./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ecd70163e84c8e1a236d7543bf55ca7587f7becacb8c522f7caae4b1076f13b5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:26:17,644 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:26:17,647 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:26:17,690 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:26:17,691 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:26:17,696 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:26:17,698 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:26:17,703 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:26:17,706 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:26:17,715 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:26:17,716 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:26:17,718 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:26:17,718 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:26:17,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:26:17,728 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:26:17,734 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:26:17,736 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:26:17,737 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:26:17,739 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:26:17,749 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:26:17,751 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:26:17,753 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:26:17,758 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:26:17,759 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:26:17,763 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:26:17,763 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:26:17,764 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:26:17,766 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:26:17,767 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:26:17,768 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:26:17,769 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:26:17,770 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:26:17,772 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:26:17,773 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:26:17,775 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:26:17,775 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:26:17,776 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:26:17,776 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:26:17,776 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:26:17,777 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:26:17,778 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:26:17,779 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:26:17,829 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:26:17,829 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:26:17,829 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:26:17,829 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:26:17,830 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:26:17,830 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:26:17,831 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:26:17,831 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:26:17,831 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:26:17,836 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:26:17,837 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:26:17,838 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:26:17,838 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:26:17,838 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:26:17,838 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:26:17,838 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:26:17,839 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:26:17,839 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:26:17,840 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:26:17,840 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:26:17,840 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:26:17,840 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:26:17,840 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:26:17,841 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:26:17,841 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:26:17,841 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:26:17,843 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:26:17,843 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:26:17,843 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:26:17,844 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:26:17,844 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:26:17,844 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:26:17,844 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:26:17,845 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:26:17,845 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:26:17,845 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:26:17,845 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:26:17,845 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:26:17,846 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:26:17,846 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:26:17,846 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:26:17,846 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_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ecd70163e84c8e1a236d7543bf55ca7587f7becacb8c522f7caae4b1076f13b5 [2021-11-23 02:26:18,153 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:26:18,175 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:26:18,179 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:26:18,180 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:26:18,181 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:26:18,182 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c [2021-11-23 02:26:18,255 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/data/e8e46d54d/eb728dfa8745403a8bfcfbb88662fa44/FLAG69288f988 [2021-11-23 02:26:18,869 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:26:18,870 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c [2021-11-23 02:26:18,888 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/data/e8e46d54d/eb728dfa8745403a8bfcfbb88662fa44/FLAG69288f988 [2021-11-23 02:26:19,268 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/data/e8e46d54d/eb728dfa8745403a8bfcfbb88662fa44 [2021-11-23 02:26:19,271 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:26:19,273 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:26:19,275 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:26:19,275 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:26:19,279 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:26:19,284 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:26:19" (1/1) ... [2021-11-23 02:26:19,286 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a97666f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:19, skipping insertion in model container [2021-11-23 02:26:19,287 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:26:19" (1/1) ... [2021-11-23 02:26:19,296 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:26:19,362 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:26:19,563 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c[914,927] [2021-11-23 02:26:19,676 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c[7115,7128] [2021-11-23 02:26:19,875 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:26:19,889 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:26:19,909 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c[914,927] [2021-11-23 02:26:19,936 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.11.cil-1.c[7115,7128] [2021-11-23 02:26:19,973 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:26:20,000 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:26:20,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20 WrapperNode [2021-11-23 02:26:20,001 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:26:20,002 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:26:20,002 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:26:20,003 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:26:20,010 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,027 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,103 INFO L137 Inliner]: procedures = 75, calls = 91, calls flagged for inlining = 43, calls inlined = 43, statements flattened = 987 [2021-11-23 02:26:20,104 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:26:20,106 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:26:20,106 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:26:20,106 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:26:20,116 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,116 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,130 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,130 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,168 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,205 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,209 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,219 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:26:20,220 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:26:20,221 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:26:20,221 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:26:20,222 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (1/1) ... [2021-11-23 02:26:20,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:26:20,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:20,254 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:26:20,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:26:20,299 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:26:20,299 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:26:20,300 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:26:20,300 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2021-11-23 02:26:20,300 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2021-11-23 02:26:20,300 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 02:26:20,300 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 02:26:20,300 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 02:26:20,301 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 02:26:20,301 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2021-11-23 02:26:20,301 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2021-11-23 02:26:20,301 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 02:26:20,301 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 02:26:20,302 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 02:26:20,302 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 02:26:20,302 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2021-11-23 02:26:20,302 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2021-11-23 02:26:20,302 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2021-11-23 02:26:20,303 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2021-11-23 02:26:20,303 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2021-11-23 02:26:20,303 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2021-11-23 02:26:20,303 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 02:26:20,303 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 02:26:20,304 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:26:20,304 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 02:26:20,304 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 02:26:20,304 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2021-11-23 02:26:20,304 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2021-11-23 02:26:20,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:26:20,305 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:26:20,305 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 02:26:20,305 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 02:26:20,305 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 02:26:20,306 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 02:26:20,430 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:26:20,432 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:26:21,407 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:26:21,893 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:26:21,893 INFO L301 CfgBuilder]: Removed 18 assume(true) statements. [2021-11-23 02:26:21,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:26:21 BoogieIcfgContainer [2021-11-23 02:26:21,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:26:21,899 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:26:21,899 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:26:21,904 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:26:21,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:26:19" (1/3) ... [2021-11-23 02:26:21,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53466dee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:26:21, skipping insertion in model container [2021-11-23 02:26:21,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:26:20" (2/3) ... [2021-11-23 02:26:21,907 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53466dee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:26:21, skipping insertion in model container [2021-11-23 02:26:21,907 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:26:21" (3/3) ... [2021-11-23 02:26:21,908 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.11.cil-1.c [2021-11-23 02:26:21,918 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:26:21,918 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:26:21,984 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:26:21,992 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:26:21,992 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:26:22,019 INFO L276 IsEmpty]: Start isEmpty. Operand has 255 states, 196 states have (on average 1.5459183673469388) internal successors, (303), 204 states have internal predecessors, (303), 41 states have call successors, (41), 15 states have call predecessors, (41), 15 states have return successors, (41), 39 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-23 02:26:22,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:26:22,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:22,029 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:22,030 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:22,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:22,038 INFO L85 PathProgramCache]: Analyzing trace with hash 58588846, now seen corresponding path program 1 times [2021-11-23 02:26:22,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:22,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059461308] [2021-11-23 02:26:22,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:22,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:22,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:22,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:22,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:22,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059461308] [2021-11-23 02:26:22,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2059461308] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:22,355 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:22,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:26:22,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781158300] [2021-11-23 02:26:22,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:22,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:26:22,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:22,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:26:22,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:26:22,418 INFO L87 Difference]: Start difference. First operand has 255 states, 196 states have (on average 1.5459183673469388) internal successors, (303), 204 states have internal predecessors, (303), 41 states have call successors, (41), 15 states have call predecessors, (41), 15 states have return successors, (41), 39 states have call predecessors, (41), 41 states have call successors, (41) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:26:23,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:23,033 INFO L93 Difference]: Finished difference Result 560 states and 841 transitions. [2021-11-23 02:26:23,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:26:23,036 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-11-23 02:26:23,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:23,060 INFO L225 Difference]: With dead ends: 560 [2021-11-23 02:26:23,060 INFO L226 Difference]: Without dead ends: 309 [2021-11-23 02:26:23,070 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:26:23,076 INFO L933 BasicCegarLoop]: 365 mSDtfsCounter, 431 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 431 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:23,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [431 Valid, 632 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:26:23,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2021-11-23 02:26:23,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 302. [2021-11-23 02:26:23,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 231 states have (on average 1.4545454545454546) internal successors, (336), 236 states have internal predecessors, (336), 49 states have call successors, (49), 22 states have call predecessors, (49), 20 states have return successors, (45), 45 states have call predecessors, (45), 45 states have call successors, (45) [2021-11-23 02:26:23,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 430 transitions. [2021-11-23 02:26:23,205 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 430 transitions. Word has length 45 [2021-11-23 