./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW --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 5fa3500dbb7b48d33bda6025d194df10b5d868e3a16ab8452fef68790ebc5c6f --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 13:48:40,506 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 13:48:40,509 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 13:48:40,547 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 13:48:40,547 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 13:48:40,548 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 13:48:40,549 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 13:48:40,551 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 13:48:40,552 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 13:48:40,553 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 13:48:40,554 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 13:48:40,555 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 13:48:40,556 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 13:48:40,557 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 13:48:40,558 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 13:48:40,559 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 13:48:40,560 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 13:48:40,561 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 13:48:40,563 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 13:48:40,566 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 13:48:40,567 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 13:48:40,578 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 13:48:40,579 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 13:48:40,580 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 13:48:40,585 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 13:48:40,590 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 13:48:40,591 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 13:48:40,592 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 13:48:40,592 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 13:48:40,593 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 13:48:40,596 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 13:48:40,597 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 13:48:40,598 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 13:48:40,599 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 13:48:40,601 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 13:48:40,601 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 13:48:40,602 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 13:48:40,602 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 13:48:40,603 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 13:48:40,604 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 13:48:40,604 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 13:48:40,606 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-23 13:48:40,647 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 13:48:40,647 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 13:48:40,648 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 13:48:40,648 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 13:48:40,649 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 13:48:40,649 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 13:48:40,649 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 13:48:40,649 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 13:48:40,649 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 13:48:40,650 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 13:48:40,651 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 13:48:40,651 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 13:48:40,651 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 13:48:40,651 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 13:48:40,652 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 13:48:40,652 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 13:48:40,652 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 13:48:40,652 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 13:48:40,653 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 13:48:40,653 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 13:48:40,654 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 13:48:40,654 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 13:48:40,654 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 13:48:40,654 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 13:48:40,654 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 13:48:40,655 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 13:48:40,655 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 13:48:40,656 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 13:48:40,656 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 13:48:40,656 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 13:48:40,656 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 13:48:40,656 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 13:48:40,657 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:48:40,657 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 13:48:40,657 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 13:48:40,657 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 13:48:40,658 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 13:48:40,658 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 13:48:40,658 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 13:48:40,658 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 13:48:40,658 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 13:48:40,659 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5fa3500dbb7b48d33bda6025d194df10b5d868e3a16ab8452fef68790ebc5c6f [2022-11-23 13:48:40,925 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 13:48:40,949 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 13:48:40,952 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 13:48:40,953 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 13:48:40,953 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 13:48:40,955 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c [2022-11-23 13:48:44,041 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 13:48:44,301 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 13:48:44,310 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c [2022-11-23 13:48:44,333 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/data/bb2fe4052/4022b0d960fd4de8b82149ab3418a165/FLAG1fdfbb924 [2022-11-23 13:48:44,347 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/data/bb2fe4052/4022b0d960fd4de8b82149ab3418a165 [2022-11-23 13:48:44,349 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 13:48:44,351 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 13:48:44,352 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 13:48:44,353 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 13:48:44,356 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 13:48:44,357 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,358 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c6fff0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44, skipping insertion in model container [2022-11-23 13:48:44,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,366 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 13:48:44,413 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 13:48:44,570 WARN L237 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_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[911,924] [2022-11-23 13:48:44,637 WARN L237 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_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[8416,8429] [2022-11-23 13:48:44,764 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:48:44,776 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 13:48:44,788 WARN L237 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_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[911,924] [2022-11-23 13:48:44,808 WARN L237 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_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.10.cil-1.c[8416,8429] [2022-11-23 13:48:44,858 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 13:48:44,889 INFO L208 MainTranslator]: Completed translation [2022-11-23 13:48:44,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44 WrapperNode [2022-11-23 13:48:44,890 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 13:48:44,893 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 13:48:44,894 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 13:48:44,894 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 13:48:44,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,916 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,965 INFO L138 Inliner]: procedures = 75, calls = 92, calls flagged for inlining = 43, calls