./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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 b812e7d14425eea3a24125f5e2db40eadfc6c14c ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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 b812e7d14425eea3a24125f5e2db40eadfc6c14c .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-4e77c04 [2021-10-13 08:15:50,670 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 08:15:50,673 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 08:15:50,724 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 08:15:50,724 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 08:15:50,726 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 08:15:50,727 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 08:15:50,730 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 08:15:50,732 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 08:15:50,733 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 08:15:50,734 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 08:15:50,736 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 08:15:50,736 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 08:15:50,737 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 08:15:50,739 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 08:15:50,741 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 08:15:50,742 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 08:15:50,743 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 08:15:50,745 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 08:15:50,748 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 08:15:50,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 08:15:50,752 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 08:15:50,753 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 08:15:50,754 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 08:15:50,758 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 08:15:50,758 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 08:15:50,759 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 08:15:50,760 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 08:15:50,761 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 08:15:50,762 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 08:15:50,762 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 08:15:50,763 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 08:15:50,764 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 08:15:50,765 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 08:15:50,766 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 08:15:50,767 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 08:15:50,768 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 08:15:50,768 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 08:15:50,769 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 08:15:50,770 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 08:15:50,771 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 08:15:50,774 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-10-13 08:15:50,814 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 08:15:50,814 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 08:15:50,815 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 08:15:50,815 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 08:15:50,816 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 08:15:50,816 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 08:15:50,816 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-13 08:15:50,816 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 08:15:50,816 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 08:15:50,817 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-13 08:15:50,817 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-13 08:15:50,817 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 08:15:50,817 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-13 08:15:50,818 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-13 08:15:50,818 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-13 08:15:50,818 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 08:15:50,819 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 08:15:50,819 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 08:15:50,819 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 08:15:50,819 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 08:15:50,820 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 08:15:50,820 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 08:15:50,820 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 08:15:50,820 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 08:15:50,820 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 08:15:50,821 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 08:15:50,821 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 08:15:50,821 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 08:15:50,821 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 08:15:50,822 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 08:15:50,822 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 08:15:50,822 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 08:15:50,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:15:50,823 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 08:15:50,823 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 08:15:50,823 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-13 08:15:50,823 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-13 08:15:50,823 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 08:15:50,824 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 08:15:50,824 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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b812e7d14425eea3a24125f5e2db40eadfc6c14c [2021-10-13 08:15:51,103 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 08:15:51,141 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 08:15:51,143 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 08:15:51,144 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 08:15:51,145 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 08:15:51,146 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2021-10-13 08:15:51,241 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/ed8f39373/83261b790c3e4b94a9ae7f5566827bf2/FLAG66a2e5d0c [2021-10-13 08:15:51,761 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 08:15:51,767 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2021-10-13 08:15:51,793 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/ed8f39373/83261b790c3e4b94a9ae7f5566827bf2/FLAG66a2e5d0c [2021-10-13 08:15:52,056 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/ed8f39373/83261b790c3e4b94a9ae7f5566827bf2 [2021-10-13 08:15:52,061 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 08:15:52,063 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 08:15:52,068 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 08:15:52,068 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 08:15:52,072 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 08:15:52,073 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,075 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ec2cb3c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52, skipping insertion in model container [2021-10-13 08:15:52,075 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,084 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 08:15:52,140 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 08:15:52,460 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:15:52,469 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 08:15:52,532 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:15:52,567 INFO L208 MainTranslator]: Completed translation [2021-10-13 08:15:52,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52 WrapperNode [2021-10-13 08:15:52,568 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 08:15:52,569 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 08:15:52,570 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 08:15:52,570 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 08:15:52,578 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,593 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,617 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 08:15:52,618 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 08:15:52,618 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 08:15:52,618 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 08:15:52,627 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,628 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,649 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,650 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,659 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,663 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,665 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,667 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 08:15:52,668 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 08:15:52,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 08:15:52,668 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 08:15:52,681 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (1/1) ... [2021-10-13 08:15:52,689 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:15:52,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:15:52,719 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 08:15:52,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 08:15:52,759 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-13 08:15:52,760 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-13 08:15:52,760 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 08:15:52,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 08:15:52,760 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 08:15:52,761 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 08:15:53,152 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 08:15:53,153 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-13 08:15:53,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:15:53 BoogieIcfgContainer [2021-10-13 08:15:53,155 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 08:15:53,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 08:15:53,157 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 08:15:53,162 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 08:15:53,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:15:52" (1/3) ... [2021-10-13 08:15:53,163 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1427f1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:15:53, skipping insertion in model container [2021-10-13 08:15:53,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:52" (2/3) ... [2021-10-13 08:15:53,164 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1427f1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:15:53, skipping insertion in model container [2021-10-13 08:15:53,164 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:15:53" (3/3) ... [2021-10-13 08:15:53,166 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrlen-alloca-1.i [2021-10-13 08:15:53,179 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 08:15:53,179 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-10-13 08:15:53,220 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 08:15:53,227 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 08:15:53,227 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-10-13 08:15:53,242 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 8 states have (on average 2.25) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 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 08:15:53,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-10-13 08:15:53,248 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:15:53,249 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-10-13 08:15:53,249 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:15:53,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:15:53,256 INFO L82 PathProgramCache]: Analyzing trace with hash 92346, now seen corresponding path program 1 times [2021-10-13 08:15:53,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:15:53,266 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382025985] [2021-10-13 08:15:53,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:53,267 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:15:53,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:53,480 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 08:15:53,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:15:53,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382025985] [2021-10-13 08:15:53,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [382025985] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:15:53,482 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:15:53,483 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-10-13 08:15:53,484 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214646987] [2021-10-13 08:15:53,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 08:15:53,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:15:53,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 08:15:53,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:15:53,518 INFO L87 Difference]: Start difference. First operand has 16 states, 8 states have (on average 2.25) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 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 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 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 08:15:53,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:15:53,585 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2021-10-13 08:15:53,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 08:15:53,587 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2021-10-13 08:15:53,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:15:53,594 INFO L225 Difference]: With dead ends: 14 [2021-10-13 08:15:53,594 INFO L226 Difference]: Without dead ends: 13 [2021-10-13 08:15:53,595 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:15:53,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-10-13 08:15:53,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-10-13 08:15:53,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.75) internal successors, (14), 12 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 08:15:53,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-10-13 08:15:53,626 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 3 [2021-10-13 08:15:53,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:15:53,626 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-10-13 08:15:53,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 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 08:15:53,627 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-10-13 08:15:53,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-10-13 08:15:53,627 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:15:53,627 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-10-13 08:15:53,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-13 08:15:53,628 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:15:53,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:15:53,632 INFO L82 PathProgramCache]: Analyzing trace with hash 92347, now seen corresponding path program 1 times [2021-10-13 08:15:53,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:15:53,632 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304822904] [2021-10-13 08:15:53,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:53,633 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:15:53,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:53,759 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 08:15:53,759 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:15:53,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304822904] [2021-10-13 08:15:53,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304822904] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:15:53,760 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:15:53,761 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-10-13 08:15:53,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229490285] [2021-10-13 08:15:53,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 08:15:53,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:15:53,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 08:15:53,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:15:53,764 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 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 08:15:53,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:15:53,787 INFO L93 Difference]: Finished difference Result 12 states and 13 transitions. [2021-10-13 08:15:53,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 08:15:53,788 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2021-10-13 08:15:53,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:15:53,789 INFO L225 Difference]: With dead ends: 12 [2021-10-13 08:15:53,789 INFO L226 Difference]: Without dead ends: 12 [2021-10-13 08:15:53,790 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:15:53,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-10-13 08:15:53,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-10-13 08:15:53,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.625) internal successors, (13), 11 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 08:15:53,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-10-13 08:15:53,796 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 3 [2021-10-13 08:15:53,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:15:53,796 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-10-13 08:15:53,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 