./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS --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 0e49baa02682605d5c6b8a86e9e1d38b2cd4076796b3122e76d3b43b5274a0df --- 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-8393723 [2022-11-19 08:26:46,211 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:26:46,214 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:26:46,266 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:26:46,268 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:26:46,269 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:26:46,272 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:26:46,277 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:26:46,282 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:26:46,284 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:26:46,286 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:26:46,288 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:26:46,290 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:26:46,293 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:26:46,295 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:26:46,297 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:26:46,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:26:46,304 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:26:46,306 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:26:46,308 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:26:46,313 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:26:46,314 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:26:46,316 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:26:46,318 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:26:46,324 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:26:46,330 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:26:46,330 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:26:46,331 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:26:46,333 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:26:46,334 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:26:46,334 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:26:46,336 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:26:46,338 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:26:46,339 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:26:46,342 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:26:46,342 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:26:46,343 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:26:46,343 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:26:46,344 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:26:46,345 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:26:46,345 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:26:46,346 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:26:46,392 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:26:46,392 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:26:46,393 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:26:46,393 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:26:46,394 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:26:46,394 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:26:46,395 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:26:46,395 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:26:46,395 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:26:46,395 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:26:46,397 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:26:46,397 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:26:46,397 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:26:46,398 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:26:46,398 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:26:46,398 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:26:46,398 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:26:46,399 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:26:46,400 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:26:46,400 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:26:46,400 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:26:46,400 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:26:46,401 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:26:46,402 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:26:46,403 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:26:46,403 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:26:46,403 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:26:46,403 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:26:46,404 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:26:46,404 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:26:46,404 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:26:46,405 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:26:46,405 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:26:46,405 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:26:46,406 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:26:46,406 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:26:46,406 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:26:46,406 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:26:46,406 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:26:46,407 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:26:46,407 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:26:46,407 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_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0e49baa02682605d5c6b8a86e9e1d38b2cd4076796b3122e76d3b43b5274a0df [2022-11-19 08:26:46,711 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:26:46,738 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:26:46,742 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:26:46,743 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:26:46,744 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:26:46,746 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c [2022-11-19 08:26:46,838 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/data/6d348de34/9f8f0cc7552b493e882e60e98d96dfb0/FLAG02f6f1b28 [2022-11-19 08:26:47,457 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:26:47,458 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c [2022-11-19 08:26:47,489 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/data/6d348de34/9f8f0cc7552b493e882e60e98d96dfb0/FLAG02f6f1b28 [2022-11-19 08:26:47,753 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/data/6d348de34/9f8f0cc7552b493e882e60e98d96dfb0 [2022-11-19 08:26:47,756 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:26:47,757 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:26:47,768 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:26:47,768 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:26:47,773 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:26:47,774 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:26:47" (1/1) ... [2022-11-19 08:26:47,775 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4274b77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:47, skipping insertion in model container [2022-11-19 08:26:47,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:26:47" (1/1) ... [2022-11-19 08:26:47,785 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:26:47,883 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:26:48,115 WARN L234 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_a8d25320-c844-4772-a23d-aea9b5dc20bf/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c[911,924] [2022-11-19 08:26:48,242 WARN L234 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_a8d25320-c844-4772-a23d-aea9b5dc20bf/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c[8416,8429] [2022-11-19 08:26:48,463 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:26:48,475 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:26:48,489 WARN L234 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_a8d25320-c844-4772-a23d-aea9b5dc20bf/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c[911,924] [2022-11-19 08:26:48,507 WARN L234 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_a8d25320-c844-4772-a23d-aea9b5dc20bf/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.13.cil-1.c[8416,8429] [2022-11-19 08:26:48,557 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:26:48,585 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:26:48,586 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48 WrapperNode [2022-11-19 08:26:48,586 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:26:48,588 