16.1 GB. [2021-10-13 07:13:17,779 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 113.2 MB. Free memory is still 66.2 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 536.25 ms. Allocated memory is still 113.2 MB. Free memory was 79.1 MB in the beginning and 81.8 MB in the end (delta: -2.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 47.00 ms. Allocated memory is still 113.2 MB. Free memory was 81.8 MB in the beginning and 79.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 39.65 ms. Allocated memory is still 113.2 MB. Free memory was 79.8 MB in the beginning and 78.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 546.16 ms. Allocated memory is still 113.2 MB. Free memory was 78.5 MB in the beginning and 64.7 MB in the end (delta: 13.8 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4651.16 ms. Allocated memory was 113.2 MB in the beginning and 140.5 MB in the end (delta: 27.3 MB). Free memory was 63.9 MB in the beginning and 60.6 MB in the end (delta: 3.2 MB). Peak memory consumption was 31.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#valid_47| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#valid_47|: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermVarsProc.computeTermVarsProc(TermVarsProc.java:97) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-10-13 07:13:17,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 07:13:20,404 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 07:13:20,407 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 07:13:20,455 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 07:13:20,456 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 07:13:20,464 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 07:13:20,466 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 07:13:20,474 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 07:13:20,478 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 07:13:20,484 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 07:13:20,485 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 07:13:20,486 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 07:13:20,487 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 07:13:20,488 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 07:13:20,490 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 07:13:20,491 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 07:13:20,492 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 07:13:20,493 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 07:13:20,495 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 07:13:20,497 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 07:13:20,499 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 07:13:20,500 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 07:13:20,508 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 07:13:20,509 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 07:13:20,513 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 07:13:20,513 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 07:13:20,514 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 07:13:20,515 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 07:13:20,515 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 07:13:20,516 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 07:13:20,517 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 07:13:20,518 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 07:13:20,519 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 07:13:20,520 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 07:13:20,526 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 07:13:20,527 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 07:13:20,545 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 07:13:20,545 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 07:13:20,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 07:13:20,546 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 07:13:20,547 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 07:13:20,548 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-10-13 07:13:20,597 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 07:13:20,599 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 07:13:20,601 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 07:13:20,601 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 07:13:20,601 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 07:13:20,602 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 07:13:20,602 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 07:13:20,602 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 07:13:20,603 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 07:13:20,604 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 07:13:20,605 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 07:13:20,605 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 07:13:20,605 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 07:13:20,605 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 07:13:20,606 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 07:13:20,606 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 07:13:20,606 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 07:13:20,606 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 07:13:20,606 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 07:13:20,607 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 07:13:20,607 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 07:13:20,607 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 07:13:20,607 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 07:13:20,607 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 07:13:20,608 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 07:13:20,608 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 07:13:20,608 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 07:13:20,608 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 07:13:20,608 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 07:13:20,609 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:13:20,609 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 07:13:20,609 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 07:13:20,609 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 07:13:20,610 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:20,610 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 07:13:20,610 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 07:13:20,610 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_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cbc7a588e1092d0916f2339b4d4b9e0fa8415335 [2021-10-13 07:13:21,004 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 07:13:21,030 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 07:13:21,033 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 07:13:21,034 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 07:13:21,035 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 07:13:21,036 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-13 07:13:21,108 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/3bed8f5da/6b8ff6258c784c7096fa7efa423a7c97/FLAG4214e1790 [2021-10-13 07:13:21,744 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 07:13:21,745 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/sv-benchmarks/c/list-ext-properties/960521-1_1-3.i [2021-10-13 07:13:21,758 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/3bed8f5da/6b8ff6258c784c7096fa7efa423a7c97/FLAG4214e1790 [2021-10-13 07:13:21,978 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/data/3bed8f5da/6b8ff6258c784c7096fa7efa423a7c97 [2021-10-13 07:13:21,981 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 07:13:21,982 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 07:13:21,984 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 07:13:21,984 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 07:13:21,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 07:13:21,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:13:21" (1/1) ... [2021-10-13 07:13:21,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37097e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:21, skipping insertion in model container [2021-10-13 07:13:21,996 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:13:21" (1/1) ... [2021-10-13 07:13:22,006 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 07:13:22,053 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 07:13:22,400 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:13:22,412 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 07:13:22,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 07:13:22,491 INFO L208 MainTranslator]: Completed translation [2021-10-13 07:13:22,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22 WrapperNode [2021-10-13 07:13:22,492 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 07:13:22,493 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 07:13:22,493 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 07:13:22,493 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 07:13:22,501 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,521 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,557 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 07:13:22,559 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 07:13:22,559 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 07:13:22,559 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 07:13:22,567 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,568 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,590 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,590 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,598 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,617 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,619 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,633 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 07:13:22,634 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 07:13:22,634 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 07:13:22,634 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 07:13:22,635 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (1/1) ... [2021-10-13 07:13:22,642 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 07:13:22,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:22,678 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 07:13:22,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 07:13:22,733 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-10-13 07:13:22,734 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-13 07:13:22,734 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 07:13:22,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 07:13:22,734 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-10-13 07:13:22,734 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-10-13 07:13:22,734 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 07:13:22,735 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 07:13:23,250 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 07:13:23,254 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-10-13 07:13:23,257 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:13:23 BoogieIcfgContainer [2021-10-13 07:13:23,257 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 07:13:23,259 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 07:13:23,260 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 07:13:23,275 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 07:13:23,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:13:21" (1/3) ... [2021-10-13 07:13:23,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6882cc47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:13:23, skipping insertion in model container [2021-10-13 07:13:23,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:13:22" (2/3) ... [2021-10-13 07:13:23,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6882cc47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:13:23, skipping insertion in model container [2021-10-13 07:13:23,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:13:23" (3/3) ... [2021-10-13 07:13:23,279 INFO L111 eAbstractionObserver]: Analyzing ICFG 960521-1_1-3.i [2021-10-13 07:13:23,285 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 07:13:23,285 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2021-10-13 07:13:23,333 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 07:13:23,340 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=false, mConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 [2021-10-13 07:13:23,340 INFO L340 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2021-10-13 07:13:23,356 INFO L276 IsEmpty]: Start isEmpty. Operand has 52 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 51 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:23,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-13 07:13:23,363 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:23,363 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-13 07:13:23,364 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:23,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:23,370 INFO L82 PathProgramCache]: Analyzing trace with hash 28697864, now seen corresponding path program 1 times [2021-10-13 07:13:23,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:23,383 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382256654] [2021-10-13 07:13:23,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:23,385 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:23,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:23,388 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:23,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 07:13:23,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:23,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-13 07:13:23,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:23,563 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-13 07:13:23,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 14 [2021-10-13 07:13:23,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:23,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:23,618 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:23,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382256654] [2021-10-13 