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 08:15:53,797 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-10-13 08:15:53,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-10-13 08:15:53,797 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:15:53,797 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-10-13 08:15:53,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-13 08:15:53,798 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:15:53,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:15:53,800 INFO L82 PathProgramCache]: Analyzing trace with hash 90881, now seen corresponding path program 1 times [2021-10-13 08:15:53,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:15:53,804 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202584854] [2021-10-13 08:15:53,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:53,804 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:15:53,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:53,923 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 08:15:53,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:15:53,924 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202584854] [2021-10-13 08:15:53,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202584854] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:15:53,926 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:15:53,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 08:15:53,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116815292] [2021-10-13 08:15:53,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 08:15:53,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:15:53,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 08:15:53,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 08:15:53,937 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 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 08:15:54,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:15:54,011 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-10-13 08:15:54,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 08:15:54,012 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 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 3 [2021-10-13 08:15:54,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:15:54,013 INFO L225 Difference]: With dead ends: 22 [2021-10-13 08:15:54,013 INFO L226 Difference]: Without dead ends: 22 [2021-10-13 08:15:54,014 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:15:54,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-10-13 08:15:54,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2021-10-13 08:15:54,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.6) internal successors, (16), 13 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 08:15:54,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-10-13 08:15:54,018 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 3 [2021-10-13 08:15:54,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:15:54,018 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-10-13 08:15:54,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 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 08:15:54,019 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-10-13 08:15:54,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-13 08:15:54,019 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:15:54,019 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-13 08:15:54,020 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-13 08:15:54,020 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:15:54,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:15:54,021 INFO L82 PathProgramCache]: Analyzing trace with hash 2863691, now seen corresponding path program 1 times [2021-10-13 08:15:54,021 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:15:54,021 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432468807] [2021-10-13 08:15:54,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:54,022 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:15:54,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:54,069 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 08:15:54,069 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:15:54,069 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432468807] [2021-10-13 08:15:54,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432468807] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:15:54,070 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:15:54,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 08:15:54,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785421802] [2021-10-13 08:15:54,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 08:15:54,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:15:54,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 08:15:54,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:15:54,072 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 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 08:15:54,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:15:54,095 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2021-10-13 08:15:54,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 08:15:54,096 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 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 08:15:54,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:15:54,096 INFO L225 Difference]: With dead ends: 13 [2021-10-13 08:15:54,096 INFO L226 Difference]: Without dead ends: 13 [2021-10-13 08:15:54,097 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:15:54,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-10-13 08:15:54,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-10-13 08:15:54,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 10 states have (on average 1.5) internal successors, (15), 12 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 08:15:54,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-10-13 08:15:54,099 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 4 [2021-10-13 08:15:54,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:15:54,100 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-10-13 08:15:54,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 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 08:15:54,100 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-10-13 08:15:54,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-10-13 08:15:54,101 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:15:54,101 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-10-13 08:15:54,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-10-13 08:15:54,101 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:15:54,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:15:54,102 INFO L82 PathProgramCache]: Analyzing trace with hash 2863692, now seen corresponding path program 1 times [2021-10-13 08:15:54,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:15:54,103 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518884200] [2021-10-13 08:15:54,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:54,103 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:15:54,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:54,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:15:54,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:15:54,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518884200] [2021-10-13 08:15:54,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518884200] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-13 08:15:54,167 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:15:54,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-13 08:15:54,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184393718] [2021-10-13 08:15:54,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 08:15:54,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-13 08:15:54,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 08:15:54,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 08:15:54,169 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 08:15:54,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:15:54,230 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-10-13 08:15:54,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 08:15:54,231 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 08:15:54,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:15:54,233 INFO L225 Difference]: With dead ends: 18 [2021-10-13 08:15:54,234 INFO L226 Difference]: Without dead ends: 18 [2021-10-13 08:15:54,234 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:15:54,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-10-13 08:15:54,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 14. [2021-10-13 08:15:54,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 13 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 08:15:54,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-10-13 08:15:54,240 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 4 [2021-10-13 08:15:54,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:15:54,240 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-10-13 08:15:54,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 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 08:15:54,241 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-10-13 08:15:54,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-10-13 08:15:54,242 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:15:54,242 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-10-13 08:15:54,243 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-10-13 08:15:54,243 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:15:54,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:15:54,243 INFO L82 PathProgramCache]: Analyzing trace with hash 87371784, now seen corresponding path program 1 times [2021-10-13 08:15:54,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-13 08:15:54,244 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375892325] [2021-10-13 08:15:54,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:54,244 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-13 08:15:54,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:54,385 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 08:15:54,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-13 08:15:54,385 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375892325] [2021-10-13 08:15:54,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375892325] provided 0 perfect and 1 imperfect interpolant sequences [2021-10-13 08:15:54,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175160177] [2021-10-13 08:15:54,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:15:54,386 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:15:54,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:15:54,392 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:15:54,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-13 08:15:54,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:15:54,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2021-10-13 08:15:54,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:15:54,532 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:15:54,613 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 08:15:54,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:15:54,798 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 08:15:54,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175160177] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:15:54,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696621386] [2021-10-13 08:15:54,826 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-10-13 08:15:54,827 INFO L166 IcfgInterpreter]: Building call graph [2021-10-13 08:15:54,831 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-10-13 08:15:54,837 INFO L176 IcfgInterpreter]: Starting interpretation [2021-10-13 08:15:54,838 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-10-13 08:15:54,873 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,893 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 08:15:54,894 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 11 [2021-10-13 08:15:54,900 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 08:15:54,901 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 6 [2021-10-13 08:15:54,904 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-10-13 08:15:54,905 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,906 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 24 [2021-10-13 08:15:54,908 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 72 [2021-10-13 08:15:54,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 08:15:54,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 24 [2021-10-13 08:15:54,965 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,968 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-10-13 08:15:54,968 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,969 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-10-13 08:15:54,970 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-10-13 08:15:54,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-10-13 08:15:54,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 24 [2021-10-13 08:15:54,985 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,987 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-10-13 08:15:54,988 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:54,989 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-10-13 08:15:54,990 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-10-13 08:15:54,992 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-13 08:15:55,029 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:55,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:15:55,033 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-10-13 08:15:55,034 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-10-13 08:15:55,034 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:126, output treesize:120 [2021-10-13 08:15:55,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-10-13 08:15:55,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-10-13 08:15:55,261 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: No corresponding IProgramVar for |v_#length_20| 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 08:15:55,265 INFO L168 Benchmark]: Toolchain (without parser) took 3201.37 ms. Allocated memory was 92.3 MB in the beginning and 132.1 MB in the end (delta: 39.8 MB). Free memory was 55.8 MB in the beginning and 67.1 MB in the end (delta: -11.2 MB). Peak memory consumption was 29.6 MB. Max. memory is 16.1 GB. [2021-10-13 08:15:55,266 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 92.3 MB. Free memory was 64.6 MB in the beginning and 64.5 MB in the end (delta: 29.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:15:55,266 INFO L168 Benchmark]: CACSL2BoogieTranslator took 501.02 ms. Allocated memory was 92.3 MB in the beginning and 132.1 MB in the end (delta: 39.8 MB). Free memory was 55.6 MB in the beginning and 101.8 MB in the end (delta: -46.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-10-13 08:15:55,267 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.87 ms. Allocated memory is still 132.1 MB. Free memory was 101.8 MB in the beginning and 99.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 08:15:55,267 INFO L168 Benchmark]: Boogie Preprocessor took 49.36 ms. Allocated memory is still 132.1 MB. Free memory was 99.7 MB in the beginning and 98.9 MB in the end (delta: 723.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:15:55,268 INFO L168 Benchmark]: RCFGBuilder took 487.50 ms. Allocated memory is still 132.1 MB. Free memory was 98.3 MB in the beginning and 85.0 MB in the end (delta: 13.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-13 08:15:55,268 INFO L168 Benchmark]: TraceAbstraction took 2106.73 ms. Allocated memory is still 132.1 MB. Free memory was 85.0 MB in the beginning and 67.1 MB in the end (delta: 17.9 MB). Peak memory consumption was 19.6 MB. Max. memory is 16.1 GB. [2021-10-13 08:15:55,278 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 92.3 MB. Free memory was 64.6 MB in the beginning and 64.5 MB in the end (delta: 29.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 501.02 ms. Allocated memory was 92.3 MB in the beginning and 132.1 MB in the end (delta: 39.8 MB). Free memory was 55.6 MB in the beginning and 101.8 MB in the end (delta: -46.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 47.87 ms. Allocated memory is still 132.1 MB. Free memory was 101.8 MB in the beginning and 99.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 49.36 ms. Allocated memory is still 132.1 MB. Free memory was 99.7 MB in the beginning and 98.9 MB in the end (delta: 723.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 487.50 ms. Allocated memory is still 132.1 MB. Free memory was 98.3 MB in the beginning and 85.0 MB in the end (delta: 13.