inlined = 43, statements flattened = 967 [2022-11-23 13:48:44,965 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 13:48:44,966 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 13:48:44,966 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 13:48:44,966 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 13:48:44,977 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,978 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,983 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,983 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:44,996 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:45,026 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:45,030 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:45,033 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:45,047 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 13:48:45,048 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 13:48:45,048 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 13:48:45,048 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 13:48:45,049 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (1/1) ... [2022-11-23 13:48:45,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 13:48:45,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:48:45,101 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 13:48:45,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 13:48:45,143 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 13:48:45,143 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-23 13:48:45,143 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-23 13:48:45,144 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-11-23 13:48:45,144 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-11-23 13:48:45,144 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-23 13:48:45,144 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-23 13:48:45,144 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-23 13:48:45,144 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-23 13:48:45,144 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-11-23 13:48:45,145 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-11-23 13:48:45,145 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-23 13:48:45,145 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-23 13:48:45,145 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-23 13:48:45,145 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-23 13:48:45,145 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-11-23 13:48:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-11-23 13:48:45,146 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-11-23 13:48:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-11-23 13:48:45,146 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-11-23 13:48:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-11-23 13:48:45,146 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-23 13:48:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-23 13:48:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 13:48:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-23 13:48:45,147 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-23 13:48:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-11-23 13:48:45,147 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-11-23 13:48:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 13:48:45,147 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 13:48:45,148 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-23 13:48:45,148 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-23 13:48:45,148 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-23 13:48:45,148 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-23 13:48:45,282 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 13:48:45,291 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 13:48:46,249 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2022-11-23 13:48:46,250 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##55: assume 1 == ~q_free~0;~c_dr_st~0 := 2;~c_dr_pc~0 := 2;~a_t~0 := do_read_c_~a~0#1; [2022-11-23 13:48:46,374 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 13:48:46,929 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 13:48:46,929 INFO L300 CfgBuilder]: Removed 17 assume(true) statements. [2022-11-23 13:48:46,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:48:46 BoogieIcfgContainer [2022-11-23 13:48:46,933 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 13:48:46,936 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 13:48:46,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 13:48:46,940 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 13:48:46,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:48:44" (1/3) ... [2022-11-23 13:48:46,942 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@371318e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:48:46, skipping insertion in model container [2022-11-23 13:48:46,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:48:44" (2/3) ... [2022-11-23 13:48:46,944 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@371318e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:48:46, skipping insertion in model container [2022-11-23 13:48:46,944 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:48:46" (3/3) ... [2022-11-23 13:48:46,949 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.10.cil-1.c [2022-11-23 13:48:46,989 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 13:48:46,989 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-23 13:48:47,065 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 13:48:47,073 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@74930479, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 13:48:47,073 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-23 13:48:47,080 INFO L276 IsEmpty]: Start isEmpty. Operand has 251 states, 191 states have (on average 1.544502617801047) internal successors, (295), 199 states have internal predecessors, (295), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 40 states have call predecessors, (42), 42 states have call successors, (42) [2022-11-23 13:48:47,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-23 13:48:47,094 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:47,095 INFO L195 NwaCegarLoop]: 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] [2022-11-23 13:48:47,096 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:47,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:47,103 INFO L85 PathProgramCache]: Analyzing trace with hash -529609248, now seen corresponding path program 1 times [2022-11-23 13:48:47,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:47,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066474371] [2022-11-23 13:48:47,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:47,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:47,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:47,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:48:47,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:47,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066474371] [2022-11-23 13:48:47,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066474371] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:47,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:48:47,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 13:48:47,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193581775] [2022-11-23 13:48:47,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:47,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 13:48:47,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:47,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 13:48:47,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 13:48:47,629 INFO L87 Difference]: Start difference. First operand has 251 states, 191 states have (on average 1.544502617801047) internal successors, (295), 199 states have internal predecessors, (295), 42 states have call successors, (42), 15 states have call predecessors, (42), 15 states have return successors, (42), 40 states have call predecessors, (42), 42 states have call successors, (42) Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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) [2022-11-23 13:48:48,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:48,206 INFO L93 Difference]: Finished difference Result 624 states and 936 transitions. [2022-11-23 13:48:48,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 13:48:48,209 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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 44 [2022-11-23 13:48:48,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:48,234 INFO L225 Difference]: With dead ends: 624 [2022-11-23 13:48:48,235 INFO L226 Difference]: Without dead ends: 374 [2022-11-23 13:48:48,244 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:48:48,247 INFO L413 