07:13:23,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382256654] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:23,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:23,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 07:13:23,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769559262] [2021-10-13 07:13:23,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:13:23,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:23,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:13:23,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:23,645 INFO L87 Difference]: Start difference. First operand has 52 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 51 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:23,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:23,727 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2021-10-13 07:13:23,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:13:23,729 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 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 5 [2021-10-13 07:13:23,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:23,738 INFO L225 Difference]: With dead ends: 51 [2021-10-13 07:13:23,738 INFO L226 Difference]: Without dead ends: 49 [2021-10-13 07:13:23,739 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:23,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-10-13 07:13:23,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-10-13 07:13:23,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 29 states have (on average 1.793103448275862) internal successors, (52), 48 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) [2021-10-13 07:13:23,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-10-13 07:13:23,773 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 5 [2021-10-13 07:13:23,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:23,773 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-10-13 07:13:23,773 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:23,774 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-10-13 07:13:23,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-13 07:13:23,774 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:23,775 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-10-13 07:13:23,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:23,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:23,979 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:23,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:23,980 INFO L82 PathProgramCache]: Analyzing trace with hash 28697865, now seen corresponding path program 1 times [2021-10-13 07:13:23,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:23,981 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [317486986] [2021-10-13 07:13:23,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:23,982 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:23,982 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:23,983 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:24,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 07:13:24,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:24,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:24,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:24,149 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:24,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:24,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:24,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:24,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:24,311 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:24,311 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [317486986] [2021-10-13 07:13:24,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [317486986] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:24,324 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:24,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 07:13:24,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071627575] [2021-10-13 07:13:24,326 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:13:24,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:24,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:13:24,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:13:24,329 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:24,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:24,599 INFO L93 Difference]: Finished difference Result 141 states and 150 transitions. [2021-10-13 07:13:24,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 07:13:24,600 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 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 5 [2021-10-13 07:13:24,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:24,605 INFO L225 Difference]: With dead ends: 141 [2021-10-13 07:13:24,606 INFO L226 Difference]: Without dead ends: 141 [2021-10-13 07:13:24,608 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 131.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:13:24,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-10-13 07:13:24,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 53. [2021-10-13 07:13:24,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 52 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:24,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2021-10-13 07:13:24,619 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 5 [2021-10-13 07:13:24,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:24,619 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2021-10-13 07:13:24,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:24,620 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2021-10-13 07:13:24,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-13 07:13:24,621 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:24,621 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-10-13 07:13:24,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:24,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:24,847 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:24,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:24,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1810564201, now seen corresponding path program 1 times [2021-10-13 07:13:24,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:24,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1697791264] [2021-10-13 07:13:24,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:24,857 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:24,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:24,858 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:24,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 07:13:24,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:24,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:24,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:25,020 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:25,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:25,056 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:25,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:25,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:25,209 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:25,209 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1697791264] [2021-10-13 07:13:25,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1697791264] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:25,210 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2030151794] [2021-10-13 07:13:25,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:25,210 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:25,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:25,214 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:25,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-10-13 07:13:25,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:25,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:25,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:25,394 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:25,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:25,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:25,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:25,457 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:25,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2030151794] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:25,457 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474160812] [2021-10-13 07:13:25,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:25,458 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:25,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:25,460 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:25,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-10-13 07:13:25,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:25,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:25,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:25,611 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:25,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:25,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:25,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:25,703 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:25,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474160812] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:25,704 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:25,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 9 [2021-10-13 07:13:25,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478531194] [2021-10-13 07:13:25,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 07:13:25,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:25,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 07:13:25,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-10-13 07:13:25,709 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:26,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:26,561 INFO L93 Difference]: Finished difference Result 325 states and 346 transitions. [2021-10-13 07:13:26,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-10-13 07:13:26,562 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 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 7 [2021-10-13 07:13:26,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:26,565 INFO L225 Difference]: With dead ends: 325 [2021-10-13 07:13:26,565 INFO L226 Difference]: Without dead ends: 325 [2021-10-13 07:13:26,567 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 463.1ms TimeCoverageRelationStatistics Valid=113, Invalid=229, Unknown=0, NotChecked=0, Total=342 [2021-10-13 07:13:26,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2021-10-13 07:13:26,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 57. [2021-10-13 07:13:26,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 56 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:26,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 66 transitions. [2021-10-13 07:13:26,578 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 66 transitions. Word has length 7 [2021-10-13 07:13:26,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:26,579 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 66 transitions. [2021-10-13 07:13:26,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:26,579 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 66 transitions. [2021-10-13 07:13:26,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:13:26,580 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:26,580 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:26,600 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:26,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:26,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:27,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:27,193 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:27,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:27,194 INFO L82 PathProgramCache]: Analyzing trace with hash 239563854, now seen corresponding path program 1 times [2021-10-13 07:13:27,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:27,195 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1940945891] [2021-10-13 07:13:27,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:27,195 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:27,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:27,197 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:27,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-13 07:13:27,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:27,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-13 07:13:27,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:27,348 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-13 07:13:27,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 14 [2021-10-13 07:13:27,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:27,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:27,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:27,422 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:27,422 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1940945891] [2021-10-13 07:13:27,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1940945891] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:27,422 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:27,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 07:13:27,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101877825] [2021-10-13 07:13:27,423 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:13:27,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:27,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:13:27,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:27,425 INFO L87 Difference]: Start difference. First operand 57 states and 66 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:27,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:27,488 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-10-13 07:13:27,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:13:27,489 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-10-13 07:13:27,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:27,491 INFO L225 Difference]: With dead ends: 54 [2021-10-13 07:13:27,491 INFO L226 Difference]: Without dead ends: 54 [2021-10-13 07:13:27,491 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:27,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-10-13 07:13:27,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-10-13 