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2106.73 ms. Allocated memory is still 132.1 MB. Free memory was 85.0 MB in the beginning and 67.1 MB in the end (delta: 17.9 MB). Peak memory consumption was 19.6 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: No corresponding IProgramVar for |v_#length_20| de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: No corresponding IProgramVar for |v_#length_20|: 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 08:15:55,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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 08:15:57,799 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-13 08:15:57,802 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-13 08:15:57,838 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-13 08:15:57,839 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-13 08:15:57,841 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-13 08:15:57,843 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-13 08:15:57,846 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-13 08:15:57,853 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-13 08:15:57,855 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-13 08:15:57,856 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-13 08:15:57,858 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-13 08:15:57,859 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-13 08:15:57,861 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-13 08:15:57,863 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-13 08:15:57,865 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-13 08:15:57,867 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-13 08:15:57,869 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-13 08:15:57,872 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-13 08:15:57,875 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-13 08:15:57,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-13 08:15:57,880 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-13 08:15:57,882 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-13 08:15:57,884 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-13 08:15:57,889 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-13 08:15:57,890 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-13 08:15:57,890 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-13 08:15:57,892 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-13 08:15:57,892 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-13 08:15:57,894 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-13 08:15:57,895 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-13 08:15:57,896 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-13 08:15:57,897 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-13 08:15:57,898 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-13 08:15:57,900 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-13 08:15:57,901 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-13 08:15:57,902 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-13 08:15:57,902 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-13 08:15:57,903 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-13 08:15:57,904 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-13 08:15:57,905 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-13 08:15:57,907 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Bitvector.epf [2021-10-13 08:15:57,947 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-13 08:15:57,947 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-13 08:15:57,948 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-13 08:15:57,949 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-13 08:15:57,949 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-13 08:15:57,950 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-13 08:15:57,950 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-13 08:15:57,950 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-13 08:15:57,951 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-13 08:15:57,952 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-13 08:15:57,959 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-13 08:15:57,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-13 08:15:57,962 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-13 08:15:57,962 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-10-13 08:15:57,962 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-13 08:15:57,962 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-13 08:15:57,963 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-13 08:15:57,963 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-10-13 08:15:57,963 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-10-13 08:15:57,963 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-10-13 08:15:57,963 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-13 08:15:57,964 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-13 08:15:57,964 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-10-13 08:15:57,965 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-10-13 08:15:57,965 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-13 08:15:57,965 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-13 08:15:57,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-13 08:15:57,965 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-13 08:15:57,966 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-13 08:15:57,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:15:57,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-13 08:15:57,966 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-13 08:15:57,967 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-10-13 08:15:57,967 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-10-13 08:15:57,967 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-13 08:15:57,967 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-13 08:15:57,968 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_bbae2592-35a6-434e-a5cc-9c64b9d441c6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b812e7d14425eea3a24125f5e2db40eadfc6c14c [2021-10-13 08:15:58,430 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-13 08:15:58,461 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-13 08:15:58,464 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-13 08:15:58,466 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-13 08:15:58,466 INFO L275 PluginConnector]: CDTParser initialized [2021-10-13 08:15:58,467 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/../../sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2021-10-13 08:15:58,557 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/c17705216/6cb1b7fd3f314245b11596d3ed203354/FLAG462656be6 [2021-10-13 08:15:59,210 INFO L306 CDTParser]: Found 1 translation units. [2021-10-13 08:15:59,210 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/sv-benchmarks/c/array-memsafety/openbsd_cstrlen-alloca-1.i [2021-10-13 08:15:59,224 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/c17705216/6cb1b7fd3f314245b11596d3ed203354/FLAG462656be6 [2021-10-13 08:15:59,449 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/data/c17705216/6cb1b7fd3f314245b11596d3ed203354 [2021-10-13 08:15:59,452 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-13 08:15:59,453 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-13 08:15:59,454 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-13 08:15:59,454 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-13 08:15:59,458 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-13 08:15:59,459 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:15:59,461 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@180527b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59, skipping insertion in model container [2021-10-13 08:15:59,462 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:15:59,470 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-13 08:15:59,528 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-13 08:15:59,833 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:15:59,846 INFO L203 MainTranslator]: Completed pre-run [2021-10-13 08:15:59,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-13 08:15:59,916 INFO L208 MainTranslator]: Completed translation [2021-10-13 08:15:59,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59 WrapperNode [2021-10-13 08:15:59,917 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-13 08:15:59,918 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-13 08:15:59,918 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-13 08:15:59,918 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-13 08:15:59,926 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:15:59,959 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:15:59,983 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-13 08:15:59,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-13 08:15:59,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-13 08:15:59,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-13 08:15:59,992 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:15:59,993 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,006 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,007 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,024 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,031 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,033 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-13 08:16:00,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-13 08:16:00,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-13 08:16:00,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-13 08:16:00,035 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (1/1) ... [2021-10-13 08:16:00,048 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-13 08:16:00,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:16:00,072 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-13 08:16:00,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-13 08:16:00,147 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-10-13 08:16:00,147 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-13 08:16:00,147 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-10-13 08:16:00,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-10-13 08:16:00,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-13 08:16:00,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-13 08:16:00,440 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-13 08:16:00,440 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-13 08:16:00,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:16:00 BoogieIcfgContainer [2021-10-13 08:16:00,442 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-13 08:16:00,444 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-13 08:16:00,444 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-13 08:16:00,447 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-13 08:16:00,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:15:59" (1/3) ... [2021-10-13 08:16:00,448 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@edf6d6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:16:00, skipping insertion in model container [2021-10-13 08:16:00,448 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:15:59" (2/3) ... [2021-10-13 08:16:00,449 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@edf6d6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:16:00, skipping insertion in model container [2021-10-13 08:16:00,449 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:16:00" (3/3) ... [2021-10-13 08:16:00,450 INFO L111 eAbstractionObserver]: Analyzing ICFG openbsd_cstrlen-alloca-1.i [2021-10-13 08:16:00,455 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-13 08:16:00,456 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 7 error locations. [2021-10-13 08:16:00,530 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-13 08:16:00,542 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 08:16:00,542 INFO L340 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-10-13 08:16:00,565 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 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 08:16:00,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 08:16:00,579 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:00,580 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 08:16:00,580 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:00,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:00,586 INFO L82 PathProgramCache]: Analyzing trace with hash 889508873, now seen corresponding path program 1 times [2021-10-13 08:16:00,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:00,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1452259903] [2021-10-13 08:16:00,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:00,606 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:00,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:00,613 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:00,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-10-13 08:16:00,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:00,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 08:16:00,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:00,837 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 08:16:00,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:00,888 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 08:16:00,889 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:00,889 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1452259903] [2021-10-13 08:16:00,890 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1452259903] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:00,890 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:00,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-10-13 08:16:00,892 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774593414] [2021-10-13 08:16:00,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 08:16:00,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:00,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 08:16:00,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 08:16:00,913 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 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 6 states, 6 states have (on average 1.5) 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 08:16:01,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:01,038 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-10-13 08:16:01,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:16:01,043 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) 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 6 [2021-10-13 08:16:01,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:01,052 INFO L225 Difference]: With dead ends: 42 [2021-10-13 08:16:01,052 INFO L226 Difference]: Without dead ends: 38 [2021-10-13 08:16:01,054 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 35.7ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 08:16:01,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-10-13 08:16:01,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 25. [2021-10-13 08:16:01,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.5) internal successors, (27), 24 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 08:16:01,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-10-13 08:16:01,090 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 6 [2021-10-13 08:16:01,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:01,091 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-10-13 08:16:01,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) 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 08:16:01,092 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-10-13 08:16:01,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 08:16:01,093 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:01,093 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 08:16:01,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:01,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:01,305 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:01,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:01,311 INFO L82 PathProgramCache]: Analyzing trace with hash 889508820, now seen corresponding path program 1 times [2021-10-13 08:16:01,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:01,313 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2132052922] [2021-10-13 08:16:01,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:01,314 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:01,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:01,315 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:01,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-10-13 08:16:01,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:01,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 3 conjunts are in the unsatisfiable core [2021-10-13 08:16:01,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:01,447 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:01,467 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 08:16:01,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:01,490 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 08:16:01,490 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:01,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2132052922] [2021-10-13 08:16:01,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2132052922] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:01,491 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:01,491 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-10-13 08:16:01,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574508822] [2021-10-13 08:16:01,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-10-13 08:16:01,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:01,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-10-13 08:16:01,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:16:01,494 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 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 08:16:01,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:01,560 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-10-13 08:16:01,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-10-13 08:16:01,561 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-10-13 08:16:01,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:01,561 INFO L225 Difference]: With dead ends: 23 [2021-10-13 08:16:01,562 INFO L226 Difference]: Without dead ends: 23 [2021-10-13 08:16:01,562 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-10-13 08:16:01,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-10-13 08:16:01,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-10-13 08:16:01,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 