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:26:48,588 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:26:48,588 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:26:48,597 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,626 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,734 INFO L138 Inliner]: procedures = 81, calls = 101, calls flagged for inlining = 49, calls inlined = 49, statements flattened = 1141 [2022-11-19 08:26:48,734 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:26:48,735 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:26:48,735 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:26:48,736 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:26:48,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,753 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,758 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,758 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,796 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,802 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,806 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,815 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:26:48,816 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:26:48,816 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:26:48,816 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:26:48,823 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (1/1) ... [2022-11-19 08:26:48,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:26:48,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:26:48,885 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:26:48,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:26:48,954 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:26:48,954 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-19 08:26:48,955 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-19 08:26:48,955 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-11-19 08:26:48,955 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-11-19 08:26:48,955 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-19 08:26:48,956 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-19 08:26:48,956 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-19 08:26:48,956 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-19 08:26:48,956 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-11-19 08:26:48,957 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-11-19 08:26:48,957 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-19 08:26:48,957 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-19 08:26:48,957 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-19 08:26:48,958 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-19 08:26:48,958 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-11-19 08:26:48,958 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-11-19 08:26:48,958 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-11-19 08:26:48,959 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-11-19 08:26:48,959 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-11-19 08:26:48,959 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-11-19 08:26:48,959 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-19 08:26:48,959 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-19 08:26:48,960 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:26:48,960 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-19 08:26:48,960 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-19 08:26:48,960 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-11-19 08:26:48,961 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-11-19 08:26:48,961 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:26:48,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:26:48,961 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-19 08:26:48,962 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-19 08:26:48,962 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-19 08:26:48,962 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-19 08:26:49,133 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:26:49,136 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:26:50,530 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2022-11-19 08:26:50,531 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; [2022-11-19 08:26:50,632 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:26:51,370 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:26:51,370 INFO L300 CfgBuilder]: Removed 20 assume(true) statements. [2022-11-19 08:26:51,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:26:51 BoogieIcfgContainer [2022-11-19 08:26:51,378 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:26:51,381 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:26:51,382 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:26:51,386 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:26:51,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:26:47" (1/3) ... [2022-11-19 08:26:51,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@426b020a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:26:51, skipping insertion in model container [2022-11-19 08:26:51,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:26:48" (2/3) ... [2022-11-19 08:26:51,389 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@426b020a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:26:51, skipping insertion in model container [2022-11-19 08:26:51,389 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:26:51" (3/3) ... [2022-11-19 08:26:51,391 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.13.cil-1.c [2022-11-19 08:26:51,414 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:26:51,414 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-19 08:26:51,527 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:26:51,543 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;@7970d6eb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:26:51,544 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-19 08:26:51,550 INFO L276 IsEmpty]: Start isEmpty. Operand has 284 states, 221 states have (on average 1.5520361990950227) internal successors, (343), 229 states have internal predecessors, (343), 45 states have call successors, (45), 15 states have call predecessors, (45), 15 states have return successors, (45), 43 states have call predecessors, (45), 45 states have call successors, (45) [2022-11-19 08:26:51,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 08:26:51,563 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:51,564 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] [2022-11-19 08:26:51,564 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:51,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:51,571 INFO L85 PathProgramCache]: Analyzing trace with hash -1423471146, now seen corresponding path program 1 times [2022-11-19 08:26:51,582 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:51,582 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092980308] [2022-11-19 08:26:51,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:51,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:51,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:51,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:26:51,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:51,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092980308] [2022-11-19 08:26:51,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092980308] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:26:51,977 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:26:51,978 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 08:26:51,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82550784] [2022-11-19 08:26:51,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:26:51,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:26:51,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:26:52,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:26:52,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:26:52,040 INFO L87 Difference]: Start difference. First operand has 284 states, 221 states have (on average 1.5520361990950227) internal successors, (343), 229 states have internal predecessors, (343), 45 states have call successors, (45), 15 states have call predecessors, (45), 15 states have return successors, (45), 43 states have call predecessors, (45), 45 states have call successors, (45) 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) [2022-11-19 08:26:52,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:26:52,794 INFO L93 Difference]: Finished difference Result 690 states and 1044 transitions. [2022-11-19 