07:13:27,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 53 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) [2021-10-13 07:13:27,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-10-13 07:13:27,497 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 8 [2021-10-13 07:13:27,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:27,497 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-10-13 07:13:27,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:27,498 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-10-13 07:13:27,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 07:13:27,498 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:27,498 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:27,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:27,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:27,699 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:27,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:27,699 INFO L82 PathProgramCache]: Analyzing trace with hash 239563855, now seen corresponding path program 1 times [2021-10-13 07:13:27,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:27,700 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2134544552] [2021-10-13 07:13:27,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:27,700 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:27,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:27,701 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:27,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-13 07:13:27,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:27,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2021-10-13 07:13:27,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:27,848 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:27,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:27,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:27,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:28,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:28,236 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:28,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2134544552] [2021-10-13 07:13:28,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2134544552] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:28,236 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:28,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-10-13 07:13:28,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69052241] [2021-10-13 07:13:28,237 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 07:13:28,237 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:28,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 07:13:28,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:13:28,238 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:29,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:29,226 INFO L93 Difference]: Finished difference Result 172 states and 186 transitions. [2021-10-13 07:13:29,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-13 07:13:29,227 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 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 8 [2021-10-13 07:13:29,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:29,228 INFO L225 Difference]: With dead ends: 172 [2021-10-13 07:13:29,229 INFO L226 Difference]: Without dead ends: 172 [2021-10-13 07:13:29,229 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 383.6ms TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2021-10-13 07:13:29,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-10-13 07:13:29,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 73. [2021-10-13 07:13:29,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 56 states have (on average 1.5714285714285714) internal successors, (88), 72 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:29,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2021-10-13 07:13:29,237 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 8 [2021-10-13 07:13:29,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:29,237 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2021-10-13 07:13:29,237 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:29,238 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2021-10-13 07:13:29,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 07:13:29,238 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:29,239 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:29,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:29,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:29,454 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:29,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:29,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1976198929, now seen corresponding path program 1 times [2021-10-13 07:13:29,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:29,455 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [76639256] [2021-10-13 07:13:29,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:29,455 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:29,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:29,456 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:29,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-10-13 07:13:29,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:29,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 07:13:29,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:29,630 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:29,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:29,720 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:29,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:30,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:30,124 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:30,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [76639256] [2021-10-13 07:13:30,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [76639256] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:30,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1416934386] [2021-10-13 07:13:30,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:30,125 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:30,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:30,129 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:30,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-10-13 07:13:30,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:30,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:13:30,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:30,383 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:30,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-10-13 07:13:30,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-10-13 07:13:30,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:30,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:30,738 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:30,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1416934386] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:30,739 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813737335] [2021-10-13 07:13:30,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:30,739 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:30,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:30,740 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:30,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-10-13 07:13:30,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:30,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 07:13:30,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:30,897 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:30,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:30,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:30,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:31,078 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:31,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813737335] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:31,078 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:31,078 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 13 [2021-10-13 07:13:31,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498727151] [2021-10-13 07:13:31,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 07:13:31,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:31,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 07:13:31,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-10-13 07:13:31,080 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:33,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:33,949 INFO L93 Difference]: Finished difference Result 489 states and 519 transitions. [2021-10-13 07:13:33,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-10-13 07:13:33,950 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 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 10 [2021-10-13 07:13:33,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:33,953 INFO L225 Difference]: With dead ends: 489 [2021-10-13 07:13:33,953 INFO L226 Difference]: Without dead ends: 489 [2021-10-13 07:13:33,954 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 1277.0ms TimeCoverageRelationStatistics Valid=242, Invalid=628, Unknown=0, NotChecked=0, Total=870 [2021-10-13 07:13:33,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-10-13 07:13:33,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 87. [2021-10-13 07:13:33,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 70 states have (on average 1.542857142857143) internal successors, (108), 86 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:33,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 108 transitions. [2021-10-13 07:13:33,964 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 108 transitions. Word has length 10 [2021-10-13 07:13:33,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:33,965 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 108 transitions. [2021-10-13 07:13:33,965 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:33,965 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 108 transitions. [2021-10-13 07:13:33,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:13:33,966 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:33,966 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:33,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:34,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:34,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:34,578 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:34,578 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:34,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:34,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1388869610, now seen corresponding path program 1 times [2021-10-13 07:13:34,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:34,580 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [921573249] [2021-10-13 07:13:34,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:34,580 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:34,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:34,581 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:34,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-10-13 07:13:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:34,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:34,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:34,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:34,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:34,846 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:34,846 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:34,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [921573249] [2021-10-13 07:13:34,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [921573249] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:34,847 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2124796819] [2021-10-13 07:13:34,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:34,847 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:34,847 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:34,848 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:34,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-10-13 07:13:35,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:35,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:35,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:35,098 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:35,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:35,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:35,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2124796819] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:35,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344943168] [2021-10-13 07:13:35,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:35,150 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:35,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:35,153 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:35,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 07:13:35,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:35,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:35,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:35,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:35,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:35,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:35,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344943168] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:35,407 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:35,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-10-13 07:13:35,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27396569] [2021-10-13 07:13:35,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 07:13:35,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:35,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 07:13:35,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:13:35,408 INFO L87 Difference]: Start difference. First operand 87 states and 108 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:35,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:35,513 INFO L93 Difference]: Finished difference Result 113 states and 132 transitions. [2021-10-13 07:13:35,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 07:13:35,515 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 