02:26:23,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:23,206 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 430 transitions. [2021-11-23 02:26:23,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:26:23,207 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 430 transitions. [2021-11-23 02:26:23,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 02:26:23,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:23,214 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:23,215 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:26:23,215 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:23,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:23,220 INFO L85 PathProgramCache]: Analyzing trace with hash 977563469, now seen corresponding path program 1 times [2021-11-23 02:26:23,221 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:23,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936912327] [2021-11-23 02:26:23,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:23,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:23,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:23,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:23,396 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:23,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936912327] [2021-11-23 02:26:23,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936912327] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:23,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:23,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:26:23,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925898873] [2021-11-23 02:26:23,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:23,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:26:23,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:23,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:26:23,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:26:23,413 INFO L87 Difference]: Start difference. First operand 302 states and 430 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:26:24,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:24,200 INFO L93 Difference]: Finished difference Result 704 states and 933 transitions. [2021-11-23 02:26:24,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:26:24,201 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2021-11-23 02:26:24,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:24,211 INFO L225 Difference]: With dead ends: 704 [2021-11-23 02:26:24,211 INFO L226 Difference]: Without dead ends: 572 [2021-11-23 02:26:24,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:26:24,218 INFO L933 BasicCegarLoop]: 442 mSDtfsCounter, 888 mSDsluCounter, 850 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 892 SdHoareTripleChecker+Valid, 1124 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 272 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:24,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [892 Valid, 1124 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [272 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:26:24,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2021-11-23 02:26:24,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 488. [2021-11-23 02:26:24,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 363 states have (on average 1.3663911845730028) internal successors, (496), 369 states have internal predecessors, (496), 76 states have call successors, (76), 45 states have call predecessors, (76), 47 states have return successors, (76), 75 states have call predecessors, (76), 72 states have call successors, (76) [2021-11-23 02:26:24,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 648 transitions. [2021-11-23 02:26:24,299 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 648 transitions. Word has length 45 [2021-11-23 02:26:24,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:24,300 INFO L470 AbstractCegarLoop]: Abstraction has 488 states and 648 transitions. [2021-11-23 02:26:24,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-23 02:26:24,301 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 648 transitions. [2021-11-23 02:26:24,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:26:24,309 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:24,309 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:24,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:26:24,310 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:24,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:24,310 INFO L85 PathProgramCache]: Analyzing trace with hash 1338578503, now seen corresponding path program 1 times [2021-11-23 02:26:24,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:24,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27922459] [2021-11-23 02:26:24,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:24,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:24,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:24,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:24,474 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:24,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27922459] [2021-11-23 02:26:24,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27922459] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:24,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:24,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:26:24,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607903697] [2021-11-23 02:26:24,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:24,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:26:24,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:24,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:26:24,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:26:24,478 INFO L87 Difference]: Start difference. First operand 488 states and 648 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:26:25,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:25,359 INFO L93 Difference]: Finished difference Result 1004 states and 1264 transitions. [2021-11-23 02:26:25,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:26:25,360 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-11-23 02:26:25,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:25,366 INFO L225 Difference]: With dead ends: 1004 [2021-11-23 02:26:25,367 INFO L226 Difference]: Without dead ends: 702 [2021-11-23 02:26:25,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:26:25,370 INFO L933 BasicCegarLoop]: 290 mSDtfsCounter, 517 mSDsluCounter, 1086 mSDsCounter, 0 mSdLazyCounter, 973 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 1081 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:25,370 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [547 Valid, 1191 Invalid, 1081 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 973 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:26:25,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-11-23 02:26:25,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 667. [2021-11-23 02:26:25,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 667 states, 488 states have (on average 1.3278688524590163) internal successors, (648), 495 states have internal predecessors, (648), 103 states have call successors, (103), 68 states have call predecessors, (103), 74 states have return successors, (107), 105 states have call predecessors, (107), 99 states have call successors, (107) [2021-11-23 02:26:25,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 667 states to 667 states and 858 transitions. [2021-11-23 02:26:25,428 INFO L78 Accepts]: Start accepts. Automaton has 667 states and 858 transitions. Word has length 46 [2021-11-23 02:26:25,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:25,429 INFO L470 AbstractCegarLoop]: Abstraction has 667 states and 858 transitions. [2021-11-23 02:26:25,429 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-11-23 02:26:25,429 INFO L276 IsEmpty]: Start isEmpty. Operand 667 states and 858 transitions. [2021-11-23 02:26:25,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:26:25,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:25,431 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:25,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:26:25,432 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:25,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:25,433 INFO L85 PathProgramCache]: Analyzing trace with hash -771161650, now seen corresponding path program 1 times [2021-11-23 02:26:25,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:25,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069344339] [2021-11-23 02:26:25,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:25,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:25,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:25,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:25,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:25,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069344339] [2021-11-23 02:26:25,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069344339] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:25,511 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:25,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:25,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930648554] [2021-11-23 02:26:25,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:25,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:25,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:25,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:25,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:25,513 INFO L87 Difference]: Start difference. First operand 667 states and 858 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:25,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:25,696 INFO L93 Difference]: Finished difference Result 1231 states and 1528 transitions. [2021-11-23 02:26:25,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:25,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2021-11-23 02:26:25,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:25,703 INFO L225 Difference]: With dead ends: 1231 [2021-11-23 02:26:25,703 INFO L226 Difference]: Without dead ends: 799 [2021-11-23 02:26:25,705 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:25,706 INFO L933 BasicCegarLoop]: 321 mSDtfsCounter, 67 mSDsluCounter, 338 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 604 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:25,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 604 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:25,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-23 02:26:25,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 694. [2021-11-23 02:26:25,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 694 states, 511 states have (on average 1.3170254403131116) internal successors, (673), 518 states have internal predecessors, (673), 105 states have call successors, (105), 70 states have call predecessors, (105), 76 states have return successors, (109), 107 states have call predecessors, (109), 101 states have call successors, (109) [2021-11-23 02:26:25,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 887 transitions. [2021-11-23 02:26:25,769 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 887 transitions. Word has length 47 [2021-11-23 02:26:25,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:25,770 INFO L470 AbstractCegarLoop]: Abstraction has 694 states and 887 transitions. [2021-11-23 02:26:25,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:25,770 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 887 transitions. [2021-11-23 02:26:25,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:26:25,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:25,772 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:25,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:26:25,773 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:25,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:25,773 INFO L85 PathProgramCache]: Analyzing trace with hash 1907084848, now seen corresponding path program 1 times [2021-11-23 02:26:25,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:25,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501786392] [2021-11-23 02:26:25,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:25,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:25,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:25,823 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:26:25,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:25,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501786392] [2021-11-23 02:26:25,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501786392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:25,824 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:25,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:26:25,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478367509] [2021-11-23 02:26:25,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:25,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:26:25,825 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:25,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:26:25,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:25,827 INFO L87 Difference]: Start difference. First operand 694 states and 887 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:25,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:25,962 INFO L93 Difference]: Finished difference Result 884 states and 1108 transitions. [2021-11-23 02:26:25,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:26:25,963 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 53 [2021-11-23 02:26:25,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:25,968 INFO L225 Difference]: With dead ends: 884 [2021-11-23 02:26:25,968 INFO L226 Difference]: Without dead ends: 611 [2021-11-23 02:26:25,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:26:25,971 INFO L933 BasicCegarLoop]: 319 mSDtfsCounter, 336 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:25,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [336 Valid, 380 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:26:25,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-11-23 02:26:26,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 502. [2021-11-23 02:26:26,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 371 states have (on average 1.3234501347708896) internal successors, (491), 376 states have internal predecessors, (491), 81 states have call successors, (81), 50 states have call predecessors, (81), 48 states have return successors, (77), 77 states have call predecessors, (77), 77 states have call successors, (77) [2021-11-23 02:26:26,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 649 transitions. [2021-11-23 02:26:26,030 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 649 transitions. Word has length 53 [2021-11-23 02:26:26,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:26,031 INFO L470 AbstractCegarLoop]: Abstraction has 502 states and 649 transitions. [2021-11-23 02:26:26,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:26:26,031 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 649 transitions. [2021-11-23 02:26:26,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:26:26,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:26,033 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:26,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:26:26,038 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:26,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:26,039 INFO L85 PathProgramCache]: Analyzing trace with hash -549814299, now seen corresponding path program 1 times [2021-11-23 02:26:26,039 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:26,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786196152] [2021-11-23 02:26:26,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:26,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:26,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:26,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:26,095 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:26,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786196152] [2021-11-23 02:26:26,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786196152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:26:26,096 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:26:26,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:26:26,097 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454489206] [2021-11-23 02:26:26,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:26:26,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:26:26,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:26,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:26:26,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:26:26,099 INFO L87 Difference]: Start difference. First operand 502 states and 649 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:26:26,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:26:26,436 INFO L93 Difference]: Finished difference Result 605 states and 765 transitions. [2021-11-23 02:26:26,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:26:26,437 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 54 [2021-11-23 02:26:26,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:26:26,442 INFO L225 Difference]: With dead ends: 605 [2021-11-23 02:26:26,442 INFO L226 Difference]: Without dead ends: 602 [2021-11-23 02:26:26,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:26:26,444 INFO L933 BasicCegarLoop]: 316 mSDtfsCounter, 609 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 609 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:26:26,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [609 Valid, 356 