22 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 08:16:01,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-10-13 08:16:01,566 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 6 [2021-10-13 08:16:01,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:01,566 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-10-13 08:16:01,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 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 08:16:01,567 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-10-13 08:16:01,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 08:16:01,567 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:01,568 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 08:16:01,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:01,780 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:01,780 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:01,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:01,781 INFO L82 PathProgramCache]: Analyzing trace with hash 889508821, now seen corresponding path program 1 times [2021-10-13 08:16:01,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:01,782 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [706145980] [2021-10-13 08:16:01,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:01,782 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:01,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:01,785 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:01,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-10-13 08:16:01,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:01,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:16:01,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:01,917 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:01,980 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 08:16:01,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:02,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:02,166 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:02,166 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [706145980] [2021-10-13 08:16:02,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [706145980] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:02,167 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:02,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 08:16:02,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858041147] [2021-10-13 08:16:02,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 08:16:02,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:02,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 08:16:02,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-13 08:16:02,169 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 08:16:02,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:02,380 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-10-13 08:16:02,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-13 08:16:02,382 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 6 [2021-10-13 08:16:02,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:02,383 INFO L225 Difference]: With dead ends: 33 [2021-10-13 08:16:02,383 INFO L226 Difference]: Without dead ends: 33 [2021-10-13 08:16:02,383 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 148.3ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-10-13 08:16:02,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-10-13 08:16:02,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 22. [2021-10-13 08:16:02,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 21 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 08:16:02,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-10-13 08:16:02,387 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 6 [2021-10-13 08:16:02,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:02,387 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-10-13 08:16:02,387 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 08:16:02,388 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-10-13 08:16:02,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-13 08:16:02,388 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:02,388 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-13 08:16:02,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:02,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:02,599 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:02,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:02,600 INFO L82 PathProgramCache]: Analyzing trace with hash 889568456, now seen corresponding path program 1 times [2021-10-13 08:16:02,600 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:02,601 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1502807223] [2021-10-13 08:16:02,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:02,601 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:02,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:02,602 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:02,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-10-13 08:16:02,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:02,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-13 08:16:02,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:02,707 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 0 case distinctions, treesize of input 11 treesize of output 10 [2021-10-13 08:16:02,745 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 08:16:02,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:02,932 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 08:16:02,932 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:02,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1502807223] [2021-10-13 08:16:02,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1502807223] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:02,933 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:02,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2021-10-13 08:16:02,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082148140] [2021-10-13 08:16:02,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-13 08:16:02,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:02,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-13 08:16:02,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-10-13 08:16:02,935 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 08:16:03,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:03,188 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2021-10-13 08:16:03,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:16:03,189 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 6 [2021-10-13 08:16:03,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:03,190 INFO L225 Difference]: With dead ends: 37 [2021-10-13 08:16:03,190 INFO L226 Difference]: Without dead ends: 37 [2021-10-13 08:16:03,191 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 186.8ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-10-13 08:16:03,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-10-13 08:16:03,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 24. [2021-10-13 08:16:03,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.35) internal successors, (27), 23 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 08:16:03,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-10-13 08:16:03,195 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 6 [2021-10-13 08:16:03,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:03,195 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-10-13 08:16:03,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 6 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 08:16:03,196 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-10-13 08:16:03,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 08:16:03,196 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:03,197 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:03,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (5)] Ended with exit code 0 [2021-10-13 08:16:03,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:03,406 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:03,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:03,407 INFO L82 PathProgramCache]: Analyzing trace with hash 119484120, now seen corresponding path program 1 times [2021-10-13 08:16:03,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:03,408 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1138631039] [2021-10-13 08:16:03,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:03,409 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:03,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:03,410 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:03,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-10-13 08:16:03,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:03,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:16:03,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:03,492 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:03,520 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 08:16:03,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:03,550 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 08:16:03,550 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:03,550 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1138631039] [2021-10-13 08:16:03,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1138631039] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:03,550 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:03,551 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-10-13 08:16:03,551 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964151299] [2021-10-13 08:16:03,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-13 08:16:03,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:03,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-13 08:16:03,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-13 08:16:03,553 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 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 08:16:03,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:03,620 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-10-13 08:16:03,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-13 08:16:03,621 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 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 08:16:03,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:03,621 INFO L225 Difference]: With dead ends: 23 [2021-10-13 08:16:03,621 INFO L226 Difference]: Without dead ends: 23 [2021-10-13 08:16:03,622 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-10-13 08:16:03,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-10-13 08:16:03,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-10-13 08:16:03,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 20 states have (on average 1.3) internal successors, (26), 22 states have internal predecessors, (26), 0 states have call successors, (0), 0 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 08:16:03,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2021-10-13 08:16:03,625 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 8 [2021-10-13 08:16:03,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:03,625 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2021-10-13 08:16:03,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 4 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 08:16:03,625 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2021-10-13 08:16:03,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-13 08:16:03,626 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:03,626 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:03,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:03,835 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:03,835 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:03,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:03,835 INFO L82 PathProgramCache]: Analyzing trace with hash 119484121, now seen corresponding path program 1 times [2021-10-13 08:16:03,836 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:03,836 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [849228196] [2021-10-13 08:16:03,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:03,837 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:03,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:03,838 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:03,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-10-13 08:16:03,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:03,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:16:03,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:03,988 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:04,083 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 08:16:04,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:04,278 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 08:16:04,279 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:04,279 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [849228196] [2021-10-13 08:16:04,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [849228196] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:04,279 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:04,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2021-10-13 08:16:04,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564020840] [2021-10-13 08:16:04,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 08:16:04,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:04,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 08:16:04,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-10-13 08:16:04,281 INFO L87 Difference]: Start difference. First operand 23 states and 26 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 08:16:04,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:04,708 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-10-13 08:16:04,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-13 08:16:04,710 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 8 [2021-10-13 08:16:04,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:04,710 INFO L225 Difference]: With dead ends: 41 [2021-10-13 08:16:04,710 INFO L226 Difference]: Without dead ends: 41 [2021-10-13 08:16:04,711 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 343.1ms TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2021-10-13 08:16:04,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-10-13 08:16:04,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 24. [2021-10-13 08:16:04,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 23 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 08:16:04,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-10-13 08:16:04,715 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 8 [2021-10-13 08:16:04,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:04,715 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-10-13 08:16:04,716 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 08:16:04,716 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-10-13 08:16:04,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-10-13 08:16:04,716 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:04,716 INFO L512 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:04,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:04,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:04,926 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:04,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:04,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1900556789, now seen corresponding path program 1 times [2021-10-13 08:16:04,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:04,927 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1292747103] [2021-10-13 08:16:04,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:04,927 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:04,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:04,929 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:04,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-10-13 08:16:05,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:05,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 08:16:05,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:05,059 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:05,302 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 08:16:05,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:05,986 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 08:16:05,987 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:05,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1292747103] [2021-10-13 08:16:05,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1292747103] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:05,987 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [768218571] [2021-10-13 08:16:05,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:05,988 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:16:05,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:16:06,000 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:16:06,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-10-13 08:16:06,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:06,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2021-10-13 08:16:06,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:06,163 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:06,319 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 08:16:06,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:06,563 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 08:16:06,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [768218571] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:06,564 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237352983] [2021-10-13 08:16:06,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:06,564 