0 states have call successors, (0), 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 11 [2021-10-13 07:13:35,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:35,516 INFO L225 Difference]: With dead ends: 113 [2021-10-13 07:13:35,516 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 07:13:35,517 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:13:35,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 07:13:35,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 86. [2021-10-13 07:13:35,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 69 states have (on average 1.5217391304347827) internal successors, (105), 85 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:35,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 105 transitions. [2021-10-13 07:13:35,522 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 105 transitions. Word has length 11 [2021-10-13 07:13:35,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:35,523 INFO L470 AbstractCegarLoop]: Abstraction has 86 states and 105 transitions. [2021-10-13 07:13:35,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:35,523 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 105 transitions. [2021-10-13 07:13:35,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:13:35,524 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:35,524 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:35,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:35,773 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:35,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:36,145 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:36,146 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:36,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:36,146 INFO L82 PathProgramCache]: Analyzing trace with hash 738364296, now seen corresponding path program 1 times [2021-10-13 07:13:36,146 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:36,146 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1135608821] [2021-10-13 07:13:36,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:36,147 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:36,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:36,151 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:36,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-10-13 07:13:36,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:36,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:36,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:36,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:36,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:36,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:36,423 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:36,423 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1135608821] [2021-10-13 07:13:36,423 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1135608821] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:36,424 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [117935169] [2021-10-13 07:13:36,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:36,424 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:36,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:36,426 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:36,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-10-13 07:13:36,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:36,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:36,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:36,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:36,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:36,735 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:36,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [117935169] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:36,736 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852153527] [2021-10-13 07:13:36,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:36,736 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:36,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:36,737 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:36,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-10-13 07:13:36,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:36,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 07:13:36,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:36,953 INFO L354 Elim1Store]: treesize reduction 12, result has 40.0 percent of original size [2021-10-13 07:13:36,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 14 [2021-10-13 07:13:37,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:37,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:37,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:37,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852153527] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:37,047 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-10-13 07:13:37,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [5, 5, 5, 5] total 9 [2021-10-13 07:13:37,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726819884] [2021-10-13 07:13:37,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:13:37,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:37,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:13:37,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-13 07:13:37,049 INFO L87 Difference]: Start difference. First operand 86 states and 105 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:37,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:37,105 INFO L93 Difference]: Finished difference Result 84 states and 101 transitions. [2021-10-13 07:13:37,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:13:37,106 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-10-13 07:13:37,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:37,107 INFO L225 Difference]: With dead ends: 84 [2021-10-13 07:13:37,107 INFO L226 Difference]: Without dead ends: 84 [2021-10-13 07:13:37,107 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 72.9ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-10-13 07:13:37,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-10-13 07:13:37,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-10-13 07:13:37,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 69 states have (on average 1.463768115942029) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:37,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-10-13 07:13:37,113 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 11 [2021-10-13 07:13:37,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:37,113 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-10-13 07:13:37,114 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:37,114 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-10-13 07:13:37,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:13:37,115 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:37,115 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:37,140 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:37,328 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:37,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:37,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:37,716 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:37,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:37,716 INFO L82 PathProgramCache]: Analyzing trace with hash 738364297, now seen corresponding path program 1 times [2021-10-13 07:13:37,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:37,717 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1237957864] [2021-10-13 07:13:37,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:37,717 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:37,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:37,718 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:37,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-10-13 07:13:37,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:37,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:37,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:37,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:37,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:37,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:37,968 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:37,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1237957864] [2021-10-13 07:13:37,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1237957864] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:37,969 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1590978056] [2021-10-13 07:13:37,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:37,969 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:37,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:37,970 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:37,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-10-13 07:13:38,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:38,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:38,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:38,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:38,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:38,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:38,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1590978056] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:38,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390411304] [2021-10-13 07:13:38,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:38,253 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:38,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:38,260 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:38,282 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-10-13 07:13:38,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:38,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2021-10-13 07:13:38,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:38,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:38,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:38,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:38,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390411304] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:38,578 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:38,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 10 [2021-10-13 07:13:38,578 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275858201] [2021-10-13 07:13:38,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 07:13:38,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:38,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 07:13:38,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-10-13 07:13:38,580 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:39,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:39,073 INFO L93 Difference]: Finished difference Result 164 states and 181 transitions. [2021-10-13 07:13:39,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-13 07:13:39,081 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 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 11 [2021-10-13 07:13:39,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:39,082 INFO L225 Difference]: With dead ends: 164 [2021-10-13 07:13:39,082 INFO L226 Difference]: Without dead ends: 164 [2021-10-13 07:13:39,083 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 233.5ms TimeCoverageRelationStatistics Valid=82, Invalid=158, Unknown=0, NotChecked=0, Total=240 [2021-10-13 07:13:39,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-10-13 07:13:39,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 89. [2021-10-13 07:13:39,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 74 states have (on average 1.4189189189189189) internal successors, (105), 88 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:39,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 105 transitions. [2021-10-13 07:13:39,088 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 105 transitions. Word has length 11 [2021-10-13 07:13:39,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:39,088 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 105 transitions. [2021-10-13 07:13:39,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:39,089 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 105 transitions. [2021-10-13 07:13:39,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 07:13:39,089 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:39,090 INFO L512 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1] [2021-10-13 07:13:39,135 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:39,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:39,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:39,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:39,705 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:39,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:39,705 INFO L82 PathProgramCache]: Analyzing trace with hash 522992425, now seen corresponding path program 2 times [2021-10-13 07:13:39,706 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:39,706 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1895356346] [2021-10-13 07:13:39,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:39,706 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:39,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:39,707 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:39,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-10-13 07:13:39,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:13:39,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:39,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:13:39,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:39,983 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:39,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:40,021 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:40,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:40,307 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:40,307 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:40,307 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1895356346] [2021-10-13 07:13:40,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1895356346] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:40,307 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1088960584] [2021-10-13 07:13:40,308 