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:26:26,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2021-11-23 02:26:26,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 501. [2021-11-23 02:26:26,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 371 states have (on average 1.3153638814016173) internal successors, (488), 375 states have internal predecessors, (488), 80 states have call successors, (80), 50 states have call predecessors, (80), 48 states have return successors, (77), 77 states have call predecessors, (77), 77 states have call successors, (77) [2021-11-23 02:26:26,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 645 transitions. [2021-11-23 02:26:26,505 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 645 transitions. Word has length 54 [2021-11-23 02:26:26,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:26:26,508 INFO L470 AbstractCegarLoop]: Abstraction has 501 states and 645 transitions. [2021-11-23 02:26:26,508 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:26:26,508 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 645 transitions. [2021-11-23 02:26:26,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 02:26:26,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:26:26,511 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:26:26,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:26:26,512 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:26:26,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:26:26,513 INFO L85 PathProgramCache]: Analyzing trace with hash 134237751, now seen corresponding path program 1 times [2021-11-23 02:26:26,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:26:26,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254603131] [2021-11-23 02:26:26,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:26,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:26:26,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:26,659 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:26,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:26:26,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254603131] [2021-11-23 02:26:26,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254603131] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:26:26,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637249714] [2021-11-23 02:26:26,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:26:26,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:26:26,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:26:26,663 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:26:26,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:26:26,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:26:26,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:26:26,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:26:27,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:27,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:27,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:26:27,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637249714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:27,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1568349781] [2021-11-23 02:26:27,669 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-23 02:26:27,669 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:27,674 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:27,681 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:27,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:34,696 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 195 for LOIs [2021-11-23 02:26:34,741 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 163 for LOIs [2021-11-23 02:26:34,769 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 191 for LOIs [2021-11-23 02:26:34,798 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 199 for LOIs [2021-11-23 02:26:35,770 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 195 for LOIs [2021-11-23 02:26:35,879 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 195 for LOIs [2021-11-23 02:26:35,998 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 195 for LOIs [2021-11-23 02:26:36,046 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 202 for LOIs [2021-11-23 02:26:36,090 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:27:00,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12498#(and (= ~q_req_up~0 1) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~T11_E~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t8_pc~0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~E_10~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~T9_E~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t2_i~0 0) (= 0 ~t8_st~0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~E_11~0 2) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (= ~m_i~0 0) (= ~t10_st~0 0) (= ~t10_pc~0 0) (= 0 ~t9_pc~0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~t11_pc~0 0) (= ~p_dw_pc~0 1) (= ~t11_i~0 0) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~t8_i~0 0) (= ~token~0 0) (= ~c_dr_pc~0 0) (= 2 ~p_dw_st~0) (= ~m_pc~0 0) (= 0 ~t9_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~t11_st~0 0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~T8_E~0 2) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~E_9~0 2) (= ~c_dr_st~0 1) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 02:27:00,770 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:27:00,770 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:27:00,770 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2021-11-23 02:27:00,770 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170914951] [2021-11-23 02:27:00,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:27:00,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:27:00,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:00,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:27:00,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:27:00,774 INFO L87 Difference]: Start difference. First operand 501 states and 645 transitions. Second operand has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 7 states have internal predecessors, (79), 4 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2021-11-23 02:27:01,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:01,396 INFO L93 Difference]: Finished difference Result 1074 states and 1300 transitions. [2021-11-23 02:27:01,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:27:01,397 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 7 states have internal predecessors, (79), 4 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) Word has length 55 [2021-11-23 02:27:01,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:01,406 INFO L225 Difference]: With dead ends: 1074 [2021-11-23 02:27:01,406 INFO L226 Difference]: Without dead ends: 1071 [2021-11-23 02:27:01,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 24.7s TimeCoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:27:01,409 INFO L933 BasicCegarLoop]: 421 mSDtfsCounter, 834 mSDsluCounter, 1098 mSDsCounter, 0 mSdLazyCounter, 693 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 834 SdHoareTripleChecker+Valid, 1293 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 693 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:01,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [834 Valid, 1293 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 693 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:27:01,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1071 states. [2021-11-23 02:27:01,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1071 to 796. [2021-11-23 02:27:01,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 796 states, 576 states have (on average 1.2690972222222223) internal successors, (731), 580 states have internal predecessors, (731), 128 states have call successors, (128), 92 states have call predecessors, (128), 90 states have return successors, (125), 125 states have call predecessors, (125), 125 states have call successors, (125) [2021-11-23 02:27:01,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 796 states to 796 states and 984 transitions. [2021-11-23 02:27:01,480 INFO L78 Accepts]: Start accepts. Automaton has 796 states and 984 transitions. Word has length 55 [2021-11-23 02:27:01,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:01,481 INFO L470 AbstractCegarLoop]: Abstraction has 796 states and 984 transitions. [2021-11-23 02:27:01,481 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 7 states have internal predecessors, (79), 4 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2021-11-23 02:27:01,481 INFO L276 IsEmpty]: Start isEmpty. Operand 796 states and 984 transitions. [2021-11-23 02:27:01,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 02:27:01,483 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:01,483 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:01,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:01,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:01,700 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:01,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:01,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1114456347, now seen corresponding path program 2 times [2021-11-23 02:27:01,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:01,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474269216] [2021-11-23 02:27:01,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:01,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:01,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:01,755 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:01,756 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:01,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474269216] [2021-11-23 02:27:01,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474269216] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:01,756 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:01,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:27:01,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450124802] [2021-11-23 02:27:01,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:01,757 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:27:01,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:01,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:27:01,758 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:27:01,758 INFO L87 Difference]: Start difference. First operand 796 states and 984 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:27:01,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:01,915 INFO L93 Difference]: Finished difference Result 1209 states and 1457 transitions. [2021-11-23 02:27:01,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:27:01,916 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 58 [2021-11-23 02:27:01,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:01,923 INFO L225 Difference]: With dead ends: 1209 [2021-11-23 02:27:01,923 INFO L226 Difference]: Without dead ends: 798 [2021-11-23 02:27:01,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:27:01,925 INFO L933 BasicCegarLoop]: 347 mSDtfsCounter, 339 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:01,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 413 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:01,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 798 states. [2021-11-23 02:27:02,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 798 to 792. [2021-11-23 02:27:02,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 792 states, 572 states have (on average 1.256993006993007) internal successors, (719), 576 states have internal predecessors, (719), 128 states have call successors, (128), 92 states have call predecessors, (128), 90 states have return successors, (125), 125 states have call predecessors, (125), 125 states have call successors, (125) [2021-11-23 02:27:02,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 972 transitions. [2021-11-23 02:27:02,020 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 972 transitions. Word has length 58 [2021-11-23 02:27:02,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:02,021 INFO L470 AbstractCegarLoop]: Abstraction has 792 states and 972 transitions. [2021-11-23 02:27:02,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 02:27:02,021 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 972 transitions. [2021-11-23 02:27:02,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:27:02,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:02,023 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:02,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:27:02,023 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:02,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:02,024 INFO L85 PathProgramCache]: Analyzing trace with hash 365175705, now seen corresponding path program 1 times [2021-11-23 02:27:02,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:02,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753787222] [2021-11-23 02:27:02,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:02,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:02,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:02,080 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:27:02,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:02,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753787222] [2021-11-23 02:27:02,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753787222] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:02,081 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:02,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:27:02,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644518813] [2021-11-23 02:27:02,082 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:02,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:27:02,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:02,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:27:02,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:27:02,084 INFO L87 Difference]: Start difference. First operand 792 states and 972 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:27:02,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:02,289 INFO L93 Difference]: Finished difference Result 1411 states and 1682 transitions. [2021-11-23 02:27:02,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:27:02,290 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 61 [2021-11-23 02:27:02,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:02,298 INFO L225 Difference]: With dead ends: 1411 [2021-11-23 02:27:02,298 INFO L226 Difference]: Without dead ends: 1048 [2021-11-23 02:27:02,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:27:02,302 INFO L933 BasicCegarLoop]: 340 mSDtfsCounter, 42 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 640 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:02,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 640 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:02,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1048 states. [2021-11-23 02:27:02,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1048 to 867. [2021-11-23 02:27:02,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 633 states have (on average 1.25434439178515) internal successors, (794), 637 states have internal predecessors, (794), 135 states have call successors, (135), 99 states have call predecessors, (135), 97 states have return successors, (132), 132 states have call predecessors, (132), 132 states have call successors, (132) [2021-11-23 02:27:02,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1061 transitions. [2021-11-23 02:27:02,385 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1061 transitions. Word has length 61 [2021-11-23 02:27:02,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:02,386 INFO L470 AbstractCegarLoop]: Abstraction has 867 states and 1061 transitions. [2021-11-23 02:27:02,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:27:02,386 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1061 transitions. [2021-11-23 02:27:02,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 02:27:02,388 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:02,388 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:02,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:27:02,389 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:02,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:02,389 INFO L85 PathProgramCache]: Analyzing trace with hash -990845396, now seen corresponding path program 1 times [2021-11-23 02:27:02,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:02,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420527508] [2021-11-23 02:27:02,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:02,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:02,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:02,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:27:02,475 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:02,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420527508] [2021-11-23 02:27:02,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420527508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:02,475 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:02,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:27:02,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558048337] [2021-11-23 02:27:02,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:02,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:27:02,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:02,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:27:02,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:27:02,477 INFO L87 Difference]: Start difference. First operand 867 states and 1061 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:27:03,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:03,511 