NwaCegarLoop]: 373 mSDtfsCounter, 429 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 429 SdHoareTripleChecker+Valid, 662 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:48,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [429 Valid, 662 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 13:48:48,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2022-11-23 13:48:48,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 363. [2022-11-23 13:48:48,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 272 states have (on average 1.4522058823529411) internal successors, (395), 277 states have internal predecessors, (395), 62 states have call successors, (62), 29 states have call predecessors, (62), 27 states have return successors, (61), 58 states have call predecessors, (61), 58 states have call successors, (61) [2022-11-23 13:48:48,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 518 transitions. [2022-11-23 13:48:48,361 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 518 transitions. Word has length 44 [2022-11-23 13:48:48,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:48,361 INFO L495 AbstractCegarLoop]: Abstraction has 363 states and 518 transitions. [2022-11-23 13:48:48,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 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) [2022-11-23 13:48:48,362 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 518 transitions. [2022-11-23 13:48:48,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-23 13:48:48,365 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:48,365 INFO L195 NwaCegarLoop]: 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] [2022-11-23 13:48:48,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 13:48:48,367 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:48,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:48,371 INFO L85 PathProgramCache]: Analyzing trace with hash -855837910, now seen corresponding path program 1 times [2022-11-23 13:48:48,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:48,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942877287] [2022-11-23 13:48:48,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:48,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:48,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:48,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:48:48,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:48,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942877287] [2022-11-23 13:48:48,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [942877287] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:48,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:48:48,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:48:48,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585722647] [2022-11-23 13:48:48,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:48,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:48:48,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:48,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:48:48,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:48,556 INFO L87 Difference]: Start difference. First operand 363 states and 518 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) [2022-11-23 13:48:49,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:49,576 INFO L93 Difference]: Finished difference Result 900 states and 1241 transitions. [2022-11-23 13:48:49,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 13:48:49,577 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 [2022-11-23 13:48:49,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:49,580 INFO L225 Difference]: With dead ends: 900 [2022-11-23 13:48:49,580 INFO L226 Difference]: Without dead ends: 434 [2022-11-23 13:48:49,582 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:48:49,583 INFO L413 NwaCegarLoop]: 445 mSDtfsCounter, 922 mSDsluCounter, 695 mSDsCounter, 0 mSdLazyCounter, 790 mSolverCounterSat, 292 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 931 SdHoareTripleChecker+Valid, 1140 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 292 IncrementalHoareTripleChecker+Valid, 790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:49,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [931 Valid, 1140 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [292 Valid, 790 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-23 13:48:49,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2022-11-23 13:48:49,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 349. [2022-11-23 13:48:49,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 258 states have (on average 1.4031007751937985) internal successors, (362), 263 states have internal predecessors, (362), 62 states have call successors, (62), 29 states have call predecessors, (62), 27 states have return successors, (58), 58 states have call predecessors, (58), 58 states have call successors, (58) [2022-11-23 13:48:49,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 482 transitions. [2022-11-23 13:48:49,618 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 482 transitions. Word has length 45 [2022-11-23 13:48:49,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:49,619 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 482 transitions. [2022-11-23 13:48:49,619 INFO L496 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) [2022-11-23 13:48:49,619 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 482 transitions. [2022-11-23 13:48:49,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-23 13:48:49,620 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:49,621 INFO L195 NwaCegarLoop]: 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] [2022-11-23 13:48:49,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 13:48:49,621 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:49,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:49,622 INFO L85 PathProgramCache]: Analyzing trace with hash 397460268, now seen corresponding path program 1 times [2022-11-23 13:48:49,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:49,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872043338] [2022-11-23 13:48:49,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:49,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:49,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:49,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:48:49,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:49,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872043338] [2022-11-23 13:48:49,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872043338] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:49,901 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:48:49,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-23 13:48:49,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153745627] [2022-11-23 13:48:49,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:49,902 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 13:48:49,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:49,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 13:48:49,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-23 13:48:49,904 INFO L87 Difference]: Start difference. First operand 349 states and 482 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) [2022-11-23 13:48:50,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:50,903 INFO L93 Difference]: Finished difference Result 651 states and 850 transitions. [2022-11-23 13:48:50,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 13:48:50,903 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 [2022-11-23 13:48:50,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:50,906 INFO L225 Difference]: With dead ends: 651 [2022-11-23 13:48:50,906 INFO L226 Difference]: Without dead ends: 477 [2022-11-23 13:48:50,907 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:48:50,908 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 515 mSDsluCounter, 843 mSDsCounter, 0 mSdLazyCounter, 1094 mSolverCounterSat, 112 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 1044 SdHoareTripleChecker+Invalid, 1206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 1094 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:50,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [546 Valid, 1044 Invalid, 1206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 1094 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-23 13:48:50,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2022-11-23 13:48:50,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 451. [2022-11-23 13:48:50,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 326 states have (on average 1.361963190184049) internal successors, (444), 331 states have internal predecessors, (444), 82 states have call successors, (82), 43 states have call predecessors, (82), 41 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2022-11-23 