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:40,308 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:40,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:40,316 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:40,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-10-13 07:13:40,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:13:40,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:40,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:13:40,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:40,688 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:40,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:40,697 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:40,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:40,759 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:40,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1088960584] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:40,759 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [732864485] [2021-10-13 07:13:40,759 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:40,760 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:40,760 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:40,761 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:40,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-10-13 07:13:40,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:13:40,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:40,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:13:40,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:41,028 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:41,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:41,039 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:41,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:41,100 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:41,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [732864485] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:41,100 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:41,100 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 17 [2021-10-13 07:13:41,101 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104431233] [2021-10-13 07:13:41,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-13 07:13:41,101 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:41,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-13 07:13:41,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=223, Unknown=0, NotChecked=0, Total=306 [2021-10-13 07:13:41,102 INFO L87 Difference]: Start difference. First operand 89 states and 105 transitions. Second operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:43,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:43,114 INFO L93 Difference]: Finished difference Result 682 states and 734 transitions. [2021-10-13 07:13:43,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-10-13 07:13:43,115 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 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 11 [2021-10-13 07:13:43,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:43,119 INFO L225 Difference]: With dead ends: 682 [2021-10-13 07:13:43,119 INFO L226 Difference]: Without dead ends: 682 [2021-10-13 07:13:43,120 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1242.5ms TimeCoverageRelationStatistics Valid=463, Invalid=1019, Unknown=0, NotChecked=0, Total=1482 [2021-10-13 07:13:43,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-10-13 07:13:43,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 99. [2021-10-13 07:13:43,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 84 states have (on average 1.4642857142857142) internal successors, (123), 98 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:43,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 123 transitions. [2021-10-13 07:13:43,129 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 123 transitions. Word has length 11 [2021-10-13 07:13:43,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:43,129 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 123 transitions. [2021-10-13 07:13:43,130 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:43,130 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 123 transitions. [2021-10-13 07:13:43,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 07:13:43,131 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:43,131 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:43,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:43,356 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (21)] Ended with exit code 0 [2021-10-13 07:13:43,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:43,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:43,749 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:43,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:43,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1416054993, now seen corresponding path program 1 times [2021-10-13 07:13:43,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:43,750 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1522145285] [2021-10-13 07:13:43,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:43,750 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:43,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:43,751 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:43,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-10-13 07:13:43,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:43,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 07:13:43,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:44,013 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:44,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:44,153 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:44,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:44,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:44,630 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:44,630 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1522145285] [2021-10-13 07:13:44,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1522145285] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:44,630 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1395104968] [2021-10-13 07:13:44,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:44,630 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:44,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:44,631 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:44,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-10-13 07:13:44,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:44,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:13:44,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:44,998 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:44,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-10-13 07:13:45,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-10-13 07:13:45,285 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:45,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:45,488 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:45,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1395104968] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:45,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195529230] [2021-10-13 07:13:45,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:45,489 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:45,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:45,492 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:45,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-10-13 07:13:45,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:45,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:13:45,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:45,734 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:45,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:45,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:45,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:46,405 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:46,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195529230] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:46,406 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:46,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 7] total 18 [2021-10-13 07:13:46,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857297438] [2021-10-13 07:13:46,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-10-13 07:13:46,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:46,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-10-13 07:13:46,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-10-13 07:13:46,408 INFO L87 Difference]: Start difference. First operand 99 states and 123 transitions. Second operand has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:52,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:52,149 INFO L93 Difference]: Finished difference Result 364 states and 394 transitions. [2021-10-13 07:13:52,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-10-13 07:13:52,150 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 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 12 [2021-10-13 07:13:52,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:52,152 INFO L225 Difference]: With dead ends: 364 [2021-10-13 07:13:52,152 INFO L226 Difference]: Without dead ends: 364 [2021-10-13 07:13:52,153 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 2987.3ms TimeCoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2021-10-13 07:13:52,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-10-13 07:13:52,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 128. [2021-10-13 07:13:52,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 113 states have (on average 1.3982300884955752) internal successors, (158), 127 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:52,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 158 transitions. [2021-10-13 07:13:52,160 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 158 transitions. Word has length 12 [2021-10-13 07:13:52,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:52,161 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 158 transitions. [2021-10-13 07:13:52,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 19 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:52,161 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 158 transitions. [2021-10-13 07:13:52,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-10-13 07:13:52,162 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:52,162 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:52,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-10-13 07:13:52,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-10-13 07:13:52,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-10-13 07:13:52,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:52,765 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:52,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:52,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1031081387, now seen corresponding path program 1 times [2021-10-13 07:13:52,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:52,766 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1129410537] [2021-10-13 07:13:52,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:52,766 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:52,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:52,767 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:52,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-10-13 07:13:52,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:52,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:52,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:52,999 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:53,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:53,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:53,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:53,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:53,219 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:53,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1129410537] [2021-10-13 07:13:53,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1129410537] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:53,219 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:53,219 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 07:13:53,219 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584097583] [2021-10-13 07:13:53,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 07:13:53,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:53,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 07:13:53,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-13 07:13:53,220 INFO L87 Difference]: Start difference. First operand 128 states and 158 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:53,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:53,418 INFO L93 Difference]: Finished difference Result 148 states and 173 transitions. [2021-10-13 07:13:53,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 07:13:53,419 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 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 13 [2021-10-13 07:13:53,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:53,420 INFO L225 Difference]: With dead ends: 148 [2021-10-13 07:13:53,420 INFO L226 Difference]: Without dead ends: 148 [2021-10-13 07:13:53,420 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 62.