INFO L93 Difference]: Finished difference Result 1700 states and 2439 transitions. [2021-11-23 02:27:03,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:27:03,512 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 65 [2021-11-23 02:27:03,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:03,525 INFO L225 Difference]: With dead ends: 1700 [2021-11-23 02:27:03,525 INFO L226 Difference]: Without dead ends: 1525 [2021-11-23 02:27:03,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:27:03,529 INFO L933 BasicCegarLoop]: 588 mSDtfsCounter, 1365 mSDsluCounter, 995 mSDsCounter, 0 mSdLazyCounter, 632 mSolverCounterSat, 285 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1381 SdHoareTripleChecker+Valid, 1397 SdHoareTripleChecker+Invalid, 917 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 285 IncrementalHoareTripleChecker+Valid, 632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:03,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1381 Valid, 1397 Invalid, 917 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [285 Valid, 632 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:27:03,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1525 states. [2021-11-23 02:27:03,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1525 to 1512. [2021-11-23 02:27:03,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1512 states, 1173 states have (on average 1.3793691389599319) internal successors, (1618), 1180 states have internal predecessors, (1618), 216 states have call successors, (216), 123 states have call predecessors, (216), 121 states have return successors, (271), 210 states have call predecessors, (271), 213 states have call successors, (271) [2021-11-23 02:27:03,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1512 states to 1512 states and 2105 transitions. [2021-11-23 02:27:03,666 INFO L78 Accepts]: Start accepts. Automaton has 1512 states and 2105 transitions. Word has length 65 [2021-11-23 02:27:03,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:03,666 INFO L470 AbstractCegarLoop]: Abstraction has 1512 states and 2105 transitions. [2021-11-23 02:27:03,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:27:03,667 INFO L276 IsEmpty]: Start isEmpty. Operand 1512 states and 2105 transitions. [2021-11-23 02:27:03,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 02:27:03,669 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:03,669 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:03,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:27:03,669 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:03,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:03,670 INFO L85 PathProgramCache]: Analyzing trace with hash 1936092051, now seen corresponding path program 1 times [2021-11-23 02:27:03,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:03,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437451492] [2021-11-23 02:27:03,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:03,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:03,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:03,737 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:27:03,737 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:03,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437451492] [2021-11-23 02:27:03,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437451492] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:03,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:03,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 02:27:03,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605562785] [2021-11-23 02:27:03,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:03,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:27:03,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:03,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:27:03,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:27:03,752 INFO L87 Difference]: Start difference. First operand 1512 states and 2105 transitions. Second operand has 8 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:27:04,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:04,651 INFO L93 Difference]: Finished difference Result 2561 states and 3288 transitions. [2021-11-23 02:27:04,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:27:04,652 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 70 [2021-11-23 02:27:04,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:04,669 INFO L225 Difference]: With dead ends: 2561 [2021-11-23 02:27:04,669 INFO L226 Difference]: Without dead ends: 1880 [2021-11-23 02:27:04,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:27:04,674 INFO L933 BasicCegarLoop]: 283 mSDtfsCounter, 499 mSDsluCounter, 880 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 528 SdHoareTripleChecker+Valid, 1019 SdHoareTripleChecker+Invalid, 974 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:04,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [528 Valid, 1019 Invalid, 974 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:27:04,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1880 states. [2021-11-23 02:27:04,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1880 to 1831. [2021-11-23 02:27:04,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1831 states, 1387 states have (on average 1.3366979091564528) internal successors, (1854), 1394 states have internal predecessors, (1854), 272 states have call successors, (272), 172 states have call predecessors, (272), 170 states have return successors, (327), 266 states have call predecessors, (327), 269 states have call successors, (327) [2021-11-23 02:27:04,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1831 states to 1831 states and 2453 transitions. [2021-11-23 02:27:04,862 INFO L78 Accepts]: Start accepts. Automaton has 1831 states and 2453 transitions. Word has length 70 [2021-11-23 02:27:04,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:04,863 INFO L470 AbstractCegarLoop]: Abstraction has 1831 states and 2453 transitions. [2021-11-23 02:27:04,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:27:04,864 INFO L276 IsEmpty]: Start isEmpty. Operand 1831 states and 2453 transitions. [2021-11-23 02:27:04,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:27:04,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:04,871 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:04,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 02:27:04,871 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:04,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:04,872 INFO L85 PathProgramCache]: Analyzing trace with hash 75583325, now seen corresponding path program 1 times [2021-11-23 02:27:04,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:04,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206751968] [2021-11-23 02:27:04,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:04,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:04,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:04,931 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:27:04,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:04,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206751968] [2021-11-23 02:27:04,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206751968] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:04,932 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:27:04,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:27:04,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737047656] [2021-11-23 02:27:04,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:04,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:27:04,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:04,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:27:04,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:27:04,934 INFO L87 Difference]: Start difference. First operand 1831 states and 2453 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:27:05,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:05,215 INFO L93 Difference]: Finished difference Result 2797 states and 3547 transitions. [2021-11-23 02:27:05,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:27:05,218 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2021-11-23 02:27:05,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:05,232 INFO L225 Difference]: With dead ends: 2797 [2021-11-23 02:27:05,233 INFO L226 Difference]: Without dead ends: 2007 [2021-11-23 02:27:05,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:27:05,236 INFO L933 BasicCegarLoop]: 334 mSDtfsCounter, 37 mSDsluCounter, 355 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 634 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:05,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 634 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:27:05,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2007 states. [2021-11-23 02:27:05,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2007 to 1878. [2021-11-23 02:27:05,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1878 states, 1426 states have (on average 1.332398316970547) internal successors, (1900), 1433 states have internal predecessors, (1900), 276 states have call successors, (276), 176 states have call predecessors, (276), 174 states have return successors, (331), 270 states have call predecessors, (331), 273 states have call successors, (331) [2021-11-23 02:27:05,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1878 states to 1878 states and 2507 transitions. [2021-11-23 02:27:05,404 INFO L78 Accepts]: Start accepts. Automaton has 1878 states and 2507 transitions. Word has length 71 [2021-11-23 02:27:05,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:05,404 INFO L470 AbstractCegarLoop]: Abstraction has 1878 states and 2507 transitions. [2021-11-23 02:27:05,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:27:05,405 INFO L276 IsEmpty]: Start isEmpty. Operand 1878 states and 2507 transitions. [2021-11-23 02:27:05,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-23 02:27:05,408 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:05,408 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:05,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:27:05,409 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:05,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:05,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1443046220, now seen corresponding path program 1 times [2021-11-23 02:27:05,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:05,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612377417] [2021-11-23 02:27:05,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:05,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:05,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:05,576 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-23 02:27:05,576 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:05,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612377417] [2021-11-23 02:27:05,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612377417] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:05,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283005000] [2021-11-23 02:27:05,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:05,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:05,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:05,583 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:05,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:27:05,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:05,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:27:05,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:05,916 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:27:05,917 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:05,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283005000] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:05,917 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:05,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2021-11-23 02:27:05,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146951653] [2021-11-23 02:27:05,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:05,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:05,917 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:05,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:05,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:27:05,918 INFO L87 Difference]: Start difference. First operand 1878 states and 2507 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:27:06,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:06,281 INFO L93 Difference]: Finished difference Result 2742 states and 3512 transitions. [2021-11-23 02:27:06,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:27:06,282 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2021-11-23 02:27:06,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:06,295 INFO L225 Difference]: With dead ends: 2742 [2021-11-23 02:27:06,295 INFO L226 Difference]: Without dead ends: 1695 [2021-11-23 02:27:06,299 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:27:06,300 INFO L933 BasicCegarLoop]: 349 mSDtfsCounter, 333 mSDsluCounter, 1223 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 1386 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:06,300 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 1386 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:06,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1695 states. [2021-11-23 02:27:06,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1695 to 1510. [2021-11-23 02:27:06,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1510 states, 1189 states have (on average 1.3708999158957107) internal successors, (1630), 1196 states have internal predecessors, (1630), 205 states have call successors, (205), 116 states have call predecessors, (205), 114 states have return successors, (260), 199 states have call predecessors, (260), 202 states have call successors, (260) [2021-11-23 02:27:06,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1510 states to 1510 states and 2095 transitions. [2021-11-23 02:27:06,463 INFO L78 Accepts]: Start accepts. Automaton has 1510 states and 2095 transitions. Word has length 102 [2021-11-23 02:27:06,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:06,463 INFO L470 AbstractCegarLoop]: Abstraction has 1510 states and 2095 transitions. [2021-11-23 02:27:06,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:27:06,464 INFO L276 IsEmpty]: Start isEmpty. Operand 1510 states and 2095 transitions. [2021-11-23 02:27:06,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-23 02:27:06,467 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:06,468 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:06,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:06,687 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:06,688 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:06,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:06,688 INFO L85 PathProgramCache]: Analyzing trace with hash 657023516, now seen corresponding path program 1 times [2021-11-23 02:27:06,688 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:06,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223673369] [2021-11-23 02:27:06,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:06,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:06,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:27:06,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:06,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223673369] [2021-11-23 02:27:06,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223673369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:06,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078695154] [2021-11-23 02:27:06,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:06,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:06,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:06,790 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:06,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:27:06,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:06,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:27:06,948 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:07,200 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:27:07,200 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:07,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078695154] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:07,200 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:07,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 13 [2021-11-23 02:27:07,203 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209740409] [2021-11-23 02:27:07,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:07,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:27:07,204 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:07,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:27:07,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:27:07,205 INFO L87 Difference]: Start difference. First operand 1510 states and 2095 transitions. Second operand has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:27:07,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:07,588 INFO L93 Difference]: Finished difference Result 2059 states and 2720 transitions. [2021-11-23 02:27:07,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:27:07,589 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 112 [2021-11-23 02:27:07,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:07,600 INFO L225 Difference]: With dead ends: 2059 [2021-11-23 02:27:07,600 INFO L226 Difference]: Without dead ends: 1466 [2021-11-23 02:27:07,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:27:07,604 INFO L933 BasicCegarLoop]: 347 mSDtfsCounter, 66 mSDsluCounter, 1539 