13:48:50,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 604 transitions. [2022-11-23 13:48:50,957 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 604 transitions. Word has length 46 [2022-11-23 13:48:50,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:50,958 INFO L495 AbstractCegarLoop]: Abstraction has 451 states and 604 transitions. [2022-11-23 13:48:50,958 INFO L496 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) [2022-11-23 13:48:50,958 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 604 transitions. [2022-11-23 13:48:50,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 13:48:50,959 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:50,960 INFO L195 NwaCegarLoop]: 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] [2022-11-23 13:48:50,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 13:48:50,960 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:50,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:50,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1333074893, now seen corresponding path program 1 times [2022-11-23 13:48:50,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:50,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327817902] [2022-11-23 13:48:50,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:50,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:50,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:51,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:48:51,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:51,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327817902] [2022-11-23 13:48:51,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327817902] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:51,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:48:51,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 13:48:51,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896451724] [2022-11-23 13:48:51,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:51,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:48:51,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:51,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:48:51,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 13:48:51,012 INFO L87 Difference]: Start difference. First operand 451 states and 604 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) [2022-11-23 13:48:51,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:51,165 INFO L93 Difference]: Finished difference Result 716 states and 940 transitions. [2022-11-23 13:48:51,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:48:51,166 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 [2022-11-23 13:48:51,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:51,167 INFO L225 Difference]: With dead ends: 716 [2022-11-23 13:48:51,167 INFO L226 Difference]: Without dead ends: 170 [2022-11-23 13:48:51,168 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:48:51,178 INFO L413 NwaCegarLoop]: 285 mSDtfsCounter, 329 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:51,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [329 Valid, 285 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:48:51,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-11-23 13:48:51,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2022-11-23 13:48:51,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 137 states have (on average 1.5255474452554745) internal successors, (209), 139 states have internal predecessors, (209), 26 states have call successors, (26), 7 states have call predecessors, (26), 6 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2022-11-23 13:48:51,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 259 transitions. [2022-11-23 13:48:51,202 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 259 transitions. Word has length 47 [2022-11-23 13:48:51,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:51,204 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 259 transitions. [2022-11-23 13:48:51,204 INFO L496 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) [2022-11-23 13:48:51,205 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 259 transitions. [2022-11-23 13:48:51,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-11-23 13:48:51,214 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:51,215 INFO L195 NwaCegarLoop]: 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] [2022-11-23 13:48:51,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 13:48:51,215 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:51,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:51,215 INFO L85 PathProgramCache]: Analyzing trace with hash -793776971, now seen corresponding path program 1 times [2022-11-23 13:48:51,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:51,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577593192] [2022-11-23 13:48:51,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:51,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:51,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:51,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 13:48:51,371 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:51,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577593192] [2022-11-23 13:48:51,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577593192] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:51,371 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:48:51,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 13:48:51,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237412496] [2022-11-23 13:48:51,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:51,372 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 13:48:51,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:51,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 13:48:51,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 13:48:51,373 INFO L87 Difference]: Start difference. First operand 170 states and 259 transitions. Second operand has 5 states, 5 states have (on average 10.2) internal successors, (51), 5 states have internal predecessors, (51), 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) [2022-11-23 13:48:52,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:52,266 INFO L93 Difference]: Finished difference Result 948 states and 1540 transitions. [2022-11-23 13:48:52,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 13:48:52,266 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.2) internal successors, (51), 5 states have internal predecessors, (51), 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 62 [2022-11-23 13:48:52,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:52,272 INFO L225 Difference]: With dead ends: 948 [2022-11-23 13:48:52,272 INFO L226 Difference]: Without dead ends: 784 [2022-11-23 13:48:52,273 INFO L412 NwaCegarLoop]: 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 [2022-11-23 13:48:52,274 INFO L413 NwaCegarLoop]: 480 mSDtfsCounter, 1149 mSDsluCounter, 706 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1164 SdHoareTripleChecker+Valid, 1186 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:52,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1164 Valid, 1186 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 13:48:52,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 784 states. [2022-11-23 13:48:52,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 784 to 771. [2022-11-23 13:48:52,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 771 states, 637 states have (on average 1.5211930926216641) internal successors, (969), 642 states have internal predecessors, (969), 103 states have call successors, (103), 31 states have call predecessors, (103), 30 states have return successors, (155), 98 states have call predecessors, (155), 101 states have call successors, (155) [2022-11-23 13:48:52,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 771 states to 771 states and 1227 transitions. [2022-11-23 13:48:52,355 INFO L78 Accepts]: Start accepts. Automaton has 771 states and 1227 transitions. Word has length 62 [2022-11-23 13:48:52,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:52,355 INFO L495 AbstractCegarLoop]: Abstraction has 771 states and 1227 transitions. [2022-11-23 13:48:52,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.2) internal successors, (51), 5 states have internal predecessors, (51), 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) [2022-11-23 13:48:52,356 INFO L276 IsEmpty]: Start isEmpty. Operand 771 states and 1227 transitions. [2022-11-23 13:48:52,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-23 13:48:52,358 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:52,358 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:48:52,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 13:48:52,359 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:52,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:52,359 INFO L85 PathProgramCache]: Analyzing trace with hash 681475985, now seen corresponding path program 1 times [2022-11-23 13:48:52,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:52,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558347689] [2022-11-23 13:48:52,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:52,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:52,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:52,580 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:48:52,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:52,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558347689] [2022-11-23 13:48:52,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558347689] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:48:52,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658965818] [2022-11-23 13:48:52,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:52,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:48:52,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:48:52,587 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:48:52,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 13:48:52,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:52,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 925 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:48:52,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:48:52,927 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-23 13:48:52,927 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:48:52,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658965818] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:52,928 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:48:52,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:48:52,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019634362] [2022-11-23 13:48:52,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:52,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:48:52,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:52,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:48:52,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:52,929 INFO L87 Difference]: Start difference. First operand 771 states and 1227 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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) [2022-11-23 13:48:53,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:53,285 INFO L93 Difference]: Finished difference Result 2285 states and 3745 transitions. [2022-11-23 13:48:53,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:48:53,286 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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 123 [2022-11-23 13:48:53,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:53,297 INFO L225 Difference]: With dead ends: 2285 [2022-11-23 13:48:53,298 INFO L226 Difference]: Without dead ends: 1520 [2022-11-23 13:48:53,304 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:53,305 INFO L413 NwaCegarLoop]: 234 mSDtfsCounter, 231 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:53,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 437 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 13:48:53,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1520 states. [2022-11-23 13:48:53,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1520 to 1511. [2022-11-23 13:48:53,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1511 states, 1255 states have (on average 1.5171314741035857) internal successors, (1904), 1263 states have internal predecessors, (1904), 195 states have call successors, (195), 61 states have call predecessors, (195), 60 states have return successors, (297), 187 states have call predecessors, (297), 193 states have call successors, (297) [2022-11-23 13:48:53,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1511 states to 1511 states and 2396 transitions. [2022-11-23 13:48:53,497 INFO L78 Accepts]: Start accepts. Automaton has 1511 states and 2396 transitions. Word has length 123 [2022-11-23 13:48:53,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:53,498 INFO L495 AbstractCegarLoop]: Abstraction has 1511 states and 2396 transitions. [2022-11-23 13:48:53,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 2 states have internal predecessors, (77), 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) [2022-11-23 13:48:53,498 INFO L276 IsEmpty]: Start isEmpty. Operand 1511 states and 2396 transitions. [2022-11-23 13:48:53,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-23 13:48:53,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:53,510 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:48:53,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 13:48:53,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:48:53,719 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:53,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:53,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1999679183, now seen corresponding path program 1 times [2022-11-23 13:48:53,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:53,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117036084] [2022-11-23 13:48:53,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:53,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:53,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:53,920 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:48:53,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:53,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117036084] [2022-11-23 13:48:53,921 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117036084] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:48:53,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736037244] [2022-11-23 13:48:53,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:53,921 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:48:53,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:48:53,923 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:48:53,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 13:48:54,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:54,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 919 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:48:54,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:48:54,292 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-23 13:48:54,293 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:48:54,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736037244] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:54,293 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:48:54,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:48:54,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87313798] [2022-11-23 13:48:54,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:54,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:48:54,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:54,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:48:54,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:54,295 INFO L87 Difference]: Start difference. First operand 1511 states and 2396 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 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) [2022-11-23 13:48:54,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:54,698 INFO L93 Difference]: Finished difference Result 4490 states and 7326 transitions. [2022-11-23 13:48:54,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:48:54,699 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 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 123 [2022-11-23 13:48:54,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:54,719 INFO L225 Difference]: With dead ends: 4490 [2022-11-23 13:48:54,719 INFO L226 Difference]: Without dead ends: 2985 [2022-11-23 13:48:54,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:54,729 INFO L413 NwaCegarLoop]: 234 mSDtfsCounter, 228 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:54,730 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 437 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:48:54,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2985 states. [2022-11-23 13:48:55,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2985 to 2971. [2022-11-23 13:48:55,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2971 states, 2476 states have (on average 1.5121163166397416) internal successors, (3744), 2490 states have internal predecessors, (3744), 374 states have call successors, (374), 121 states have call predecessors, (374), 120 states have return successors, (572), 360 states have call predecessors, (572), 372 states have call successors, (572) [2022-11-23 13:48:55,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2971 states to 2971 states and 4690 transitions. [2022-11-23 13:48:55,035 INFO L78 Accepts]: Start accepts. Automaton has 2971 states and 4690 transitions. Word has length 123 [2022-11-23 13:48:55,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:55,035 