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:16:06,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:16:06,577 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:16:06,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-10-13 08:16:06,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:06,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:16:06,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:06,741 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:06,938 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 08:16:06,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:07,892 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 08:16:07,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237352983] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:07,893 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:16:07,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5, 4, 5, 5] total 13 [2021-10-13 08:16:07,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015016755] [2021-10-13 08:16:07,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-10-13 08:16:07,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:07,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-10-13 08:16:07,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-10-13 08:16:07,895 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 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 08:16:09,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:09,626 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2021-10-13 08:16:09,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-10-13 08:16:09,628 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 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 08:16:09,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:09,629 INFO L225 Difference]: With dead ends: 80 [2021-10-13 08:16:09,629 INFO L226 Difference]: Without dead ends: 80 [2021-10-13 08:16:09,630 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 2363.6ms TimeCoverageRelationStatistics Valid=151, Invalid=311, Unknown=0, NotChecked=0, Total=462 [2021-10-13 08:16:09,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-13 08:16:09,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 36. [2021-10-13 08:16:09,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 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 08:16:09,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-10-13 08:16:09,635 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 10 [2021-10-13 08:16:09,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:09,636 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-10-13 08:16:09,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 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 08:16:09,636 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-10-13 08:16:09,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 08:16:09,637 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:09,637 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:09,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:09,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2021-10-13 08:16:10,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (8)] Ended with exit code 0 [2021-10-13 08:16:10,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:10,257 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:10,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:10,257 INFO L82 PathProgramCache]: Analyzing trace with hash -976458485, now seen corresponding path program 1 times [2021-10-13 08:16:10,257 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:10,258 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [722401103] [2021-10-13 08:16:10,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:10,258 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:10,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:10,259 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:10,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-10-13 08:16:10,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:10,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:16:10,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:10,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 12 treesize of output 8 [2021-10-13 08:16:10,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 9 [2021-10-13 08:16:10,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:10,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:10,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 15 [2021-10-13 08:16:10,545 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 08:16:10,566 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:10,566 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:10,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [722401103] [2021-10-13 08:16:10,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [722401103] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:10,567 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:10,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 6] imperfect sequences [] total 9 [2021-10-13 08:16:10,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98056028] [2021-10-13 08:16:10,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-10-13 08:16:10,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:10,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-13 08:16:10,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-10-13 08:16:10,569 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 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 08:16:10,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:10,717 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-10-13 08:16:10,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 08:16:10,718 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 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 11 [2021-10-13 08:16:10,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:10,720 INFO L225 Difference]: With dead ends: 44 [2021-10-13 08:16:10,720 INFO L226 Difference]: Without dead ends: 44 [2021-10-13 08:16:10,720 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 125.0ms TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2021-10-13 08:16:10,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-13 08:16:10,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 40. [2021-10-13 08:16:10,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 39 states have internal predecessors, (46), 0 states have call successors, (0), 0 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 08:16:10,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-10-13 08:16:10,725 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 11 [2021-10-13 08:16:10,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:10,726 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-10-13 08:16:10,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 9 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 08:16:10,726 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-10-13 08:16:10,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-13 08:16:10,727 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:10,727 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:10,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:10,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:10,933 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:10,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:10,933 INFO L82 PathProgramCache]: Analyzing trace with hash -296400115, now seen corresponding path program 1 times [2021-10-13 08:16:10,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:10,933 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1500904565] [2021-10-13 08:16:10,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:10,933 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:10,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:10,934 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:10,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-10-13 08:16:11,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:11,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 17 conjunts are in the unsatisfiable core [2021-10-13 08:16:11,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:11,078 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:11,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 17 treesize of output 13 [2021-10-13 08:16:11,282 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:16:11,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-10-13 08:16:11,639 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 08:16:11,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:12,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 13 [2021-10-13 08:16:12,237 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 27 treesize of output 25 [2021-10-13 08:16:12,477 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 08:16:12,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:12,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1500904565] [2021-10-13 08:16:12,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1500904565] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:12,478 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2133070845] [2021-10-13 08:16:12,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:12,478 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:16:12,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:16:12,485 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:16:12,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-10-13 08:16:12,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:12,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 18 conjunts are in the unsatisfiable core [2021-10-13 08:16:12,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:12,731 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:12,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 17 treesize of output 13 [2021-10-13 08:16:12,846 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:16:12,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-10-13 08:16:12,953 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 08:16:12,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:13,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 13 [2021-10-13 08:16:13,117 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 27 treesize of output 25 [2021-10-13 08:16:13,490 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 08:16:13,490 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2133070845] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:13,490 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731807636] [2021-10-13 08:16:13,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:13,491 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:16:13,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:16:13,502 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:16:13,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-10-13 08:16:13,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:13,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-13 08:16:13,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:13,699 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:13,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 17 treesize of output 13 [2021-10-13 08:16:13,819 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:16:13,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-10-13 08:16:13,925 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 08:16:13,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:14,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 13 [2021-10-13 08:16:14,085 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 27 treesize of output 25 [2021-10-13 08:16:14,438 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 08:16:14,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731807636] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:14,438 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:16:14,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 7, 8, 7] total 17 [2021-10-13 08:16:14,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707178429] [2021-10-13 08:16:14,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-10-13 08:16:14,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:14,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-10-13 08:16:14,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-10-13 08:16:14,440 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 18 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 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 08:16:15,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:15,948 INFO L93 Difference]: Finished difference Result 54 states and 60 transitions. [2021-10-13 08:16:15,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-10-13 08:16:15,949 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 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 11 [2021-10-13 08:16:15,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:15,950 INFO L225 Difference]: With dead ends: 54 [2021-10-13 08:16:15,950 INFO L226 Difference]: Without dead ends: 54 [2021-10-13 08:16:15,951 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 40 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 2422.0ms TimeCoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2021-10-13 08:16:15,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-10-13 08:16:15,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2021-10-13 08:16:15,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 43 states have (on average 1.255813953488372) internal successors, (54), 45 states have internal predecessors, (54), 0 states have call successors, (0), 0 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 08:16:15,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2021-10-13 08:16:15,956 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 11 [2021-10-13 08:16:15,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:15,956 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2021-10-13 08:16:15,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.588235294117647) internal successors, (27), 18 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 08:16:15,957 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2021-10-13 08:16:15,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-10-13 08:16:15,958 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:15,958 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:15,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:16,179 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-10-13 08:16:16,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:16,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:16:16,559 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:16,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:16,559 INFO L82 PathProgramCache]: Analyzing trace with hash -205497247, now seen corresponding path program 1 times [2021-10-13 08:16:16,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:16,560 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2101127580] [2021-10-13 08:16:16,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:16:16,560 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:16,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:16,561 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:16,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-10-13 08:16:16,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:16:16,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2021-10-13 08:16:16,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:16,715 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:16,874 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 08:16:16,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:18,986 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 08:16:18,986 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:18,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2101127580] [2021-10-13 08:16:18,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2101127580] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-13 08:16:18,987 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-13 08:16:18,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [] total 7 [2021-10-13 08:16:18,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540313716] [2021-10-13 08:16:18,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-10-13 08:16:18,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:18,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-13 08:16:18,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=37, Unknown=1, NotChecked=0, Total=56 [2021-10-13 08:16:18,989 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 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 08:16:19,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:19,062 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2021-10-13 08:16:19,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-10-13 08:16:19,063 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 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 12 [2021-10-13 08:16:19,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:19,063 INFO L225 Difference]: With dead ends: 45 [2021-10-13 08:16:19,064 INFO L226 Difference]: Without dead ends: 36 [2021-10-13 08:16:19,064 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 2093.3ms TimeCoverageRelationStatistics Valid=23, Invalid=48, Unknown=1, NotChecked=0, Total=72 [2021-10-13 08:16:19,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-10-13 08:16:19,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-10-13 08:16:19,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 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 08:16:19,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-10-13 08:16:19,067 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 12 [2021-10-13 