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 1647 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:07,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 1647 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:07,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1466 states. [2021-11-23 02:27:07,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1466 to 1374. [2021-11-23 02:27:07,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1374 states, 1089 states have (on average 1.3893480257116622) internal successors, (1513), 1096 states have internal predecessors, (1513), 186 states have call successors, (186), 99 states have call predecessors, (186), 97 states have return successors, (241), 180 states have call predecessors, (241), 183 states have call successors, (241) [2021-11-23 02:27:07,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1374 states to 1374 states and 1940 transitions. [2021-11-23 02:27:07,724 INFO L78 Accepts]: Start accepts. Automaton has 1374 states and 1940 transitions. Word has length 112 [2021-11-23 02:27:07,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:07,724 INFO L470 AbstractCegarLoop]: Abstraction has 1374 states and 1940 transitions. [2021-11-23 02:27:07,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-23 02:27:07,725 INFO L276 IsEmpty]: Start isEmpty. Operand 1374 states and 1940 transitions. [2021-11-23 02:27:07,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-23 02:27:07,730 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:07,730 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:07,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:07,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:07,955 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:07,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:07,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1218796345, now seen corresponding path program 1 times [2021-11-23 02:27:07,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:07,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530647445] [2021-11-23 02:27:07,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:07,956 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:07,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:08,055 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:27:08,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:08,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530647445] [2021-11-23 02:27:08,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530647445] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:08,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621025483] [2021-11-23 02:27:08,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:08,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:08,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:08,057 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:08,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:27:08,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:08,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:27:08,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:08,402 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:27:08,403 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:27:08,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621025483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:27:08,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:27:08,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 11 [2021-11-23 02:27:08,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936885976] [2021-11-23 02:27:08,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:27:08,404 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:27:08,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:27:08,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:27:08,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:27:08,406 INFO L87 Difference]: Start difference. First operand 1374 states and 1940 transitions. Second operand has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-23 02:27:08,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:27:08,737 INFO L93 Difference]: Finished difference Result 2123 states and 2785 transitions. [2021-11-23 02:27:08,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:27:08,739 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 113 [2021-11-23 02:27:08,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:27:08,752 INFO L225 Difference]: With dead ends: 2123 [2021-11-23 02:27:08,753 INFO L226 Difference]: Without dead ends: 1666 [2021-11-23 02:27:08,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-11-23 02:27:08,758 INFO L933 BasicCegarLoop]: 336 mSDtfsCounter, 319 mSDsluCounter, 1266 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 1404 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:27:08,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 1404 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:27:08,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1666 states. [2021-11-23 02:27:08,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1666 to 1632. [2021-11-23 02:27:08,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1632 states, 1251 states have (on average 1.3533173461231016) internal successors, (1693), 1264 states have internal predecessors, (1693), 234 states have call successors, (234), 141 states have call predecessors, (234), 145 states have return successors, (301), 228 states have call predecessors, (301), 231 states have call successors, (301) [2021-11-23 02:27:08,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1632 states to 1632 states and 2228 transitions. [2021-11-23 02:27:08,920 INFO L78 Accepts]: Start accepts. Automaton has 1632 states and 2228 transitions. Word has length 113 [2021-11-23 02:27:08,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:27:08,920 INFO L470 AbstractCegarLoop]: Abstraction has 1632 states and 2228 transitions. [2021-11-23 02:27:08,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 14.0) internal successors, (70), 5 states have internal predecessors, (70), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-23 02:27:08,921 INFO L276 IsEmpty]: Start isEmpty. Operand 1632 states and 2228 transitions. [2021-11-23 02:27:08,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-23 02:27:08,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:27:08,925 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:27:08,963 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:27:09,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:27:09,140 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:27:09,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:27:09,140 INFO L85 PathProgramCache]: Analyzing trace with hash -1780700868, now seen corresponding path program 1 times [2021-11-23 02:27:09,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:27:09,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338845725] [2021-11-23 02:27:09,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:09,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:27:09,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:09,554 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:27:09,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:27:09,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338845725] [2021-11-23 02:27:09,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338845725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:27:09,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081969320] [2021-11-23 02:27:09,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:27:09,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:27:09,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:27:09,563 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:27:09,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:27:09,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:27:09,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 02:27:09,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:27:10,866 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 31 proven. 24 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:27:10,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:27:12,764 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 22 proven. 13 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:27:12,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081969320] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:27:12,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [619781189] [2021-11-23 02:27:12,769 INFO L159 IcfgInterpreter]: Started Sifa with 68 locations of interest [2021-11-23 02:27:12,769 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:27:12,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:27:12,770 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:27:12,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:42,254 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 353 for LOIs [2021-11-23 02:28:42,814 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 304 for LOIs [2021-11-23 02:28:42,923 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 295 for LOIs [2021-11-23 02:28:43,038 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 365 for LOIs [2021-11-23 02:28:46,032 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 203 for LOIs [2021-11-23 02:28:46,443 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 149 for LOIs [2021-11-23 02:28:46,822 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 357 for LOIs [2021-11-23 02:28:47,634 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 380 for LOIs [2021-11-23 02:28:48,329 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:29:43,290 WARN L227 SmtUtils]: Spent 5.26s on a formula simplification. DAG size of input: 327 DAG size of output: 252 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 02:30:22,572 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57432#(and (<= 0 ~t9_i~0) (<= 1 ~p_dw_i~0) (<= 1 ~q_free~0) (<= ~t7_i~0 0) (<= 0 ~t4_i~0) (<= 2 ~E_1~0) (<= 2 ~T2_E~0) (<= 0 ~t5_pc~0) (<= 0 ~t6_i~0) (<= ~t5_st~0 0) (<= 2 ~T6_E~0) (<= 0 |#NULL.base|) (<= ~T5_E~0 2) (<= 2 ~T4_E~0) (= ~t10_i~0 0) (<= 1 ~c_dr_i~0) (<= ~t9_i~0 0) (<= 0 ~t3_i~0) (<= 0 ~t5_st~0) (<= ~p_dw_pc~0 1) (<= ~T6_E~0 2) (<= 2 ~T10_E~0) (<= 0 ~t8_pc~0) (<= ~E_3~0 2) (<= ~t4_st~0 0) (<= 2 ~E_11~0) (<= 0 ~c_dr_pc~0) (<= 0 ~t1_i~0) (<= 0 ~p_dw_st~0) (<= 0 ~t6_st~0) (<= 0 ~local~0) (<= 2 ~E_M~0) (= ~T1_E~0 2) (<= 0 ~t2_pc~0) (<= ~c_dr_i~0 1) (<= 0 ~t11_pc~0) (<= ~t4_i~0 0) (<= ~T10_E~0 2) (<= 2 ~T3_E~0) (<= 0 ~p_dw_pc~0) (<= ~t2_st~0 0) (<= 1 ~q_req_up~0) (<= ~E_2~0 2) (<= 0 ~p_num_write~0) (<= 2 ~T11_E~0) (<= ~t11_st~0 0) (<= ~token~0 0) (<= ~c_dr_pc~0 1) (<= ~p_dw_st~0 2) (<= ~t6_pc~0 0) (<= 0 ~t7_st~0) (<= ~T7_E~0 2) (<= ~t11_pc~0 0) (<= ~t7_pc~0 0) (<= ~t1_pc~0 0) (<= ~T4_E~0 2) (<= ~t8_i~0 0) (<= 2 ~M_E~0) (<= ~T9_E~0 2) (<= |#NULL.offset| 0) (<= 0 ~t9_st~0) (<= 0 ~t10_st~0) (<= ~t5_i~0 0) (<= 2 ~E_2~0) (<= ~p_dw_i~0 1) (<= 2 ~T8_E~0) (<= ~T11_E~0 2) (<= 0 ~t11_st~0) (<= 1 ~c_dr_st~0) (<= 2 ~E_9~0) (<= ~local~0 0) (<= 2 ~E_6~0) (= ~m_i~0 0) (<= ~t2_i~0 0) (<= 2 ~E_8~0) (<= ~t8_st~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= ~T3_E~0 2) (<= ~E_4~0 2) (<= 2 ~E_7~0) (<= 2 ~E_3~0) (<= ~t10_pc~0 0) (<= ~t9_pc~0 0) (<= 0 ~t5_i~0) (<= 0 ~t8_st~0) (<= ~q_free~0 1) (<= ~t9_st~0 0) (<= ~q_req_up~0 1) (<= ~T8_E~0 2) (<= 0 ~t7_i~0) (<= ~E_6~0 2) (<= ~E_10~0 2) (<= 0 ~token~0) (<= 0 ~t2_i~0) (<= ~t3_st~0 0) (<= 0 ~t6_pc~0) (<= |#NULL.base| 0) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (<= ~t1_i~0 0) (<= 0 ~t10_pc~0) (<= ~T2_E~0 2) (<= 2 ~E_4~0) (<= 2 ~T7_E~0) (<= 2 ~E_10~0) (<= ~M_E~0 2) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (<= ~c_dr_st~0 1) (<= 2 ~T9_E~0) (<= ~t3_i~0 0) (<= 0 ~t2_st~0) (<= 0 ~t3_pc~0) (<= 0 ~t7_pc~0) (<= 0 ~t11_i~0) (<= ~t7_st~0 0) (<= ~E_8~0 2) (<= 0 ~t9_pc~0) (<= ~t5_pc~0 0) (<= 2 ~E_5~0) (<= ~t6_i~0 0) (<= 0 ~t8_i~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= ~E_1~0 2) (<= 0 |#NULL.offset|) (<= 2 ~T5_E~0) (<= ~t4_pc~0 0) (<= 0 ~t4_pc~0) (<= ~t2_pc~0 0) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (<= ~E_M~0 2) (<= ~E_11~0 2) (<= ~t11_i~0 0) (<= ~t6_st~0 0) (<= 0 ~t1_st~0) (<= ~E_7~0 2) (<= ~t8_pc~0 0) (<= ~t10_st~0 0) (<= ~E_9~0 2) (<= 0 ~t1_pc~0) (<= 0 ~t4_st~0))' at error location [2021-11-23 02:30:22,572 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:30:22,572 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:30:22,573 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 16] total 49 [2021-11-23 02:30:22,573 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213809241] [2021-11-23 02:30:22,573 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:30:22,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 02:30:22,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:22,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 02:30:22,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=755, Invalid=9957, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 02:30:22,578 INFO L87 Difference]: Start difference. First operand 1632 states and 2228 transitions. Second operand has 49 states, 32 states have (on average 6.09375) internal successors, (195), 37 states have internal predecessors, (195), 17 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 17 states have call predecessors, (46), 17 states have call successors, (46) [2021-11-23 02:30:39,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:39,577 INFO L93 Difference]: Finished difference Result 4248 states and 5401 transitions. [2021-11-23 02:30:39,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2021-11-23 02:30:39,579 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 32 states have (on average 6.09375) internal successors, (195), 37 states have internal predecessors, (195), 17 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 17 states have call predecessors, (46), 17 states have call successors, (46) Word has length 114 [2021-11-23 02:30:39,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:39,602 INFO L225 Difference]: With dead ends: 4248 [2021-11-23 02:30:39,602 INFO L226 Difference]: Without dead ends: 3533 [2021-11-23 02:30:39,626 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 284 SyntacticMatches, 8 SemanticMatches, 324 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44163 ImplicationChecksByTransitivity, 106.9s TimeCoverageRelationStatistics Valid=9438, Invalid=96512, Unknown=0, NotChecked=0, Total=105950 [2021-11-23 02:30:39,627 INFO L933 BasicCegarLoop]: 387 mSDtfsCounter, 5567 mSDsluCounter, 4367 mSDsCounter, 0 mSdLazyCounter, 7672 mSolverCounterSat, 3098 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5573 SdHoareTripleChecker+Valid, 4176 SdHoareTripleChecker+Invalid, 10770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3098 IncrementalHoareTripleChecker+Valid, 7672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:39,627 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5573 Valid, 4176 Invalid, 10770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3098 Valid, 7672 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2021-11-23 02:30:39,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3533 states. [2021-11-23 02:30:39,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3533 to 1908. [2021-11-23 02:30:39,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1908 states, 1435 states have (on average 1.326829268292683) internal successors, (1904), 1450 states have internal predecessors, (1904), 279 states have call successors, (279), 178 states have call predecessors, (279), 192 states have return successors, (358), 281 states have call predecessors, (358), 276 states have call successors, (358) [2021-11-23 02:30:39,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1908 states to 1908 states and 2541 transitions. [2021-11-23 02:30:39,869 INFO L78 Accepts]: Start accepts. Automaton has 1908 states and 2541 transitions. Word has length 114 [2021-11-23 02:30:39,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:39,870 INFO L470 AbstractCegarLoop]: Abstraction has 1908 states and 2541 transitions. [2021-11-23 02:30:39,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 32 states have (on average 6.09375) internal successors, (195), 37 states have internal predecessors, (195), 17 states have call successors, (44), 14 states have call predecessors, (44), 22 states have return successors, (46), 17 states have call predecessors, (46), 17 states have call successors, (46) [2021-11-23 02:30:39,870 INFO L276 IsEmpty]: Start isEmpty. Operand 1908 states and 2541 transitions. [2021-11-23 02:30:39,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-23 02:30:39,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:39,874 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:39,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:40,087 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:30:40,087 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:40,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:40,088 INFO L85 PathProgramCache]: Analyzing trace with hash -1276584700, now seen corresponding path program 1 times [2021-11-23 02:30:40,088 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:40,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845106878] [2021-11-23 02:30:40,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:40,088 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:40,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:40,267 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 23 proven. 