INFO L495 AbstractCegarLoop]: Abstraction has 2971 states and 4690 transitions. [2022-11-23 13:48:55,035 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 2 states have internal predecessors, (80), 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) [2022-11-23 13:48:55,036 INFO L276 IsEmpty]: Start isEmpty. Operand 2971 states and 4690 transitions. [2022-11-23 13:48:55,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-23 13:48:55,043 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:55,043 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:48:55,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 13:48:55,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:48:55,250 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:55,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:55,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1534532719, now seen corresponding path program 1 times [2022-11-23 13:48:55,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:55,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700810478] [2022-11-23 13:48:55,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:55,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:55,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:55,440 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:48:55,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:55,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700810478] [2022-11-23 13:48:55,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700810478] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:48:55,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662884551] [2022-11-23 13:48:55,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:55,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:48:55,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:48:55,444 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:48:55,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 13:48:55,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:55,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 913 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:48:55,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:48:55,804 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 13:48:55,804 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:48:55,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662884551] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:55,805 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:48:55,805 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:48:55,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929755313] [2022-11-23 13:48:55,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:55,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:48:55,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:55,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:48:55,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:55,808 INFO L87 Difference]: Start difference. First operand 2971 states and 4690 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 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) [2022-11-23 13:48:56,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:56,416 INFO L93 Difference]: Finished difference Result 8840 states and 14347 transitions. [2022-11-23 13:48:56,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:48:56,416 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 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 123 [2022-11-23 13:48:56,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:56,452 INFO L225 Difference]: With dead ends: 8840 [2022-11-23 13:48:56,452 INFO L226 Difference]: Without dead ends: 5875 [2022-11-23 13:48:56,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:56,465 INFO L413 NwaCegarLoop]: 231 mSDtfsCounter, 210 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:56,465 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 434 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:48:56,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5875 states. [2022-11-23 13:48:57,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5875 to 5851. [2022-11-23 13:48:57,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5851 states, 4888 states have (on average 1.5065466448445173) internal successors, (7364), 4914 states have internal predecessors, (7364), 722 states have call successors, (722), 241 states have call predecessors, (722), 240 states have return successors, (1104), 696 states have call predecessors, (1104), 720 states have call successors, (1104) [2022-11-23 13:48:57,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5851 states to 5851 states and 9190 transitions. [2022-11-23 13:48:57,116 INFO L78 Accepts]: Start accepts. Automaton has 5851 states and 9190 transitions. Word has length 123 [2022-11-23 13:48:57,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:48:57,116 INFO L495 AbstractCegarLoop]: Abstraction has 5851 states and 9190 transitions. [2022-11-23 13:48:57,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 2 states have internal predecessors, (98), 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) [2022-11-23 13:48:57,117 INFO L276 IsEmpty]: Start isEmpty. Operand 5851 states and 9190 transitions. [2022-11-23 13:48:57,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-23 13:48:57,125 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:48:57,125 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:48:57,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 13:48:57,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-23 13:48:57,341 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:48:57,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:48:57,341 INFO L85 PathProgramCache]: Analyzing trace with hash -995865103, now seen corresponding path program 1 times [2022-11-23 13:48:57,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:48:57,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292287112] [2022-11-23 13:48:57,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:57,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:48:57,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:57,506 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:48:57,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:48:57,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292287112] [2022-11-23 13:48:57,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292287112] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:48:57,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49510283] [2022-11-23 13:48:57,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:48:57,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:48:57,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:48:57,508 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:48:57,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 13:48:57,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:48:57,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 907 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:48:57,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:48:57,828 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 13:48:57,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:48:57,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49510283] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:48:57,829 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:48:57,829 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:48:57,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521086940] [2022-11-23 13:48:57,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:48:57,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:48:57,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:48:57,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:48:57,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:57,830 INFO L87 Difference]: Start difference. First operand 5851 states and 9190 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 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) [2022-11-23 13:48:58,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:48:58,745 INFO L93 Difference]: Finished difference Result 17420 states and 28107 transitions. [2022-11-23 13:48:58,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:48:58,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 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 123 [2022-11-23 13:48:58,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:48:58,816 INFO L225 Difference]: With dead ends: 17420 [2022-11-23 13:48:58,817 INFO L226 Difference]: Without dead ends: 11575 [2022-11-23 13:48:58,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:48:58,849 INFO L413 NwaCegarLoop]: 231 mSDtfsCounter, 216 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:48:58,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 434 