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:13:53,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-10-13 07:13:53,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 118. [2021-10-13 07:13:53,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 108 states have (on average 1.3611111111111112) internal successors, (147), 117 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:53,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 147 transitions. [2021-10-13 07:13:53,424 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 147 transitions. Word has length 13 [2021-10-13 07:13:53,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:53,425 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 147 transitions. [2021-10-13 07:13:53,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:53,425 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 147 transitions. [2021-10-13 07:13:53,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-10-13 07:13:53,426 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:53,426 INFO L512 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:53,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:53,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:53,637 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:53,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:53,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1674057169, now seen corresponding path program 2 times [2021-10-13 07:13:53,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:53,638 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1507612042] [2021-10-13 07:13:53,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:53,639 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:53,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:53,639 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:53,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-10-13 07:13:53,839 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-10-13 07:13:53,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:53,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:53,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:53,883 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-10-13 07:13:53,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 15 [2021-10-13 07:13:54,088 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-13 07:13:54,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:54,398 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-10-13 07:13:54,398 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:54,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1507612042] [2021-10-13 07:13:54,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1507612042] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:54,399 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:54,399 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-10-13 07:13:54,399 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071204521] [2021-10-13 07:13:54,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 07:13:54,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:54,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 07:13:54,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-10-13 07:13:54,400 INFO L87 Difference]: Start difference. First operand 118 states and 147 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:54,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:54,702 INFO L93 Difference]: Finished difference Result 136 states and 164 transitions. [2021-10-13 07:13:54,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 07:13:54,703 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 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 14 [2021-10-13 07:13:54,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:54,704 INFO L225 Difference]: With dead ends: 136 [2021-10-13 07:13:54,704 INFO L226 Difference]: Without dead ends: 136 [2021-10-13 07:13:54,704 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 273.5ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-10-13 07:13:54,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-10-13 07:13:54,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 91. [2021-10-13 07:13:54,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 83 states have (on average 1.3614457831325302) internal successors, (113), 90 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:54,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2021-10-13 07:13:54,708 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 14 [2021-10-13 07:13:54,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:54,708 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2021-10-13 07:13:54,708 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:54,708 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2021-10-13 07:13:54,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-10-13 07:13:54,709 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:54,709 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:54,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-10-13 07:13:54,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:54,912 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:54,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:54,913 INFO L82 PathProgramCache]: Analyzing trace with hash 525487188, now seen corresponding path program 2 times [2021-10-13 07:13:54,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:54,913 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [329360641] [2021-10-13 07:13:54,913 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:54,914 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:54,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:54,915 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:54,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-10-13 07:13:55,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:13:55,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:55,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:55,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:55,268 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:55,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:55,406 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:55,406 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:55,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [329360641] [2021-10-13 07:13:55,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [329360641] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:55,406 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [812893998] [2021-10-13 07:13:55,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:55,407 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:55,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:55,409 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:55,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-10-13 07:13:55,774 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:13:55,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:55,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:55,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:55,858 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:55,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:55,917 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:55,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [812893998] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:55,918 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961378562] [2021-10-13 07:13:55,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 07:13:55,918 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:13:55,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:13:55,919 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:13:55,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-10-13 07:13:56,187 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 07:13:56,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:56,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 07:13:56,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:56,262 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:56,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:56,319 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:56,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961378562] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:56,319 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:13:56,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-10-13 07:13:56,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162904627] [2021-10-13 07:13:56,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-10-13 07:13:56,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:56,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-10-13 07:13:56,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-10-13 07:13:56,321 INFO L87 Difference]: Start difference. First operand 91 states and 113 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:56,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:56,543 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2021-10-13 07:13:56,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-10-13 07:13:56,544 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 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 15 [2021-10-13 07:13:56,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:56,545 INFO L225 Difference]: With dead ends: 113 [2021-10-13 07:13:56,545 INFO L226 Difference]: Without dead ends: 113 [2021-10-13 07:13:56,546 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 145.9ms TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2021-10-13 07:13:56,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-10-13 07:13:56,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 84. [2021-10-13 07:13:56,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 76 states have (on average 1.3289473684210527) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:56,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-10-13 07:13:56,549 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 15 [2021-10-13 07:13:56,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:56,549 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-10-13 07:13:56,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:56,550 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-10-13 07:13:56,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-13 07:13:56,550 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:56,551 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:56,559 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-10-13 07:13:56,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2021-10-13 07:13:56,958 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (30)] Ended with exit code 0 [2021-10-13 07:13:57,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:57,157 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:57,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:57,157 INFO L82 PathProgramCache]: Analyzing trace with hash -660488896, now seen corresponding path program 1 times [2021-10-13 07:13:57,158 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:57,158 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [864943051] [2021-10-13 07:13:57,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:13:57,158 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:57,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:57,166 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:57,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-10-13 07:13:57,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:13:57,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 2 conjunts are in the unsatisfiable core [2021-10-13 07:13:57,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:57,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:57,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:57,476 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-10-13 07:13:57,476 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:57,477 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [864943051] [2021-10-13 07:13:57,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [864943051] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 07:13:57,477 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 07:13:57,477 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 07:13:57,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560326946] [2021-10-13 07:13:57,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 07:13:57,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:13:57,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 07:13:57,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:57,478 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 3 states, 2 states have (on average 8.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:57,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:13:57,508 INFO L93 Difference]: Finished difference Result 82 states and 99 transitions. [2021-10-13 07:13:57,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 07:13:57,508 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 8.