11 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:30:40,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:40,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845106878] [2021-11-23 02:30:40,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845106878] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:40,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757116910] [2021-11-23 02:30:40,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:40,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:40,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:40,270 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:40,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:30:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:40,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:30:40,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:40,596 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:30:40,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:40,911 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:30:40,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757116910] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:40,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:30:40,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14, 8] total 20 [2021-11-23 02:30:40,912 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239961835] [2021-11-23 02:30:40,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:30:40,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:30:40,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:30:40,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:30:40,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:30:40,914 INFO L87 Difference]: Start difference. First operand 1908 states and 2541 transitions. Second operand has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:30:41,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:30:41,676 INFO L93 Difference]: Finished difference Result 3232 states and 4089 transitions. [2021-11-23 02:30:41,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:30:41,677 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 115 [2021-11-23 02:30:41,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:30:41,692 INFO L225 Difference]: With dead ends: 3232 [2021-11-23 02:30:41,692 INFO L226 Difference]: Without dead ends: 2241 [2021-11-23 02:30:41,695 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=552, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:30:41,696 INFO L933 BasicCegarLoop]: 331 mSDtfsCounter, 493 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 916 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 497 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 1024 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:30:41,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [497 Valid, 809 Invalid, 1024 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 916 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:30:41,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2241 states. [2021-11-23 02:30:41,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2241 to 1988. [2021-11-23 02:30:41,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1988 states, 1480 states have (on average 1.320945945945946) internal successors, (1955), 1498 states have internal predecessors, (1955), 298 states have call successors, (298), 187 states have call predecessors, (298), 208 states have return successors, (398), 304 states have call predecessors, (398), 295 states have call successors, (398) [2021-11-23 02:30:41,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1988 states to 1988 states and 2651 transitions. [2021-11-23 02:30:41,987 INFO L78 Accepts]: Start accepts. Automaton has 1988 states and 2651 transitions. Word has length 115 [2021-11-23 02:30:41,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:30:41,989 INFO L470 AbstractCegarLoop]: Abstraction has 1988 states and 2651 transitions. [2021-11-23 02:30:41,990 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 11.5) internal successors, (69), 6 states have internal predecessors, (69), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:30:41,990 INFO L276 IsEmpty]: Start isEmpty. Operand 1988 states and 2651 transitions. [2021-11-23 02:30:41,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-23 02:30:41,993 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:30:41,993 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:30:42,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:30:42,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:42,207 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:30:42,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:30:42,208 INFO L85 PathProgramCache]: Analyzing trace with hash 2025099160, now seen corresponding path program 1 times [2021-11-23 02:30:42,208 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:30:42,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518662583] [2021-11-23 02:30:42,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:42,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:30:42,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:42,492 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 30 proven. 24 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:30:42,492 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:30:42,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518662583] [2021-11-23 02:30:42,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518662583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:30:42,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360097641] [2021-11-23 02:30:42,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:30:42,493 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:30:42,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:30:42,494 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:30:42,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:30:42,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:30:42,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-23 02:30:42,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:30:43,686 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 60 proven. 23 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 02:30:43,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:30:45,381 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 13 proven. 44 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:30:45,382 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360097641] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:45,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1515080244] [2021-11-23 02:30:45,385 INFO L159 IcfgInterpreter]: Started Sifa with 69 locations of interest [2021-11-23 02:30:45,385 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:45,386 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:45,386 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:45,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:31:07,364 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 352 for LOIs [2021-11-23 02:31:08,429 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 302 for LOIs [2021-11-23 02:31:08,539 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 299 for LOIs [2021-11-23 02:31:08,660 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 364 for LOIs [2021-11-23 02:31:11,691 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 202 for LOIs [2021-11-23 02:31:12,109 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 150 for LOIs [2021-11-23 02:31:12,490 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 356 for LOIs [2021-11-23 02:31:13,307 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 379 for LOIs [2021-11-23 02:31:14,015 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:32:50,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75936#(and (= ~q_req_up~0 1) (<= 0 ~p_dw_pc~0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (<= ~t7_pc~0 0) (<= ~t1_pc~0 0) (<= ~t8_i~0 0) (<= 2 ~M_E~0) (<= ~T9_E~0 2) (<= |#NULL.offset| 0) (<= 0 ~t9_st~0) (= ~c_dr_pc~0 1) (<= 0 ~t10_st~0) (<= ~t5_i~0 0) (<= 2 ~T8_E~0) (<= 2 ~E_9~0) (<= 2 ~E_6~0) (<= ~t2_i~0 0) (<= 2 ~E_8~0) (<= ~t8_st~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (<= ~E_4~0 2) (<= 2 ~E_7~0) (<= ~t10_pc~0 0) (<= ~t9_pc~0 0) (<= 0 ~t5_i~0) (<= 0 ~t8_st~0) (<= ~t9_st~0 0) (<= ~T8_E~0 2) (<= ~E_6~0 2) (<= ~E_10~0 2) (<= 0 ~t2_i~0) (= ~c_last_read~0 ~q_buf_0~0) (<= ~t3_st~0 0) (<= ~c_num_read~0 1) (<= 0 ~t3_st~0) (<= ~m_pc~0 0) (<= 0 ~t10_pc~0) (or (and (= ~T6_E~0 2) (= ~t6_i~0 0) (= 0 ~t5_pc~0) (= ~T11_E~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= 0 ~t8_pc~0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t4_i~0 0) (= ~E_11~0 2) (= ~T7_E~0 2) (= ~m_i~0 0) (= ~t11_pc~0 0) (= ~p_dw_pc~0 1) (= ~E_2~0 2) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~token~0 0) (= 2 ~p_dw_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= ~t11_st~0 0) (= ~E_1~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0)) (and (= ~T6_E~0 2) (= ~t6_i~0 0) (= 0 ~t5_pc~0) (= ~T11_E~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= 0 ~t8_pc~0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t4_i~0 0) (= ~E_11~0 2) (= ~T7_E~0 2) (= ~m_i~0 0) (= ~t11_pc~0 0) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~token~0 0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= ~t11_st~0 0) (= ~E_1~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))) (<= 2 ~E_4~0) (<= 2 ~E_10~0) (<= ~M_E~0 2) (<= ~E_5~0 2) (<= ~m_st~0 0) (<= ~t3_pc~0 0) (= ~c_last_read~0 ~p_last_write~0) (<= 0 ~m_pc~0) (<= 2 ~T9_E~0) (<= 0 ~t3_pc~0) (<= 0 ~t7_pc~0) (<= 0 ~t11_i~0) (<= ~E_8~0 2) (<= 0 ~t9_pc~0) (<= 2 ~E_5~0) (<= 0 ~t8_i~0) (<= 1 ~c_num_read~0) (<= 0 ~m_st~0) (<= 0 |#NULL.offset|) (<= ~t4_pc~0 0) (<= 0 ~t4_pc~0) (<= ~t1_st~0 0) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (<= ~t11_i~0 0) (<= 0 ~t1_st~0) (<= ~E_7~0 2) (<= ~t10_st~0 0) (<= ~E_9~0 2) (<= 0 ~t1_pc~0))' at error location [2021-11-23 02:32:50,697 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:32:50,698 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:32:50,698 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 51 [2021-11-23 02:32:50,698 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020226150] [2021-11-23 02:32:50,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:32:50,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 02:32:50,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:32:50,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 02:32:50,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=934, Invalid=10622, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 02:32:50,702 INFO L87 Difference]: Start difference. First operand 1988 states and 2651 transitions. Second operand has 51 states, 34 states have (on average 6.264705882352941) internal successors, (213), 39 states have internal predecessors, (213), 24 states have call successors, (49), 15 states have call predecessors, (49), 21 states have return successors, (51), 23 states have call predecessors, (51), 24 states have call successors, (51) [2021-11-23 02:33:01,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:01,289 INFO L93 Difference]: Finished difference Result 4193 states and 5230 transitions. [2021-11-23 02:33:01,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-23 02:33:01,289 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 34 states have (on average 6.264705882352941) internal successors, (213), 39 states have internal predecessors, (213), 24 states have call successors, (49), 15 states have call predecessors, (49), 21 states have return successors, (51), 23 states have call predecessors, (51), 24 states have call successors, (51) Word has length 124 [2021-11-23 02:33:01,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:01,308 INFO L225 Difference]: With dead ends: 4193 [2021-11-23 02:33:01,308 INFO L226 Difference]: Without dead ends: 3122 [2021-11-23 02:33:01,317 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 314 SyntacticMatches, 7 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17219 ImplicationChecksByTransitivity, 102.6s TimeCoverageRelationStatistics Valid=4222, Invalid=38420, Unknown=0, NotChecked=0, Total=42642 [2021-11-23 02:33:01,318 INFO L933 BasicCegarLoop]: 369 mSDtfsCounter, 6920 mSDsluCounter, 3113 mSDsCounter, 0 mSdLazyCounter, 7760 mSolverCounterSat, 4132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6920 SdHoareTripleChecker+Valid, 2985 SdHoareTripleChecker+Invalid, 11892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4132 IncrementalHoareTripleChecker+Valid, 7760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:01,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6920 Valid, 2985 Invalid, 11892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4132 Valid, 7760 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2021-11-23 02:33:01,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3122 states. [2021-11-23 02:33:01,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3122 to 1804. [2021-11-23 02:33:01,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1804 states, 1368 states have (on average 1.3355263157894737) internal successors, (1827), 1385 states have internal predecessors, (1827), 258 states have call successors, (258), 155 states have call predecessors, (258), 176 states have return successors, (348), 265 states have call predecessors, (348), 255 states have call successors, (348) [2021-11-23 02:33:01,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1804 states to 1804 states and 2433 transitions. [2021-11-23 02:33:01,532 INFO L78 Accepts]: Start accepts. Automaton has 1804 states and 2433 transitions. Word has length 124 [2021-11-23 02:33:01,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:01,533 INFO L470 AbstractCegarLoop]: Abstraction has 1804 states and 2433 transitions. [2021-11-23 02:33:01,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 34 states have (on average 6.264705882352941) internal successors, (213), 39 states have internal predecessors, (213), 24 states have call successors, (49), 15 states have call predecessors, (49), 21 states have return successors, (51), 23 states have call predecessors, (51), 24 states have call successors, (51) [2021-11-23 02:33:01,534 INFO L276 IsEmpty]: Start isEmpty. Operand 1804 states and 2433 transitions. [2021-11-23 02:33:01,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-23 02:33:01,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:01,546 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:01,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:01,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:33:01,760 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:01,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:01,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1822746402, now seen corresponding path program 1 times [2021-11-23 02:33:01,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:01,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807346606] [2021-11-23 02:33:01,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:01,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:01,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:01,841 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 38 proven. 9 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:33:01,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:01,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807346606] [2021-11-23 02:33:01,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807346606] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:01,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213600362] [2021-11-23 02:33:01,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:01,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:01,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:01,844 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:01,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:33:02,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:02,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 02:33:02,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:02,199 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 50 proven. 