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:48:58,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11575 states. [2022-11-23 13:49:00,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11575 to 11531. [2022-11-23 13:49:00,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11531 states, 9652 states have (on average 1.500621632822213) internal successors, (14484), 9702 states have internal predecessors, (14484), 1398 states have call successors, (1398), 481 states have call predecessors, (1398), 480 states have return successors, (2132), 1348 states have call predecessors, (2132), 1396 states have call successors, (2132) [2022-11-23 13:49:00,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11531 states to 11531 states and 18014 transitions. [2022-11-23 13:49:00,126 INFO L78 Accepts]: Start accepts. Automaton has 11531 states and 18014 transitions. Word has length 123 [2022-11-23 13:49:00,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:49:00,127 INFO L495 AbstractCegarLoop]: Abstraction has 11531 states and 18014 transitions. [2022-11-23 13:49:00,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 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) [2022-11-23 13:49:00,128 INFO L276 IsEmpty]: Start isEmpty. Operand 11531 states and 18014 transitions. [2022-11-23 13:49:00,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-23 13:49:00,146 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:49:00,146 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:49:00,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 13:49:00,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-23 13:49:00,352 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:49:00,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:49:00,353 INFO L85 PathProgramCache]: Analyzing trace with hash 1331589201, now seen corresponding path program 1 times [2022-11-23 13:49:00,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:49:00,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965760921] [2022-11-23 13:49:00,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:49:00,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:49:00,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:49:00,571 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 13:49:00,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:49:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965760921] [2022-11-23 13:49:00,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965760921] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 13:49:00,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371314889] [2022-11-23 13:49:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:49:00,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:49:00,573 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 13:49:00,574 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 13:49:00,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 13:49:00,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:49:00,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 901 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 13:49:00,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 13:49:00,883 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 13:49:00,884 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 13:49:00,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371314889] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:49:00,884 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 13:49:00,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-23 13:49:00,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509118306] [2022-11-23 13:49:00,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:49:00,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 13:49:00,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:49:00,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 13:49:00,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:49:00,886 INFO L87 Difference]: Start difference. First operand 11531 states and 18014 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2022-11-23 13:49:02,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:49:02,826 INFO L93 Difference]: Finished difference Result 34340 states and 55063 transitions. [2022-11-23 13:49:02,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 13:49:02,827 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 123 [2022-11-23 13:49:02,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:49:02,981 INFO L225 Difference]: With dead ends: 34340 [2022-11-23 13:49:02,981 INFO L226 Difference]: Without dead ends: 22815 [2022-11-23 13:49:03,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:49:03,048 INFO L413 NwaCegarLoop]: 231 mSDtfsCounter, 222 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 13:49:03,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 434 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 13:49:03,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22815 states. [2022-11-23 13:49:05,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22815 to 22731. [2022-11-23 13:49:05,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22731 states, 19060 states have (on average 1.4944386149003148) internal successors, (28484), 19158 states have internal predecessors, (28484), 2710 states have call successors, (2710), 961 states have call predecessors, (2710), 960 states have return successors, (4116), 2612 states have call predecessors, (4116), 2708 states have call successors, (4116) [2022-11-23 13:49:05,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22731 states to 22731 states and 35310 transitions. [2022-11-23 13:49:05,288 INFO L78 Accepts]: Start accepts. Automaton has 22731 states and 35310 transitions. Word has length 123 [2022-11-23 13:49:05,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:49:05,289 INFO L495 AbstractCegarLoop]: Abstraction has 22731 states and 35310 transitions. [2022-11-23 13:49:05,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2022-11-23 13:49:05,289 INFO L276 IsEmpty]: Start isEmpty. Operand 22731 states and 35310 transitions. [2022-11-23 13:49:05,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-23 13:49:05,321 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:49:05,321 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:49:05,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 13:49:05,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c99a6c03-7ebe-4646-83f8-a2b06605d6e7/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 13:49:05,529 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:49:05,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:49:05,529 INFO L85 PathProgramCache]: Analyzing trace with hash -791852367, now seen corresponding path program 1 times [2022-11-23 13:49:05,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:49:05,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82000282] [2022-11-23 13:49:05,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:49:05,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:49:05,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:49:06,259 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-23 13:49:06,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:49:06,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82000282] [2022-11-23 13:49:06,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82000282] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:49:06,260 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:49:06,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:49:06,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867772637] [2022-11-23 13:49:06,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:49:06,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:49:06,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:49:06,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:49:06,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:49:06,262 INFO L87 Difference]: Start difference. First operand 22731 states and 35310 transitions. Second operand has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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) [2022-11-23 13:49:09,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:49:09,836 INFO L93 Difference]: Finished difference Result 59379 states and 93428 transitions. [2022-11-23 13:49:09,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 13:49:09,836 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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 123 [2022-11-23 13:49:09,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:49:10,017 INFO L225 Difference]: With dead ends: 59379 [2022-11-23 13:49:10,017 INFO L226 Difference]: Without dead ends: 36655 [2022-11-23 13:49:10,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-23 13:49:10,074 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 753 mSDsluCounter, 549 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 759 