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 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 16 [2021-10-13 07:13:57,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:13:57,509 INFO L225 Difference]: With dead ends: 82 [2021-10-13 07:13:57,509 INFO L226 Difference]: Without dead ends: 82 [2021-10-13 07:13:57,509 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 07:13:57,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-10-13 07:13:57,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-10-13 07:13:57,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 76 states have (on average 1.3026315789473684) internal successors, (99), 81 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:57,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 99 transitions. [2021-10-13 07:13:57,512 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 99 transitions. Word has length 16 [2021-10-13 07:13:57,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:13:57,513 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 99 transitions. [2021-10-13 07:13:57,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 8.0) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:13:57,513 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 99 transitions. [2021-10-13 07:13:57,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-13 07:13:57,514 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:13:57,514 INFO L512 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:13:57,530 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-10-13 07:13:57,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:13:57,726 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:13:57,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:13:57,726 INFO L82 PathProgramCache]: Analyzing trace with hash 854407055, now seen corresponding path program 3 times [2021-10-13 07:13:57,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:13:57,727 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [560281850] [2021-10-13 07:13:57,727 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:13:57,727 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:13:57,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:13:57,728 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:13:57,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-10-13 07:13:57,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 07:13:57,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:13:57,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 07:13:57,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:13:58,024 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:13:58,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:13:58,197 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:58,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:13:59,777 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:13:59,778 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:13:59,778 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [560281850] [2021-10-13 07:13:59,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [560281850] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:13:59,778 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2054090315] [2021-10-13 07:13:59,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:13:59,778 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:13:59,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:13:59,780 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:13:59,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-10-13 07:14:00,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 07:14:00,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:14:00,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 07:14:00,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:00,321 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:00,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 22 [2021-10-13 07:14:00,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-10-13 07:14:00,752 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:00,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:01,336 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:01,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2054090315] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:01,336 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927042180] [2021-10-13 07:14:01,336 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 07:14:01,336 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:14:01,337 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:14:01,341 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:14:01,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-10-13 07:14:01,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-10-13 07:14:01,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:14:01,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 07:14:01,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:01,728 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:01,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:14:01,822 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:01,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:02,632 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:02,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927042180] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:02,633 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:14:02,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 9, 8, 9] total 23 [2021-10-13 07:14:02,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051960467] [2021-10-13 07:14:02,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-13 07:14:02,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:14:02,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-13 07:14:02,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-10-13 07:14:02,634 INFO L87 Difference]: Start difference. First operand 82 states and 99 transitions. Second operand has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:16,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:16,891 INFO L93 Difference]: Finished difference Result 315 states and 339 transitions. [2021-10-13 07:14:16,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-10-13 07:14:16,891 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-10-13 07:14:16,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:16,893 INFO L225 Difference]: With dead ends: 315 [2021-10-13 07:14:16,893 INFO L226 Difference]: Without dead ends: 315 [2021-10-13 07:14:16,902 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 988 ImplicationChecksByTransitivity, 7982.9ms TimeCoverageRelationStatistics Valid=711, Invalid=2829, Unknown=0, NotChecked=0, Total=3540 [2021-10-13 07:14:16,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2021-10-13 07:14:16,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 124. [2021-10-13 07:14:16,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 118 states have (on average 1.2796610169491525) internal successors, (151), 123 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:16,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 151 transitions. [2021-10-13 07:14:16,908 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 151 transitions. Word has length 16 [2021-10-13 07:14:16,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:16,909 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 151 transitions. [2021-10-13 07:14:16,909 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 24 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:16,909 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 151 transitions. [2021-10-13 07:14:16,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-10-13 07:14:16,910 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:16,910 INFO L512 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:16,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:17,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:17,338 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-10-13 07:14:17,537 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:14:17,537 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:14:17,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:17,537 INFO L82 PathProgramCache]: Analyzing trace with hash -283489775, now seen corresponding path program 4 times [2021-10-13 07:14:17,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:17,537 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1863370712] [2021-10-13 07:14:17,538 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 07:14:17,538 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:17,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:17,539 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:17,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-10-13 07:14:17,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 07:14:17,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:14:17,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 07:14:17,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:18,058 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:18,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:14:18,208 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:18,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:19,140 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:19,140 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:14:19,140 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1863370712] [2021-10-13 07:14:19,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1863370712] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:19,141 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1096005857] [2021-10-13 07:14:19,141 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 07:14:19,141 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:14:19,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:14:19,141 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:14:19,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-10-13 07:14:19,705 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 07:14:19,705 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:14:19,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 07:14:19,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:19,756 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:19,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2021-10-13 07:14:19,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-10-13 07:14:20,072 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:20,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:20,232 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:20,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1096005857] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:20,232 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323775667] [2021-10-13 07:14:20,233 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-10-13 07:14:20,233 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:14:20,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:14:20,233 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:14:20,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-10-13 07:14:20,618 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-10-13 07:14:20,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 07:14:20,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 07:14:20,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:20,667 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:20,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:14:20,732 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:20,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:21,794 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 07:14:21,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323775667] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:21,794 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:14:21,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 11] total 30 [2021-10-13 07:14:21,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823598990] [2021-10-13 07:14:21,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-10-13 07:14:21,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:14:21,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-10-13 07:14:21,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=755, Unknown=0, NotChecked=0, Total=930 [2021-10-13 07:14:21,796 INFO L87 Difference]: Start difference. First operand 124 states and 151 transitions. Second operand has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:47,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:47,420 INFO L93 Difference]: Finished difference Result 674 states and 706 transitions. [2021-10-13 07:14:47,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-10-13 07:14:47,421 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-10-13 07:14:47,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:47,424 INFO L225 Difference]: With dead ends: 674 [2021-10-13 07:14:47,424 INFO L226 Difference]: Without dead ends: 674 [2021-10-13 07:14:47,426 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2743 ImplicationChecksByTransitivity, 13585.5ms TimeCoverageRelationStatistics Valid=2257, Invalid=7055, Unknown=0, NotChecked=0, Total=9312 [2021-10-13 07:14:47,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-10-13 07:14:47,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 144. [2021-10-13 07:14:47,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 138 states have (on average 1.2681159420289856) internal successors, (175), 143 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:47,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 175 transitions. [2021-10-13 07:14:47,453 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 175 transitions. Word has length 16 [2021-10-13 07:14:47,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:47,453 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 175 transitions. [2021-10-13 07:14:47,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.7) internal successors, (51), 31 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:47,453 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 175 transitions. [2021-10-13 07:14:47,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-10-13 07:14:47,454 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:47,455 INFO L512 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:47,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:47,687 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-10-13 07:14:47,868 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:48,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 07:14:48,066 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:14:48,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:48,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1813005665, now seen corresponding path program 1 times [2021-10-13 07:14:48,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:48,067 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [147112274] [2021-10-13 07:14:48,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:48,068 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:48,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:48,068 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:48,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-10-13 07:14:48,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:48,397 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:14:48,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:48,439 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:48,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:14:48,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 07:14:48,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:48,860 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 07:14:48,860 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 07:14:48,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [147112274] [2021-10-13 07:14:48,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [147112274] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:48,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [862825908] [2021-10-13 07:14:48,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:48,860 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 07:14:48,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 07:14:48,861 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 07:14:48,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-10-13 