17 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 02:33:02,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:33:02,482 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:33:02,482 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213600362] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:02,482 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:33:02,482 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9, 10] total 17 [2021-11-23 02:33:02,482 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220197249] [2021-11-23 02:33:02,482 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:02,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:33:02,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:02,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:33:02,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:33:02,484 INFO L87 Difference]: Start difference. First operand 1804 states and 2433 transitions. Second operand has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:33:03,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:03,339 INFO L93 Difference]: Finished difference Result 2459 states and 3174 transitions. [2021-11-23 02:33:03,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:33:03,340 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 125 [2021-11-23 02:33:03,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:03,351 INFO L225 Difference]: With dead ends: 2459 [2021-11-23 02:33:03,351 INFO L226 Difference]: Without dead ends: 1572 [2021-11-23 02:33:03,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:33:03,355 INFO L933 BasicCegarLoop]: 322 mSDtfsCounter, 764 mSDsluCounter, 697 mSDsCounter, 0 mSdLazyCounter, 1007 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 894 SdHoareTripleChecker+Invalid, 1189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 1007 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:03,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 894 Invalid, 1189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 1007 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:33:03,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1572 states. [2021-11-23 02:33:03,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1572 to 1535. [2021-11-23 02:33:03,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1535 states, 1169 states have (on average 1.3532934131736527) internal successors, (1582), 1186 states have internal predecessors, (1582), 222 states have call successors, (222), 125 states have call predecessors, (222), 142 states have return successors, (307), 225 states have call predecessors, (307), 219 states have call successors, (307) [2021-11-23 02:33:03,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1535 states to 1535 states and 2111 transitions. [2021-11-23 02:33:03,547 INFO L78 Accepts]: Start accepts. Automaton has 1535 states and 2111 transitions. Word has length 125 [2021-11-23 02:33:03,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:03,548 INFO L470 AbstractCegarLoop]: Abstraction has 1535 states and 2111 transitions. [2021-11-23 02:33:03,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.428571428571429) internal successors, (73), 7 states have internal predecessors, (73), 4 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-23 02:33:03,548 INFO L276 IsEmpty]: Start isEmpty. Operand 1535 states and 2111 transitions. [2021-11-23 02:33:03,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:03,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:03,553 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:03,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:03,769 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:03,770 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:03,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:03,770 INFO L85 PathProgramCache]: Analyzing trace with hash -754662820, now seen corresponding path program 1 times [2021-11-23 02:33:03,770 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:03,770 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393760194] [2021-11-23 02:33:03,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:03,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:03,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:03,852 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:33:03,852 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:03,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393760194] [2021-11-23 02:33:03,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [393760194] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:03,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173246358] [2021-11-23 02:33:03,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:03,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:03,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:03,854 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:03,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:33:04,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:04,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 991 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:33:04,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:04,184 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:33:04,184 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:04,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173246358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:04,185 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:04,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:33:04,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422428343] [2021-11-23 02:33:04,185 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:04,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:04,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:04,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:04,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:04,186 INFO L87 Difference]: Start difference. First operand 1535 states and 2111 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:04,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:04,462 INFO L93 Difference]: Finished difference Result 3159 states and 4826 transitions. [2021-11-23 02:33:04,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:04,463 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 02:33:04,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:04,476 INFO L225 Difference]: With dead ends: 3159 [2021-11-23 02:33:04,476 INFO L226 Difference]: Without dead ends: 2339 [2021-11-23 02:33:04,482 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:04,483 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 335 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:04,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [335 Valid, 538 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:04,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2339 states. [2021-11-23 02:33:04,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2339 to 2330. [2021-11-23 02:33:04,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2330 states, 1837 states have (on average 1.4137180185084377) internal successors, (2597), 1857 states have internal predecessors, (2597), 319 states have call successors, (319), 155 states have call predecessors, (319), 172 states have return successors, (458), 319 states have call predecessors, (458), 316 states have call successors, (458) [2021-11-23 02:33:04,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2330 states to 2330 states and 3374 transitions. [2021-11-23 02:33:04,748 INFO L78 Accepts]: Start accepts. Automaton has 2330 states and 3374 transitions. Word has length 130 [2021-11-23 02:33:04,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:04,749 INFO L470 AbstractCegarLoop]: Abstraction has 2330 states and 3374 transitions. [2021-11-23 02:33:04,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:04,749 INFO L276 IsEmpty]: Start isEmpty. Operand 2330 states and 3374 transitions. [2021-11-23 02:33:04,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:04,756 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:04,756 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:04,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:04,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:04,983 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:04,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:04,984 INFO L85 PathProgramCache]: Analyzing trace with hash -584975270, now seen corresponding path program 1 times [2021-11-23 02:33:04,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:04,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894128561] [2021-11-23 02:33:04,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:04,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:05,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:05,046 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:33:05,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:05,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894128561] [2021-11-23 02:33:05,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894128561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:05,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13888212] [2021-11-23 02:33:05,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:05,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:05,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:05,064 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:05,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:33:05,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:05,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 985 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:33:05,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:05,465 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 02:33:05,465 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:05,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13888212] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:05,466 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:05,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:33:05,466 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684247994] [2021-11-23 02:33:05,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:05,466 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:05,467 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:05,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:05,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:05,467 INFO L87 Difference]: Start difference. First operand 2330 states and 3374 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:05,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:05,915 INFO L93 Difference]: Finished difference Result 5529 states and 8698 transitions. [2021-11-23 02:33:05,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:05,916 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 02:33:05,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:05,932 INFO L225 Difference]: With dead ends: 5529 [2021-11-23 02:33:05,932 INFO L226 Difference]: Without dead ends: 3914 [2021-11-23 02:33:05,943 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:05,944 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 332 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:05,945 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 538 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:05,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3914 states. [2021-11-23 02:33:06,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3914 to 3900. [2021-11-23 02:33:06,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3900 states, 3158 states have (on average 1.4556681443951869) internal successors, (4597), 3184 states have internal predecessors, (4597), 508 states have call successors, (508), 215 states have call predecessors, (508), 232 states have return successors, (751), 502 states have call predecessors, (751), 505 states have call successors, (751) [2021-11-23 02:33:06,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3900 states to 3900 states and 5856 transitions. [2021-11-23 02:33:06,315 INFO L78 Accepts]: Start accepts. Automaton has 3900 states and 5856 transitions. Word has length 130 [2021-11-23 02:33:06,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:06,315 INFO L470 AbstractCegarLoop]: Abstraction has 3900 states and 5856 transitions. [2021-11-23 02:33:06,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 2 states have internal predecessors, (84), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:06,315 INFO L276 IsEmpty]: Start isEmpty. Operand 3900 states and 5856 transitions. [2021-11-23 02:33:06,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:06,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:06,325 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:06,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:06,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:06,540 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:06,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:06,540 INFO L85 PathProgramCache]: Analyzing trace with hash 512307996, now seen corresponding path program 1 times [2021-11-23 02:33:06,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:06,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003959168] [2021-11-23 02:33:06,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:06,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:06,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:06,606 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:33:06,606 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:06,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003959168] [2021-11-23 02:33:06,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003959168] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:06,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269733549] [2021-11-23 02:33:06,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:06,607 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:06,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:06,608 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:06,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:33:06,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:06,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 979 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:33:06,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:07,026 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:33:07,026 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:07,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269733549] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:07,027 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:07,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:33:07,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455714389] [2021-11-23 02:33:07,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:07,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:07,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:07,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:07,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:07,028 INFO L87 Difference]: Start difference. First operand 3900 states and 5856 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:07,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:07,645 INFO L93 Difference]: Finished difference Result 10209 states and 16301 transitions. [2021-11-23 02:33:07,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:07,645 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 02:33:07,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:07,671 INFO L225 Difference]: With dead ends: 10209 [2021-11-23 02:33:07,671 INFO L226 Difference]: Without dead ends: 7024 [2021-11-23 02:33:07,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:07,688 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 314 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:07,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [314 Valid, 538 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:07,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7024 states. [2021-11-23 02:33:08,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7024 to 7000. [2021-11-23 02:33:08,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7000 states, 5770 states have (on average 1.4795493934142114) internal successors, (8537), 5808 states have internal predecessors, (8537), 876 states have call successors, (876), 335 states have call predecessors, (876), 352 states have return successors, (1319), 858 states have call predecessors, (1319), 873 states have call successors, (1319) [2021-11-23 02:33:08,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7000 states to 7000 states and 10732 transitions. [2021-11-23 02:33:08,332 INFO L78 Accepts]: Start accepts. Automaton has 7000 states and 10732 transitions. Word has length 130 [2021-11-23 02:33:08,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:08,332 INFO L470 AbstractCegarLoop]: Abstraction has 7000 states and 10732 transitions. [2021-11-23 02:33:08,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 2 states have internal predecessors, (102), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:08,333 INFO L276 IsEmpty]: Start isEmpty. Operand 7000 states and 10732 transitions. [2021-11-23 02:33:08,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:08,347 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:08,347 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:08,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:08,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 02:33:08,563 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:08,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:08,564 INFO L85 PathProgramCache]: Analyzing trace with hash 177075806, now seen corresponding path program 1 times [2021-11-23 02:33:08,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:08,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003531472] [2021-11-23 02:33:08,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:08,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:08,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:08,643 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:33:08,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:08,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003531472] [2021-11-23 02:33:08,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003531472] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:08,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440385170] [2021-11-23 02:33:08,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:08,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:08,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:08,645 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:08,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:33:08,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:08,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 973 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:33:08,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:09,049 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:33:09,050 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:09,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1440385170] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:09,050 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:09,050 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:33:09,050 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690324371] [2021-11-23 02:33:09,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:09,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:09,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:09,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:09,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:09,054 