08:16:19,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:19,067 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-10-13 08:16:19,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 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 08:16:19,067 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-10-13 08:16:19,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-10-13 08:16:19,068 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:19,068 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:16:19,084 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:19,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:16:19,277 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:19,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:19,277 INFO L82 PathProgramCache]: Analyzing trace with hash 473583309, now seen corresponding path program 2 times [2021-10-13 08:16:19,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:19,278 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1528104528] [2021-10-13 08:16:19,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:16:19,278 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:19,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:19,279 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:19,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-10-13 08:16:19,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:16:19,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:16:19,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-13 08:16:19,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:19,524 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:19,758 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 08:16:19,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:20,743 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:20,744 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:20,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1528104528] [2021-10-13 08:16:20,744 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1528104528] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:20,744 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [580912911] [2021-10-13 08:16:20,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:16:20,745 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:16:20,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:16:20,746 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:16:20,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-10-13 08:16:21,009 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:16:21,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:16:21,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-13 08:16:21,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:21,032 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:21,157 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-10-13 08:16:21,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:22,857 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:22,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [580912911] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:22,858 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124824964] [2021-10-13 08:16:22,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:16:22,858 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:16:22,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:16:22,872 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:16:22,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-10-13 08:16:23,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:16:23,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:16:23,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 21 conjunts are in the unsatisfiable core [2021-10-13 08:16:23,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:23,159 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:23,453 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:23,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:24,537 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:24,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [124824964] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:24,537 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:16:24,537 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 9, 8, 8] total 24 [2021-10-13 08:16:24,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793009895] [2021-10-13 08:16:24,538 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-10-13 08:16:24,538 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:24,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-10-13 08:16:24,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-10-13 08:16:24,539 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 24 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 08:16:28,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:16:28,217 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2021-10-13 08:16:28,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-10-13 08:16:28,221 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 24 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-10-13 08:16:28,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:16:28,222 INFO L225 Difference]: With dead ends: 58 [2021-10-13 08:16:28,222 INFO L226 Difference]: Without dead ends: 52 [2021-10-13 08:16:28,223 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 5251.1ms TimeCoverageRelationStatistics Valid=274, Invalid=1132, Unknown=0, NotChecked=0, Total=1406 [2021-10-13 08:16:28,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-10-13 08:16:28,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 41. [2021-10-13 08:16:28,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 40 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:16:28,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-10-13 08:16:28,226 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 17 [2021-10-13 08:16:28,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:16:28,226 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-10-13 08:16:28,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 24 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 08:16:28,227 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-10-13 08:16:28,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-10-13 08:16:28,228 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:16:28,228 INFO L512 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-10-13 08:16:28,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-10-13 08:16:28,440 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (16)] Ended with exit code 0 [2021-10-13 08:16:28,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2021-10-13 08:16:28,830 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:16:28,831 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:16:28,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:16:28,831 INFO L82 PathProgramCache]: Analyzing trace with hash 302966996, now seen corresponding path program 2 times [2021-10-13 08:16:28,831 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:16:28,831 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [209584572] [2021-10-13 08:16:28,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:16:28,832 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:16:28,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:16:28,833 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:16:28,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-10-13 08:16:29,048 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:16:29,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:16:29,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 13 conjunts are in the unsatisfiable core [2021-10-13 08:16:29,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:29,077 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:29,559 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:29,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:32,046 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:32,046 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:16:32,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [209584572] [2021-10-13 08:16:32,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [209584572] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:32,046 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [701742852] [2021-10-13 08:16:32,046 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:16:32,047 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:16:32,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:16:32,047 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:16:32,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-10-13 08:16:32,414 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:16:32,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:16:32,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 08:16:32,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:32,445 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:33,167 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:33,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:36,484 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:36,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [701742852] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:36,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287520805] [2021-10-13 08:16:36,485 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:16:36,485 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:16:36,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:16:36,488 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:16:36,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-10-13 08:16:36,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:16:36,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:16:36,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 14 conjunts are in the unsatisfiable core [2021-10-13 08:16:36,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:16:36,870 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:16:37,348 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:37,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:16:40,371 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:16:40,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287520805] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:16:40,372 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:16:40,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9, 9, 9, 9] total 34 [2021-10-13 08:16:40,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939128609] [2021-10-13 08:16:40,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-10-13 08:16:40,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:16:40,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-10-13 08:16:40,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=896, Unknown=0, NotChecked=0, Total=1190 [2021-10-13 08:16:40,374 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 35 states, 34 states have (on average 2.735294117647059) internal successors, (93), 35 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:17:04,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:17:04,298 INFO L93 Difference]: Finished difference Result 180 states and 190 transitions. [2021-10-13 08:17:04,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-10-13 08:17:04,301 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 2.735294117647059) internal successors, (93), 35 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-10-13 08:17:04,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:17:04,303 INFO L225 Difference]: With dead ends: 180 [2021-10-13 08:17:04,303 INFO L226 Difference]: Without dead ends: 180 [2021-10-13 08:17:04,305 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 22401.2ms TimeCoverageRelationStatistics Valid=759, Invalid=2103, Unknown=0, NotChecked=0, Total=2862 [2021-10-13 08:17:04,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-10-13 08:17:04,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 65. [2021-10-13 08:17:04,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 63 states have (on average 1.1904761904761905) internal successors, (75), 64 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:17:04,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-10-13 08:17:04,334 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 22 [2021-10-13 08:17:04,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:17:04,335 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-10-13 08:17:04,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 2.735294117647059) internal successors, (93), 35 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:17:04,335 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-10-13 08:17:04,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-10-13 08:17:04,337 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:17:04,339 INFO L512 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:17:04,381 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:04,567 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (20)] Ended with exit code 0 [2021-10-13 08:17:04,773 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (19)] Ended with exit code 0 [2021-10-13 08:17:04,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:17:04,965 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:17:04,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:17:04,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1980037274, now seen corresponding path program 1 times [2021-10-13 08:17:04,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:17:04,966 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [186928588] [2021-10-13 08:17:04,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:17:04,966 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:17:04,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:17:04,967 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:17:04,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-10-13 08:17:05,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:17:05,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-13 08:17:05,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:05,355 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:17:05,862 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:05,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:07,334 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:07,335 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:17:07,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [186928588] [2021-10-13 08:17:07,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [186928588] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:07,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [152876157] [2021-10-13 08:17:07,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:17:07,336 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:17:07,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:17:07,346 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:17:07,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-10-13 08:17:07,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:17:07,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 19 conjunts are in the unsatisfiable core [2021-10-13 08:17:07,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:08,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 27 treesize of output 23 [2021-10-13 08:17:08,785 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 08:17:08,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 23 [2021-10-13 08:17:08,883 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:17:08,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:09,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 17 [2021-10-13 08:17:09,220 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 29 treesize of output 25 [2021-10-13 08:17:09,827 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:17:09,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [152876157] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:09,827 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [265022433] [2021-10-13 08:17:09,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-13 08:17:09,827 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:17:09,827 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:17:09,828 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:17:09,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-10-13 08:17:10,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-13 08:17:10,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 22 conjunts are in the unsatisfiable core [2021-10-13 08:17:10,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:10,316 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:17:10,744 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 54 treesize of output 40 [2021-10-13 08:17:10,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 40 treesize of output 36 [2021-10-13 08:17:10,956 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 08:17:10,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 23 [2021-10-13 08:17:10,986 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:17:10,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:11,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 17 [2021-10-13 08:17:11,158 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 29 treesize of output 25 [2021-10-13 08:17:12,659 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 13 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-10-13 08:17:12,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [265022433] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:12,659 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:17:12,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11, 10, 11, 10] total 41 [2021-10-13 08:17:12,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161789188] [2021-10-13 