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 143 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 13:49:10,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [759 Valid, 776 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [143 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 13:49:10,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36655 states. [2022-11-23 13:49:12,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36655 to 33771. [2022-11-23 13:49:12,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33771 states, 28308 states have (on average 1.4894729405115161) internal successors, (42164), 28454 states have internal predecessors, (42164), 4022 states have call successors, (4022), 1441 states have call predecessors, (4022), 1440 states have return successors, (6100), 3876 states have call predecessors, (6100), 4020 states have call successors, (6100) [2022-11-23 13:49:12,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33771 states to 33771 states and 52286 transitions. [2022-11-23 13:49:12,869 INFO L78 Accepts]: Start accepts. Automaton has 33771 states and 52286 transitions. Word has length 123 [2022-11-23 13:49:12,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:49:12,870 INFO L495 AbstractCegarLoop]: Abstraction has 33771 states and 52286 transitions. [2022-11-23 13:49:12,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 11.833333333333334) internal successors, (71), 6 states have internal predecessors, (71), 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) [2022-11-23 13:49:12,870 INFO L276 IsEmpty]: Start isEmpty. Operand 33771 states and 52286 transitions. [2022-11-23 13:49:13,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-23 13:49:13,082 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:49:13,083 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:49:13,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-23 13:49:13,083 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:49:13,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:49:13,083 INFO L85 PathProgramCache]: Analyzing trace with hash 1860619354, now seen corresponding path program 1 times [2022-11-23 13:49:13,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:49:13,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199331052] [2022-11-23 13:49:13,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:49:13,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:49:13,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:49:13,668 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-23 13:49:13,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:49:13,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199331052] [2022-11-23 13:49:13,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1199331052] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:49:13,669 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:49:13,669 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:49:13,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710598495] [2022-11-23 13:49:13,669 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:49:13,670 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:49:13,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:49:13,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:49:13,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:49:13,671 INFO L87 Difference]: Start difference. First operand 33771 states and 52286 transitions. Second operand has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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) [2022-11-23 13:49:18,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:49:18,372 INFO L93 Difference]: Finished difference Result 94259 states and 147348 transitions. [2022-11-23 13:49:18,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 13:49:18,373 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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 124 [2022-11-23 13:49:18,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:49:18,682 INFO L225 Difference]: With dead ends: 94259 [2022-11-23 13:49:18,683 INFO L226 Difference]: Without dead ends: 60495 [2022-11-23 13:49:18,793 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-23 13:49:18,793 INFO L413 NwaCegarLoop]: 255 mSDtfsCounter, 856 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 863 SdHoareTripleChecker+Valid, 736 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 13:49:18,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [863 Valid, 736 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 13:49:18,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60495 states. [2022-11-23 13:49:23,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60495 to 53451. [2022-11-23 13:49:23,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53451 states, 44772 states have (on average 1.4820870186723845) internal successors, (66356), 45014 states have internal predecessors, (66356), 6374 states have call successors, (6374), 2305 states have call predecessors, (6374), 2304 states have return successors, (9940), 6132 states have call predecessors, (9940), 6372 states have call successors, (9940) [2022-11-23 13:49:23,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53451 states to 53451 states and 82670 transitions. [2022-11-23 13:49:23,577 INFO L78 Accepts]: Start accepts. Automaton has 53451 states and 82670 transitions. Word has length 124 [2022-11-23 13:49:23,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 13:49:23,577 INFO L495 AbstractCegarLoop]: Abstraction has 53451 states and 82670 transitions. [2022-11-23 13:49:23,578 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.0) internal successors, (72), 6 states have internal predecessors, (72), 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) [2022-11-23 13:49:23,578 INFO L276 IsEmpty]: Start isEmpty. Operand 53451 states and 82670 transitions. [2022-11-23 13:49:23,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-23 13:49:23,635 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 13:49:23,635 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 13:49:23,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-23 13:49:23,635 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 13:49:23,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 13:49:23,636 INFO L85 PathProgramCache]: Analyzing trace with hash 601339477, now seen corresponding path program 1 times [2022-11-23 13:49:23,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 13:49:23,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [873659161] [2022-11-23 13:49:23,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 13:49:23,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 13:49:23,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 13:49:24,141 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-23 13:49:24,142 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 13:49:24,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [873659161] [2022-11-23 13:49:24,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [873659161] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 13:49:24,142 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 13:49:24,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 13:49:24,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35897974] [2022-11-23 13:49:24,143 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 13:49:24,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 13:49:24,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 13:49:24,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 13:49:24,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 13:49:24,144 INFO L87 Difference]: Start difference. First operand 53451 states and 82670 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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) [2022-11-23 13:49:32,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 13:49:32,233 INFO L93 Difference]: Finished difference Result 144051 states and 225092 transitions. [2022-11-23 13:49:32,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-23 13:49:32,235 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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 125 [2022-11-23 13:49:32,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 13:49:32,709 INFO L225 Difference]: With dead ends: 144051 [2022-11-23 13:49:32,709 INFO L226 Difference]: Without dead ends: 90607 [2022-11-23 13:49:32,930 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-23 13:49:32,931 INFO L413 NwaCegarLoop]: 224 mSDtfsCounter, 843 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 849 SdHoareTripleChecker+Valid, 664 SdHoareTripleChecker+Invalid, 421 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-23 13:49:32,932 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [849 Valid, 664 Invalid, 421 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-23 13:49:33,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90607 states.