INFO L87 Difference]: Start difference. First operand 7000 states and 10732 transitions. Second operand has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:10,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:10,136 INFO L93 Difference]: Finished difference Result 19449 states and 31225 transitions. [2021-11-23 02:33:10,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:10,137 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 02:33:10,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:10,196 INFO L225 Difference]: With dead ends: 19449 [2021-11-23 02:33:10,196 INFO L226 Difference]: Without dead ends: 13164 [2021-11-23 02:33:10,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:10,233 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 320 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 320 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:10,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [320 Valid, 538 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:10,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13164 states. [2021-11-23 02:33:11,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13164 to 13120. [2021-11-23 02:33:11,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13120 states, 10934 states have (on average 1.490488384854582) internal successors, (16297), 10996 states have internal predecessors, (16297), 1592 states have call successors, (1592), 575 states have call predecessors, (1592), 592 states have return successors, (2419), 1550 states have call predecessors, (2419), 1589 states have call successors, (2419) [2021-11-23 02:33:11,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13120 states to 13120 states and 20308 transitions. [2021-11-23 02:33:11,325 INFO L78 Accepts]: Start accepts. Automaton has 13120 states and 20308 transitions. Word has length 130 [2021-11-23 02:33:11,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:11,325 INFO L470 AbstractCegarLoop]: Abstraction has 13120 states and 20308 transitions. [2021-11-23 02:33:11,325 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.0) internal successors, (96), 2 states have internal predecessors, (96), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:11,325 INFO L276 IsEmpty]: Start isEmpty. Operand 13120 states and 20308 transitions. [2021-11-23 02:33:11,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:11,348 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:11,348 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:11,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:11,575 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:11,575 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:11,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:11,576 INFO L85 PathProgramCache]: Analyzing trace with hash -435175392, now seen corresponding path program 1 times [2021-11-23 02:33:11,576 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:11,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803697993] [2021-11-23 02:33:11,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:11,576 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:11,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:11,643 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:33:11,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:11,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803697993] [2021-11-23 02:33:11,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803697993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:11,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938559334] [2021-11-23 02:33:11,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:11,644 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:11,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:11,645 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:11,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:33:11,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:11,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 967 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:33:11,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:12,023 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 02:33:12,023 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:12,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938559334] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:12,023 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:12,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:33:12,024 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711627092] [2021-11-23 02:33:12,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:12,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:12,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:12,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:12,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:12,025 INFO L87 Difference]: Start difference. First operand 13120 states and 20308 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:13,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:13,711 INFO L93 Difference]: Finished difference Result 37689 states and 60509 transitions. [2021-11-23 02:33:13,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:13,712 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 02:33:13,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:13,829 INFO L225 Difference]: With dead ends: 37689 [2021-11-23 02:33:13,830 INFO L226 Difference]: Without dead ends: 25284 [2021-11-23 02:33:13,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:13,881 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 326 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:13,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 538 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:13,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25284 states. [2021-11-23 02:33:15,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25284 to 25200. [2021-11-23 02:33:15,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25200 states, 21142 states have (on average 1.4935673067827073) internal successors, (31577), 21252 states have internal predecessors, (31577), 2984 states have call successors, (2984), 1055 states have call predecessors, (2984), 1072 states have return successors, (4547), 2894 states have call predecessors, (4547), 2981 states have call successors, (4547) [2021-11-23 02:33:16,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25200 states to 25200 states and 39108 transitions. [2021-11-23 02:33:16,059 INFO L78 Accepts]: Start accepts. Automaton has 25200 states and 39108 transitions. Word has length 130 [2021-11-23 02:33:16,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:16,059 INFO L470 AbstractCegarLoop]: Abstraction has 25200 states and 39108 transitions. [2021-11-23 02:33:16,059 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 2 states have internal predecessors, (90), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:16,059 INFO L276 IsEmpty]: Start isEmpty. Operand 25200 states and 39108 transitions. [2021-11-23 02:33:16,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:16,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:16,105 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:16,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:33:16,319 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 02:33:16,319 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:16,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:16,320 INFO L85 PathProgramCache]: Analyzing trace with hash 936357986, now seen corresponding path program 1 times [2021-11-23 02:33:16,320 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:16,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063387058] [2021-11-23 02:33:16,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:16,320 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:16,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:16,389 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:33:16,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:16,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063387058] [2021-11-23 02:33:16,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063387058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:33:16,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445962147] [2021-11-23 02:33:16,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:16,390 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:33:16,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:33:16,391 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:33:16,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:33:16,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:16,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:33:16,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:33:16,773 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:33:16,773 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:33:16,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445962147] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:16,773 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:33:16,773 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:33:16,773 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122968700] [2021-11-23 02:33:16,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:16,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:33:16,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:16,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:33:16,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:16,774 INFO L87 Difference]: Start difference. First operand 25200 states and 39108 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:19,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:19,957 INFO L93 Difference]: Finished difference Result 73689 states and 117949 transitions. [2021-11-23 02:33:19,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:33:19,958 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 130 [2021-11-23 02:33:19,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:20,208 INFO L225 Difference]: With dead ends: 73689 [2021-11-23 02:33:20,208 INFO L226 Difference]: Without dead ends: 49204 [2021-11-23 02:33:20,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:20,480 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 311 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 311 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:20,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [311 Valid, 538 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:33:20,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49204 states. [2021-11-23 02:33:24,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49204 to 49040. [2021-11-23 02:33:24,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49040 states, 41318 states have (on average 1.4922551914419866) internal successors, (61657), 41524 states have internal predecessors, (61657), 5688 states have call successors, (5688), 2015 states have call predecessors, (5688), 2032 states have return successors, (8659), 5502 states have call predecessors, (8659), 5685 states have call successors, (8659) [2021-11-23 02:33:24,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49040 states to 49040 states and 76004 transitions. [2021-11-23 02:33:24,779 INFO L78 Accepts]: Start accepts. Automaton has 49040 states and 76004 transitions. Word has length 130 [2021-11-23 02:33:24,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:24,780 INFO L470 AbstractCegarLoop]: Abstraction has 49040 states and 76004 transitions. [2021-11-23 02:33:24,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:33:24,780 INFO L276 IsEmpty]: Start isEmpty. Operand 49040 states and 76004 transitions. [2021-11-23 02:33:24,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:33:24,842 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:24,842 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:24,878 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-23 02:33:25,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2ff5af2a-45ee-4a1c-ad79-27fa06fbaf41/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:33:25,055 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:25,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:25,056 INFO L85 PathProgramCache]: Analyzing trace with hash -1517714336, now seen corresponding path program 1 times [2021-11-23 02:33:25,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:25,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37089449] [2021-11-23 02:33:25,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:25,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:25,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:25,165 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:33:25,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:25,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37089449] [2021-11-23 02:33:25,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37089449] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:25,166 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:25,166 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:33:25,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067155510] [2021-11-23 02:33:25,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:25,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:33:25,167 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:25,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:33:25,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:25,168 INFO L87 Difference]: Start difference. First operand 49040 states and 76004 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:33:31,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:33:31,869 INFO L93 Difference]: Finished difference Result 130168 states and 204090 transitions. [2021-11-23 02:33:31,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:33:31,870 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 130 [2021-11-23 02:33:31,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:33:32,270 INFO L225 Difference]: With dead ends: 130168 [2021-11-23 02:33:32,270 INFO L226 Difference]: Without dead ends: 81844 [2021-11-23 02:33:32,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:33:32,440 INFO L933 BasicCegarLoop]: 306 mSDtfsCounter, 947 mSDsluCounter, 887 mSDsCounter, 0 mSdLazyCounter, 505 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 963 SdHoareTripleChecker+Valid, 1053 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 505 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:33:32,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [963 Valid, 1053 Invalid, 676 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 505 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:33:32,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81844 states. [2021-11-23 02:33:38,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81844 to 72560. [2021-11-23 02:33:38,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72560 states, 61174 states have (on average 1.4891457155000491) internal successors, (91097), 61476 states have internal predecessors, (91097), 8392 states have call successors, (8392), 2975 states have call predecessors, (8392), 2992 states have return successors, (12771), 8110 states have call predecessors, (12771), 8389 states have call successors, (12771) [2021-11-23 02:33:38,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72560 states to 72560 states and 112260 transitions. [2021-11-23 02:33:38,898 INFO L78 Accepts]: Start accepts. Automaton has 72560 states and 112260 transitions. Word has length 130 [2021-11-23 02:33:38,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:33:38,898 INFO L470 AbstractCegarLoop]: Abstraction has 72560 states and 112260 transitions. [2021-11-23 02:33:38,899 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:33:38,899 INFO L276 IsEmpty]: Start isEmpty. Operand 72560 states and 112260 transitions. [2021-11-23 02:33:38,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:33:38,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:33:38,948 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:33:38,948 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-23 02:33:38,948 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:33:38,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:33:38,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1510728182, now seen corresponding path program 1 times [2021-11-23 02:33:38,949 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:33:38,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093645395] [2021-11-23 02:33:38,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:33:38,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:33:38,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:33:39,047 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:33:39,047 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:33:39,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093645395] [2021-11-23 02:33:39,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093645395] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:33:39,047 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:33:39,048 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:33:39,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336252811] [2021-11-23 02:33:39,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:33:39,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:33:39,049 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:33:39,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:33:39,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:33:39,049 INFO L87 Difference]: Start difference. First operand 72560 states and 112260 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)