08:17:12,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-10-13 08:17:12,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:17:12,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-10-13 08:17:12,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1455, Unknown=0, NotChecked=0, Total=1640 [2021-10-13 08:17:12,661 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 41 states, 41 states have (on average 2.073170731707317) internal successors, (85), 41 states have internal predecessors, (85), 0 states have call successors, (0), 0 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 08:17:19,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:17:19,369 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2021-10-13 08:17:19,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-10-13 08:17:19,370 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.073170731707317) internal successors, (85), 41 states have internal predecessors, (85), 0 states have call successors, (0), 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 24 [2021-10-13 08:17:19,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:17:19,371 INFO L225 Difference]: With dead ends: 87 [2021-10-13 08:17:19,371 INFO L226 Difference]: Without dead ends: 80 [2021-10-13 08:17:19,373 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 9707.3ms TimeCoverageRelationStatistics Valid=545, Invalid=2995, Unknown=0, NotChecked=0, Total=3540 [2021-10-13 08:17:19,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-10-13 08:17:19,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2021-10-13 08:17:19,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 70 states have (on average 1.1714285714285715) internal successors, (82), 71 states have internal predecessors, (82), 0 states have call successors, (0), 0 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 08:17:19,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 82 transitions. [2021-10-13 08:17:19,392 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 82 transitions. Word has length 24 [2021-10-13 08:17:19,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:17:19,392 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 82 transitions. [2021-10-13 08:17:19,392 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.073170731707317) internal successors, (85), 41 states have internal predecessors, (85), 0 states have call successors, (0), 0 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 08:17:19,392 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 82 transitions. [2021-10-13 08:17:19,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-10-13 08:17:19,394 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:17:19,394 INFO L512 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:17:19,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:19,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:19,806 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:20,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:17:20,003 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:17:20,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:17:20,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1941489159, now seen corresponding path program 2 times [2021-10-13 08:17:20,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:17:20,004 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1323294513] [2021-10-13 08:17:20,004 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:17:20,004 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:17:20,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:17:20,005 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:17:20,008 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-10-13 08:17:20,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:17:20,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:17:20,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 26 conjunts are in the unsatisfiable core [2021-10-13 08:17:20,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:20,475 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:17:20,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 17 treesize of output 13 [2021-10-13 08:17:21,032 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:17:21,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-10-13 08:17:21,414 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:21,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:22,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 17 treesize of output 15 [2021-10-13 08:17:22,533 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 33 treesize of output 29 [2021-10-13 08:17:23,671 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:23,671 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:17:23,671 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1323294513] [2021-10-13 08:17:23,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1323294513] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:23,672 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1205390575] [2021-10-13 08:17:23,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:17:23,672 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:17:23,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:17:23,673 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:17:23,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-10-13 08:17:24,311 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:17:24,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:17:24,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 24 conjunts are in the unsatisfiable core [2021-10-13 08:17:24,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:24,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 35 treesize of output 31 [2021-10-13 08:17:25,467 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 08:17:25,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 23 [2021-10-13 08:17:25,557 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:25,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:25,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 17 [2021-10-13 08:17:26,008 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 29 treesize of output 25 [2021-10-13 08:17:27,914 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:27,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1205390575] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:27,915 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643420458] [2021-10-13 08:17:27,915 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-10-13 08:17:27,915 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:17:27,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:17:27,915 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:17:27,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-10-13 08:17:28,679 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-10-13 08:17:28,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:17:28,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 27 conjunts are in the unsatisfiable core [2021-10-13 08:17:28,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:28,712 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:17:29,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 17 treesize of output 13 [2021-10-13 08:17:30,002 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-10-13 08:17:30,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 32 [2021-10-13 08:17:30,013 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:30,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:30,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 17 [2021-10-13 08:17:30,811 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 29 treesize of output 25 [2021-10-13 08:17:33,266 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:33,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643420458] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:33,266 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:17:33,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11, 14, 13, 14, 13] total 63 [2021-10-13 08:17:33,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123775234] [2021-10-13 08:17:33,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-10-13 08:17:33,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:17:33,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-10-13 08:17:33,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=3533, Unknown=0, NotChecked=0, Total=3906 [2021-10-13 08:17:33,270 INFO L87 Difference]: Start difference. First operand 72 states and 82 transitions. Second operand has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 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 08:17:45,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:17:45,581 INFO L93 Difference]: Finished difference Result 82 states and 90 transitions. [2021-10-13 08:17:45,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-10-13 08:17:45,582 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 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 25 [2021-10-13 08:17:45,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:17:45,582 INFO L225 Difference]: With dead ends: 82 [2021-10-13 08:17:45,582 INFO L226 Difference]: Without dead ends: 72 [2021-10-13 08:17:45,584 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2532 ImplicationChecksByTransitivity, 18559.5ms TimeCoverageRelationStatistics Valid=1183, Invalid=7007, Unknown=0, NotChecked=0, Total=8190 [2021-10-13 08:17:45,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-10-13 08:17:45,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-10-13 08:17:45,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 70 states have (on average 1.1428571428571428) internal successors, (80), 71 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:17:45,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 80 transitions. [2021-10-13 08:17:45,589 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 80 transitions. Word has length 25 [2021-10-13 08:17:45,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:17:45,589 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 80 transitions. [2021-10-13 08:17:45,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0) internal successors, (126), 63 states have internal predecessors, (126), 0 states have call successors, (0), 0 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 08:17:45,590 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 80 transitions. [2021-10-13 08:17:45,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-13 08:17:45,591 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:17:45,591 INFO L512 BasicCegarLoop]: trace histogram [7, 7, 7, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-13 08:17:45,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:45,817 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:46,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-10-13 08:17:46,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 [2021-10-13 08:17:46,196 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:17:46,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:17:46,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1734681372, now seen corresponding path program 3 times [2021-10-13 08:17:46,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:17:46,196 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [808907553] [2021-10-13 08:17:46,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:17:46,197 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:17:46,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:17:46,197 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:17:46,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-10-13 08:17:47,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-10-13 08:17:47,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:17:47,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 32 conjunts are in the unsatisfiable core [2021-10-13 08:17:47,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:47,115 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:17:47,905 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 19 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:47,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:17:51,343 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-13 08:17:51,343 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:17:51,343 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [808907553] [2021-10-13 08:17:51,343 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [808907553] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:17:51,344 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1097042872] [2021-10-13 08:17:51,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:17:51,344 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:17:51,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:17:51,355 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:17:51,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-10-13 08:17:52,316 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-10-13 08:17:52,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:17:52,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 23 conjunts are in the unsatisfiable core [2021-10-13 08:17:52,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:17:52,347 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:17:52,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 16 treesize of output 12 [2021-10-13 08:17:52,978 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-10-13 08:17:52,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2021-10-13 08:17:53,891 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-10-13 08:17:53,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:18:00,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 45 treesize of output 43 [2021-10-13 08:18:00,912 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 56 treesize of output 54 [2021-10-13 08:18:04,852 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-10-13 08:18:04,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1097042872] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:18:04,852 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1913655212] [2021-10-13 08:18:04,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:18:04,852 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:18:04,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:18:04,853 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:18:04,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-10-13 08:18:05,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-10-13 08:18:05,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:18:05,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 34 conjunts are in the unsatisfiable core [2021-10-13 08:18:05,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:18:05,712 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:18:06,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 17 treesize of output 13 [2021-10-13 08:18:08,218 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 35 treesize of output 27 [2021-10-13 08:18:08,579 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-10-13 08:18:08,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 23 [2021-10-13 08:18:08,723 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 40 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 08:18:08,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:18:10,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 19 treesize of output 17 [2021-10-13 08:18:10,163 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 29 treesize of output 25 [2021-10-13 08:18:16,703 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 40 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-10-13 08:18:16,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1913655212] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:18:16,703 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:18:16,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 8, 7, 17, 17] total 66 [2021-10-13 08:18:16,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213247661] [2021-10-13 08:18:16,704 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-10-13 08:18:16,704 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:18:16,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-10-13 08:18:16,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=3904, Unknown=2, NotChecked=0, Total=4290 [2021-10-13 08:18:16,706 INFO L87 Difference]: Start difference. First operand 72 states and 80 transitions. Second operand has 66 states, 66 states have (on average 2.4393939393939394) internal successors, (161), 66 states have internal predecessors, (161), 0 states have call successors, (0), 0 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 08:18:37,996 WARN L207 SmtUtils]: Spent 11.11 s on a formula simplification. DAG size of input: 100 DAG size of output: 88 [2021-10-13 08:18:52,625 WARN L207 SmtUtils]: Spent 11.42 s on a formula simplification. DAG size of input: 110 DAG size of output: 98 [2021-10-13 08:19:10,446 WARN L207 SmtUtils]: Spent 11.38 s on a formula simplification. DAG size of input: 102 DAG size of output: 90 [2021-10-13 08:19:25,699 WARN L207 SmtUtils]: Spent 10.96 s on a formula simplification. DAG size of input: 106 DAG size of output: 94 [2021-10-13 08:19:39,893 WARN L207 SmtUtils]: Spent 11.52 s on a formula simplification. DAG size of input: 116 DAG size of output: 102 [2021-10-13 08:19:57,401 WARN L207 SmtUtils]: Spent 11.61 s on a formula simplification. DAG size of input: 108 DAG size of output: 94 [2021-10-13 08:20:11,319 WARN L207 SmtUtils]: Spent 10.98 s on a formula simplification. DAG size of input: 107 DAG size of output: 95 [2021-10-13 08:20:32,797 WARN L207 SmtUtils]: Spent 13.27 s on a formula simplification. DAG size of input: 117 DAG size of output: 103 [2021-10-13 08:20:46,846 WARN L207 SmtUtils]: Spent 11.75 s on a formula simplification. DAG size of input: 82 