07:14:49,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:49,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:14:49,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:49,400 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:49,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:14:49,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 07:14:49,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:49,674 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 07:14:49,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [862825908] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:49,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99961749] [2021-10-13 07:14:49,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:49,675 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:14:49,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 07:14:49,686 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 07:14:49,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-10-13 07:14:50,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 07:14:50,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2021-10-13 07:14:50,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 07:14:50,174 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-10-13 07:14:50,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-10-13 07:14:50,258 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 07:14:50,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 07:14:50,434 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-13 07:14:50,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99961749] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 07:14:50,434 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 07:14:50,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 9 [2021-10-13 07:14:50,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258049040] [2021-10-13 07:14:50,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-10-13 07:14:50,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 07:14:50,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-10-13 07:14:50,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-10-13 07:14:50,435 INFO L87 Difference]: Start difference. First operand 144 states and 175 transitions. Second operand has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:51,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 07:14:51,196 INFO L93 Difference]: Finished difference Result 218 states and 244 transitions. [2021-10-13 07:14:51,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 07:14:51,196 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 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 17 [2021-10-13 07:14:51,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 07:14:51,197 INFO L225 Difference]: With dead ends: 218 [2021-10-13 07:14:51,197 INFO L226 Difference]: Without dead ends: 218 [2021-10-13 07:14:51,198 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 424.3ms TimeCoverageRelationStatistics Valid=81, Invalid=191, Unknown=0, NotChecked=0, Total=272 [2021-10-13 07:14:51,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2021-10-13 07:14:51,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 161. [2021-10-13 07:14:51,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 155 states have (on average 1.2451612903225806) internal successors, (193), 160 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:51,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 193 transitions. [2021-10-13 07:14:51,203 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 193 transitions. Word has length 17 [2021-10-13 07:14:51,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 07:14:51,203 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 193 transitions. [2021-10-13 07:14:51,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.0) internal successors, (27), 10 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 07:14:51,203 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 193 transitions. [2021-10-13 07:14:51,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-13 07:14:51,204 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 07:14:51,204 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 07:14:51,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:51,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-10-13 07:14:51,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:51,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 07:14:51,807 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 17 more)] === [2021-10-13 07:14:51,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 07:14:51,808 INFO L82 PathProgramCache]: Analyzing trace with hash 925334210, now seen corresponding path program 1 times [2021-10-13 07:14:51,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 07:14:51,808 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [351274588] [2021-10-13 07:14:51,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 07:14:51,808 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 07:14:51,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 07:14:51,809 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 07:14:51,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-10-13 07:14:52,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-13 07:14:52,193 INFO L354 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-13 07:14:52,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-13 07:14:52,264 INFO L133 FreeRefinementEngine]: Strategy WALRUS found a feasible trace [2021-10-13 07:14:52,265 INFO L626 BasicCegarLoop]: Counterexample is feasible [2021-10-13 07:14:52,266 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,267 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0REQUIRES_VIOLATION [2021-10-13 07:14:52,268 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr1REQUIRES_VIOLATION [2021-10-13 07:14:52,268 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr2REQUIRES_VIOLATION [2021-10-13 07:14:52,268 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr3REQUIRES_VIOLATION [2021-10-13 07:14:52,268 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr4REQUIRES_VIOLATION [2021-10-13 07:14:52,268 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr5REQUIRES_VIOLATION [2021-10-13 07:14:52,269 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr6REQUIRES_VIOLATION [2021-10-13 07:14:52,269 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr7REQUIRES_VIOLATION [2021-10-13 07:14:52,269 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,269 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,269 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr10ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,270 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,270 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,270 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,270 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,270 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,271 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,271 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,271 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr19ASSERT_VIOLATIONMEMORY_FREE [2021-10-13 07:14:52,271 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_LEAK [2021-10-13 07:14:52,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-10-13 07:14:52,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 07:14:52,489 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 07:14:52,533 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 07:14:52 BoogieIcfgContainer [2021-10-13 07:14:52,536 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 07:14:52,537 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 07:14:52,537 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 07:14:52,537 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 07:14:52,538 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:13:23" (3/4) ... [2021-10-13 07:14:52,540 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-13 07:14:52,585 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 07:14:52,586 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 07:14:52,587 INFO L168 Benchmark]: Toolchain (without parser) took 90603.81 ms. Allocated memory was 71.3 MB in the beginning and 88.1 MB in the end (delta: 16.8 MB). Free memory was 52.0 MB in the beginning and 37.2 MB in the end (delta: 14.8 MB). Peak memory consumption was 31.2 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,587 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 71.3 MB. Free memory is still 51.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 07:14:52,587 INFO L168 Benchmark]: CACSL2BoogieTranslator took 508.38 ms. Allocated memory is still 71.3 MB. Free memory was 51.9 MB in the beginning and 47.6 MB in the end (delta: 4.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,588 INFO L168 Benchmark]: Boogie Procedure Inliner took 64.47 ms. Allocated memory is still 71.3 MB. Free memory was 47.6 MB in the beginning and 45.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,588 INFO L168 Benchmark]: Boogie Preprocessor took 74.63 ms. Allocated memory is still 71.3 MB. Free memory was 45.6 MB in the beginning and 44.0 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,594 INFO L168 Benchmark]: RCFGBuilder took 623.58 ms. Allocated memory is still 71.3 MB. Free memory was 44.0 MB in the beginning and 30.5 MB in the end (delta: 13.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,594 INFO L168 Benchmark]: TraceAbstraction took 89276.67 ms. Allocated memory was 71.3 MB in the beginning and 88.1 MB in the end (delta: 16.8 MB). Free memory was 30.1 MB in the beginning and 39.9 MB in the end (delta: -9.8 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,595 INFO L168 Benchmark]: Witness Printer took 48.98 ms. Allocated memory is still 88.1 MB. Free memory was 39.9 MB in the beginning and 37.2 MB in the end (delta: 2.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-13 07:14:52,596 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 71.3 MB. Free memory is still 51.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 508.38 ms. Allocated memory is still 71.3 MB. Free memory was 51.9 MB in the beginning and 47.6 MB in the end (delta: 4.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 64.47 ms. Allocated memory is still 71.3 MB. Free memory was 47.6 MB in the beginning and 45.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 74.63 ms. Allocated memory is still 71.3 MB. Free memory was 45.6 MB in the beginning and 44.0 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 623.58 ms. Allocated memory is still 71.3 MB. Free memory was 44.0 MB in the beginning and 30.5 MB in the end (delta: 13.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 89276.67 ms. Allocated memory was 71.3 MB in the beginning and 88.1 MB in the end (delta: 16.8 MB). Free memory was 30.1 MB in the beginning and 39.9 MB in the end (delta: -9.8 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. * Witness Printer took 48.98 ms. Allocated memory is still 88.1 MB. Free memory was 39.9 MB in the beginning and 37.2 MB in the end (delta: 2.6 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 547]: free of unallocated memory possible free of unallocated memory possible We found a FailurePath: [L523] int *a, *b; [L524] int n; VAL [a={0:0}, b={0:0}, n=0] [L536] n = 1 VAL [a={0:0}, b={0:0}, n=1] [L537] COND FALSE !(__VERIFIER_nondet_int() && n < 30) [L540] a = malloc(n * sizeof(*a)) [L541] b = malloc(n * sizeof(*b)) [L542] EXPR b++ VAL [a={3:0}, b={1:4}, n=1] [L542] *b++ = 0 VAL [a={3:0}, b={1:4}, n=1] [L528] int i; [L529] i = 0 VAL [a={3:0}, b={1:4}, n=1] [L529] COND TRUE i < n VAL [a={3:0}, b={1:4}, n=1] [L530] a[i] = -1 VAL [a={3:0}, b={1:4}, n=1] [L529] i++ VAL [a={3:0}, b={1:4}, n=1] [L529] COND FALSE !(i < n) VAL [a={3:0}, b={1:4}, n=1] [L531] i = 0 VAL [a={3:0}, b={1:4}, n=1] [L531] COND FALSE !(i < n - 1) VAL [a={3:0}, b={1:4}, n=1] [L544] b[-1] VAL [a={3:0}, b={1:4}, n=1] [L544] COND FALSE !(b[-1]) [L547] free(a) VAL [a={3:0}, b={1:4}, n=1] [L547] free(a) VAL [a={3:0}, b={1:4}, n=1] [L547] free(a) [L547] free(b) VAL [a={3:0}, b={1:4}, n=1] - UnprovableResult [Line: 542]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 542]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 530]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 530]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 532]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 532]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 544]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 544]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 545]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 547]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: Not analyzed. - UnprovableResult [Line: 534]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: Not analyzed. - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 52 locations, 21 error locations. Started 1 CEGAR loops. OverallTime: 89155.6ms, OverallIterations: 19, TraceHistogramMax: 6, EmptinessCheckTime: 24.2ms, AutomataDifference: 55042.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1046 SDtfs, 12453 SDslu, 5030 SDs, 0 SdLazy, 5427 SolverSat, 898 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 29248.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1078 GetRequests, 715 SyntacticMatches, 0 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4697 ImplicationChecksByTransitivity, 29336.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=161occurred in iteration=18, InterpolantAutomatonStates: 307, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 145.4ms AutomataMinimizationTime, 18 MinimizatonAttempts, 2660 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 292.1ms SsaConstructionTime, 1294.7ms SatisfiabilityAnalysisTime, 15564.0ms InterpolantComputationTime, 498 NumberOfCodeBlocks, 492 NumberOfCodeBlocksAsserted, 53 NumberOfCheckSat, 880 ConstructedInterpolants, 32 QuantifiedInterpolants, 7395 SizeOfPredicates, 105 NumberOfNonLiveVariables, 2214 ConjunctsInSsa, 265 ConjunctsInUnsatCore, 80 InterpolantComputations, 16 PerfectInterpolantSequences, 96/496 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2021-10-13 07:14:52,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_01fb415b-ac3f-442d-9f9a-aed8f1c58ce8/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...