DAG size of output: 74 [2021-10-13 08:21:04,888 WARN L207 SmtUtils]: Spent 11.83 s on a formula simplification. DAG size of input: 109 DAG size of output: 95 [2021-10-13 08:21:24,868 WARN L207 SmtUtils]: Spent 10.79 s on a formula simplification. DAG size of input: 92 DAG size of output: 84 [2021-10-13 08:21:37,828 WARN L207 SmtUtils]: Spent 10.90 s on a formula simplification. DAG size of input: 106 DAG size of output: 94 [2021-10-13 08:21:54,270 WARN L207 SmtUtils]: Spent 10.59 s on a formula simplification. DAG size of input: 84 DAG size of output: 76 [2021-10-13 08:22:08,595 WARN L207 SmtUtils]: Spent 11.48 s on a formula simplification. DAG size of input: 116 DAG size of output: 102 [2021-10-13 08:22:21,285 WARN L207 SmtUtils]: Spent 10.25 s on a formula simplification. DAG size of input: 87 DAG size of output: 79 [2021-10-13 08:22:41,014 WARN L207 SmtUtils]: Spent 11.92 s on a formula simplification. DAG size of input: 108 DAG size of output: 94 [2021-10-13 08:23:00,711 WARN L207 SmtUtils]: Spent 10.86 s on a formula simplification. DAG size of input: 97 DAG size of output: 87 [2021-10-13 08:23:13,868 WARN L207 SmtUtils]: Spent 10.81 s on a formula simplification. DAG size of input: 105 DAG size of output: 93 [2021-10-13 08:23:33,861 WARN L207 SmtUtils]: Spent 12.17 s on a formula simplification. DAG size of input: 89 DAG size of output: 79 [2021-10-13 08:23:47,861 WARN L207 SmtUtils]: Spent 11.62 s on a formula simplification. DAG size of input: 115 DAG size of output: 101 [2021-10-13 08:24:09,610 WARN L207 SmtUtils]: Spent 11.50 s on a formula simplification. DAG size of input: 107 DAG size of output: 93 [2021-10-13 08:24:23,460 WARN L207 SmtUtils]: Spent 11.28 s on a formula simplification. DAG size of input: 103 DAG size of output: 91 [2021-10-13 08:24:37,575 WARN L207 SmtUtils]: Spent 11.63 s on a formula simplification. DAG size of input: 113 DAG size of output: 99 [2021-10-13 08:24:59,050 WARN L207 SmtUtils]: Spent 11.41 s on a formula simplification. DAG size of input: 105 DAG size of output: 87 [2021-10-13 08:25:18,962 WARN L207 SmtUtils]: Spent 11.35 s on a formula simplification. DAG size of input: 99 DAG size of output: 87 [2021-10-13 08:25:31,567 WARN L207 SmtUtils]: Spent 10.26 s on a formula simplification. DAG size of input: 97 DAG size of output: 87 [2021-10-13 08:25:57,542 WARN L207 SmtUtils]: Spent 11.54 s on a formula simplification. DAG size of input: 107 DAG size of output: 95 [2021-10-13 08:25:58,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:25:58,893 INFO L93 Difference]: Finished difference Result 109 states and 116 transitions. [2021-10-13 08:25:58,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-10-13 08:25:58,896 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.4393939393939394) internal successors, (161), 66 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-10-13 08:25:58,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:25:58,897 INFO L225 Difference]: With dead ends: 109 [2021-10-13 08:25:58,897 INFO L226 Difference]: Without dead ends: 47 [2021-10-13 08:25:58,900 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 451047.6ms TimeCoverageRelationStatistics Valid=1791, Invalid=9955, Unknown=26, NotChecked=0, Total=11772 [2021-10-13 08:25:58,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-10-13 08:25:58,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-10-13 08:25:58,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:25:58,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2021-10-13 08:25:58,903 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 41 [2021-10-13 08:25:58,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:25:58,903 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2021-10-13 08:25:58,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.4393939393939394) internal successors, (161), 66 states have internal predecessors, (161), 0 states have call successors, (0), 0 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 08:25:58,904 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2021-10-13 08:25:58,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-10-13 08:25:58,905 INFO L504 BasicCegarLoop]: Found error trace [2021-10-13 08:25:58,905 INFO L512 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1] [2021-10-13 08:25:58,919 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (28)] Ended with exit code 0 [2021-10-13 08:25:59,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-10-13 08:25:59,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-10-13 08:25:59,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:25:59,522 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 3 more)] === [2021-10-13 08:25:59,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-13 08:25:59,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1048882662, now seen corresponding path program 3 times [2021-10-13 08:25:59,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-10-13 08:25:59,525 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1279689766] [2021-10-13 08:25:59,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:25:59,526 INFO L170 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-10-13 08:25:59,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat [2021-10-13 08:25:59,529 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-10-13 08:25:59,537 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-10-13 08:26:00,255 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-10-13 08:26:00,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:26:00,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:26:00,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:26:00,295 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:26:01,132 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 08:26:01,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:26:12,108 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 08:26:12,108 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-10-13 08:26:12,108 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1279689766] [2021-10-13 08:26:12,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1279689766] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:26:12,109 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1449354515] [2021-10-13 08:26:12,109 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:26:12,109 INFO L170 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-10-13 08:26:12,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 [2021-10-13 08:26:12,109 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-10-13 08:26:12,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-10-13 08:26:13,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-10-13 08:26:13,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:26:13,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 12 conjunts are in the unsatisfiable core [2021-10-13 08:26:13,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:26:13,199 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:26:14,333 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 27 proven. 20 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-10-13 08:26:14,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:26:24,326 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 9 proven. 38 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-10-13 08:26:24,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1449354515] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:26:24,326 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850128104] [2021-10-13 08:26:24,326 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-10-13 08:26:24,327 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-13 08:26:24,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 [2021-10-13 08:26:24,330 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-13 08:26:24,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-10-13 08:26:25,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-10-13 08:26:25,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-10-13 08:26:25,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 10 conjunts are in the unsatisfiable core [2021-10-13 08:26:25,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-13 08:26:25,467 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-10-13 08:26:25,969 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 28 proven. 10 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 08:26:25,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-13 08:26:35,426 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2021-10-13 08:26:35,426 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850128104] provided 0 perfect and 2 imperfect interpolant sequences [2021-10-13 08:26:35,427 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-10-13 08:26:35,427 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7, 7, 6, 6] total 16 [2021-10-13 08:26:35,427 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56379938] [2021-10-13 08:26:35,427 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-10-13 08:26:35,427 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-10-13 08:26:35,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-10-13 08:26:35,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2021-10-13 08:26:35,428 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 17 states, 16 states have (on average 2.25) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 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 08:26:36,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-13 08:26:36,267 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2021-10-13 08:26:36,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-10-13 08:26:36,268 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-10-13 08:26:36,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-13 08:26:36,268 INFO L225 Difference]: With dead ends: 46 [2021-10-13 08:26:36,269 INFO L226 Difference]: Without dead ends: 0 [2021-10-13 08:26:36,269 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 2444.3ms TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2021-10-13 08:26:36,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-13 08:26:36,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-13 08:26:36,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-13 08:26:36,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-13 08:26:36,270 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 46 [2021-10-13 08:26:36,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-13 08:26:36,270 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-13 08:26:36,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.25) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 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 08:26:36,271 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-13 08:26:36,271 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-13 08:26:36,273 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATION [2021-10-13 08:26:36,273 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATION [2021-10-13 08:26:36,274 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATION [2021-10-13 08:26:36,274 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATION [2021-10-13 08:26:36,274 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATION [2021-10-13 08:26:36,274 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATION [2021-10-13 08:26:36,274 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_LEAK [2021-10-13 08:26:36,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-10-13 08:26:36,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-10-13 08:26:36,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-10-13 08:26:36,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/cvc4 --incremental --print-success --lang smt [2021-10-13 08:26:36,901 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-13 08:26:36,903 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 08:26:36 BoogieIcfgContainer [2021-10-13 08:26:36,903 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-13 08:26:36,904 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-13 08:26:36,904 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-13 08:26:36,904 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-13 08:26:36,905 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:16:00" (3/4) ... [2021-10-13 08:26:36,908 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-13 08:26:36,919 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-10-13 08:26:36,920 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-10-13 08:26:36,920 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-13 08:26:36,920 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-13 08:26:36,953 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/witness.graphml [2021-10-13 08:26:36,953 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-13 08:26:36,954 INFO L168 Benchmark]: Toolchain (without parser) took 637501.21 ms. Allocated memory was 73.4 MB in the beginning and 98.6 MB in the end (delta: 25.2 MB). Free memory was 53.2 MB in the beginning and 40.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 36.7 MB. Max. memory is 16.1 GB. [2021-10-13 08:26:36,955 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 73.4 MB. Free memory was 53.7 MB in the beginning and 53.7 MB in the end (delta: 53.7 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:26:36,955 INFO L168 Benchmark]: CACSL2BoogieTranslator took 462.75 ms. Allocated memory is still 73.4 MB. Free memory was 53.0 MB in the beginning and 37.0 MB in the end (delta: 16.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-13 08:26:36,956 INFO L168 Benchmark]: Boogie Procedure Inliner took 65.59 ms. Allocated memory is still 73.4 MB. Free memory was 37.0 MB in the beginning and 35.1 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 08:26:36,956 INFO L168 Benchmark]: Boogie Preprocessor took 48.77 ms. Allocated memory is still 73.4 MB. Free memory was 35.1 MB in the beginning and 33.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-13 08:26:36,956 INFO L168 Benchmark]: RCFGBuilder took 408.26 ms. Allocated memory is still 73.4 MB. Free memory was 33.8 MB in the beginning and 47.7 MB in the end (delta: -13.9 MB). Peak memory consumption was 8.7 MB. Max. memory is 16.1 GB. [2021-10-13 08:26:36,957 INFO L168 Benchmark]: TraceAbstraction took 636459.15 ms. Allocated memory was 73.4 MB in the beginning and 98.6 MB in the end (delta: 25.2 MB). Free memory was 47.2 MB in the beginning and 43.4 MB in the end (delta: 3.7 MB). Peak memory consumption was 30.1 MB. Max. memory is 16.1 GB. [2021-10-13 08:26:36,957 INFO L168 Benchmark]: Witness Printer took 49.91 ms. Allocated memory is still 98.6 MB. Free memory was 43.4 MB in the beginning and 40.8 MB in the end (delta: 2.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-13 08:26:36,959 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 73.4 MB. Free memory was 53.7 MB in the beginning and 53.7 MB in the end (delta: 53.7 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 462.75 ms. Allocated memory is still 73.4 MB. Free memory was 53.0 MB in the beginning and 37.0 MB in the end (delta: 16.0 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 65.59 ms. Allocated memory is still 73.4 MB. Free memory was 37.0 MB in the beginning and 35.1 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 48.77 ms. Allocated memory is still 73.4 MB. Free memory was 35.1 MB in the beginning and 33.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 408.26 ms. Allocated memory is still 73.4 MB. Free memory was 33.8 MB in the beginning and 47.7 MB in the end (delta: -13.9 MB). Peak memory consumption was 8.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 636459.15 ms. Allocated memory was 73.4 MB in the beginning and 98.6 MB in the end (delta: 25.2 MB). Free memory was 47.2 MB in the beginning and 43.4 MB in the end (delta: 3.7 MB). Peak memory consumption was 30.1 MB. Max. memory is 16.1 GB. * Witness Printer took 49.91 ms. Allocated memory is still 98.6 MB. Free memory was 43.4 MB in the beginning and 40.8 MB in the end (delta: 2.6 MB). There was no memory consumed. 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 - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 530]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 518]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 522]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 25 locations, 7 error locations. Started 1 CEGAR loops. OverallTime: 636372.5ms, OverallIterations: 16, TraceHistogramMax: 11, EmptinessCheckTime: 37.4ms, AutomataDifference: 514349.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 197 SDtfs, 2249 SDslu, 1055 SDs, 0 SdLazy, 3059 SolverSat, 667 SolverUnsat, 10 SolverUnknown, 0 SolverNotchecked, 41909.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1395 GetRequests, 927 SyntacticMatches, 16 SemanticMatches, 452 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7407 ImplicationChecksByTransitivity, 517152.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=13, InterpolantAutomatonStates: 236, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 117.4ms AutomataMinimizationTime, 16 MinimizatonAttempts, 244 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 208.6ms SsaConstructionTime, 1519.5ms SatisfiabilityAnalysisTime, 103025.6ms InterpolantComputationTime, 651 NumberOfCodeBlocks, 543 NumberOfCodeBlocksAsserted, 65 NumberOfCheckSat, 1238 ConstructedInterpolants, 179 QuantifiedInterpolants, 23990 SizeOfPredicates, 247 NumberOfNonLiveVariables, 1593 ConjunctsInSsa, 505 ConjunctsInUnsatCore, 64 InterpolantComputations, 16 PerfectInterpolantSequences, 1452/2240 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 - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2021-10-13 08:26:37,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bbae2592-35a6-434e-a5cc-9c64b9d441c6/bin/utaipan-q2qaUkNPG8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...