08:26:52,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:26:52,797 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 [2022-11-19 08:26:52,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:26:52,825 INFO L225 Difference]: With dead ends: 690 [2022-11-19 08:26:52,826 INFO L226 Difference]: Without dead ends: 407 [2022-11-19 08:26:52,836 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 [2022-11-19 08:26:52,842 INFO L413 NwaCegarLoop]: 418 mSDtfsCounter, 483 mSDsluCounter, 328 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 483 SdHoareTripleChecker+Valid, 746 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:26:52,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [483 Valid, 746 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 08:26:52,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-11-19 08:26:52,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 396. [2022-11-19 08:26:52,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 302 states have (on average 1.466887417218543) internal successors, (443), 307 states have internal predecessors, (443), 65 states have call successors, (65), 29 states have call predecessors, (65), 27 states have return successors, (64), 61 states have call predecessors, (64), 61 states have call successors, (64) [2022-11-19 08:26:52,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 572 transitions. [2022-11-19 08:26:52,963 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 572 transitions. Word has length 44 [2022-11-19 08:26:52,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:26:52,964 INFO L495 AbstractCegarLoop]: Abstraction has 396 states and 572 transitions. [2022-11-19 08:26:52,964 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) [2022-11-19 08:26:52,965 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 572 transitions. [2022-11-19 08:26:52,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-19 08:26:52,970 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:52,970 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] [2022-11-19 08:26:52,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 08:26:52,972 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:52,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:52,976 INFO L85 PathProgramCache]: Analyzing trace with hash 572109293, now seen corresponding path program 1 times [2022-11-19 08:26:52,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:52,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787818757] [2022-11-19 08:26:52,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:52,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:53,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:53,163 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:26:53,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:53,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787818757] [2022-11-19 08:26:53,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787818757] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:26:53,165 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:26:53,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:26:53,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117146021] [2022-11-19 08:26:53,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:26:53,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:26:53,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:26:53,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:26:53,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:26:53,168 INFO L87 Difference]: Start difference. First operand 396 states and 572 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) [2022-11-19 08:26:54,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:26:54,144 INFO L93 Difference]: Finished difference Result 933 states and 1295 transitions. [2022-11-19 08:26:54,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:26:54,145 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 [2022-11-19 08:26:54,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:26:54,151 INFO L225 Difference]: With dead ends: 933 [2022-11-19 08:26:54,151 INFO L226 Difference]: Without dead ends: 467 [2022-11-19 08:26:54,154 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 [2022-11-19 08:26:54,156 INFO L413 NwaCegarLoop]: 490 mSDtfsCounter, 1018 mSDsluCounter, 770 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1026 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 1134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:26:54,157 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1026 Valid, 1260 Invalid, 1134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 08:26:54,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2022-11-19 08:26:54,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 382. [2022-11-19 08:26:54,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 288 states have (on average 1.4236111111111112) internal successors, (410), 293 states have internal predecessors, (410), 65 states have call successors, (65), 29 states have call predecessors, (65), 27 states have return successors, (61), 61 states have call predecessors, (61), 61 states have call successors, (61) [2022-11-19 08:26:54,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 536 transitions. [2022-11-19 08:26:54,207 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 536 transitions. Word has length 45 [2022-11-19 08:26:54,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:26:54,207 INFO L495 AbstractCegarLoop]: Abstraction has 382 states and 536 transitions. [2022-11-19 08:26:54,208 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) [2022-11-19 08:26:54,208 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 536 transitions. [2022-11-19 08:26:54,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 08:26:54,215 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:54,215 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] [2022-11-19 08:26:54,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 08:26:54,215 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:54,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:54,225 INFO L85 PathProgramCache]: Analyzing trace with hash 457873785, now seen corresponding path program 1 times [2022-11-19 08:26:54,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:54,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490111545] [2022-11-19 08:26:54,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:54,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:54,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:54,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:26:54,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:54,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490111545] [2022-11-19 08:26:54,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490111545] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:26:54,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:26:54,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:26:54,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764742620] [2022-11-19 08:26:54,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:26:54,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:26:54,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:26:54,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:26:54,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:26:54,407 INFO L87 Difference]: Start difference. First operand 382 states and 536 transitions. Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 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) [2022-11-19 08:26:55,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:26:55,564 INFO L93 Difference]: Finished difference Result 848 states and 1144 transitions. [2022-11-19 08:26:55,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 08:26:55,565 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 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 46 [2022-11-19 08:26:55,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:26:55,571 INFO L225 Difference]: With dead ends: 848 [2022-11-19 08:26:55,571 INFO L226 Difference]: Without dead ends: 671 [2022-11-19 08:26:55,572 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 [2022-11-19 08:26:55,574 INFO L413 NwaCegarLoop]: 473 mSDtfsCounter, 932 mSDsluCounter, 729 mSDsCounter, 0 mSdLazyCounter, 715 mSolverCounterSat, 304 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 941 SdHoareTripleChecker+Valid, 1202 SdHoareTripleChecker+Invalid, 1019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 304 IncrementalHoareTripleChecker+Valid, 715 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:26:55,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [941 Valid, 1202 Invalid, 1019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [304 Valid, 715 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 08:26:55,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2022-11-19 08:26:55,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 646. [2022-11-19 08:26:55,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 646 states, 469 states have (on average 1.3411513859275053) internal successors, (629), 474 states have internal predecessors, (629), 114 states have call successors, (114), 63 states have call predecessors, (114), 61 states have return successors, (127), 110 states have call predecessors, (127), 110 states have call successors, (127) [2022-11-19 08:26:55,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 646 states to 646 states and 870 transitions. [2022-11-19 08:26:55,656 INFO L78 Accepts]: Start accepts. Automaton has 646 states and 870 transitions. Word has length 46 [2022-11-19 08:26:55,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:26:55,656 INFO L495 AbstractCegarLoop]: Abstraction has 646 states and 870 transitions. [2022-11-19 08:26:55,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 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) [2022-11-19 08:26:55,657 INFO L276 IsEmpty]: Start isEmpty. Operand 646 states and 870 transitions. [2022-11-19 08:26:55,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 08:26:55,661 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:55,661 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] [2022-11-19 08:26:55,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 08:26:55,662 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:55,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:55,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1891113718, now seen corresponding path program 1 times [2022-11-19 08:26:55,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:55,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693934145] [2022-11-19 08:26:55,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:55,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:55,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:55,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:26:55,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:55,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693934145] [2022-11-19 08:26:55,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693934145] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:26:55,781 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:26:55,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:26:55,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238135466] [2022-11-19 08:26:55,782 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:26:55,782 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:26:55,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:26:55,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:26:55,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:26:55,784 INFO L87 Difference]: Start difference. First operand 646 states and 870 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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) [2022-11-19 08:26:55,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:26:55,976 INFO L93 Difference]: Finished difference Result 647 states and 871 transitions. [2022-11-19 08:26:55,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:26:55,977 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 50 [2022-11-19 08:26:55,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:26:55,979 INFO L225 Difference]: With dead ends: 647 [2022-11-19 08:26:55,980 INFO L226 Difference]: Without dead ends: 203 [2022-11-19 08:26:55,981 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 [2022-11-19 08:26:55,992 INFO L413 NwaCegarLoop]: 330 mSDtfsCounter, 380 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:26:55,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [380 Valid, 330 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:26:55,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2022-11-19 08:26:56,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 203. [2022-11-19 08:26:56,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 167 states have (on average 1.5389221556886228) internal successors, (257), 169 states have internal predecessors, (257), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2022-11-19 08:26:56,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 313 transitions. [2022-11-19 08:26:56,023 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 313 transitions. Word has length 50 [2022-11-19 08:26:56,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:26:56,026 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 313 transitions. [2022-11-19 08:26:56,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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) [2022-11-19 08:26:56,027 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 313 transitions. [2022-11-19 08:26:56,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-19 08:26:56,035 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:56,036 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:26:56,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-19 08:26:56,036 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:56,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:56,037 INFO L85 PathProgramCache]: Analyzing trace with hash 671062315, now seen corresponding path program 1 times [2022-11-19 08:26:56,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:56,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103861955] [2022-11-19 08:26:56,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:56,043 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:56,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:56,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 08:26:56,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:56,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103861955] [2022-11-19 08:26:56,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103861955] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:26:56,318 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:26:56,318 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:26:56,319 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357487011] [2022-11-19 08:26:56,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:26:56,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:26:56,320 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:26:56,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:26:56,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:26:56,321 INFO L87 Difference]: Start difference. First operand 203 states and 313 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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) [2022-11-19 08:26:57,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:26:57,708 INFO L93 Difference]: Finished difference Result 1146 states and 1885 transitions. [2022-11-19 08:26:57,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:26:57,709 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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 71 [2022-11-19 08:26:57,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:26:57,719 INFO L225 Difference]: With dead ends: 1146 [2022-11-19 08:26:57,719 INFO L226 Difference]: Without dead ends: 949 [2022-11-19 08:26:57,721 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 [2022-11-19 08:26:57,727 INFO L413 NwaCegarLoop]: 585 mSDtfsCounter, 1431 mSDsluCounter, 871 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1449 SdHoareTripleChecker+Valid, 1456 SdHoareTripleChecker+Invalid, 900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:26:57,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1449 Valid, 1456 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-19 08:26:57,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 949 states. [2022-11-19 08:26:57,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 949 to 936. [2022-11-19 08:26:57,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 936 states, 787 states have (on average 1.5362134688691234) internal successors, (1209), 792 states have internal predecessors, (1209), 118 states have call successors, (118), 31 states have call predecessors, (118), 30 states have return successors, (182), 113 states have call predecessors, (182), 116 states have call successors, (182) [2022-11-19 08:26:57,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1509 transitions. [2022-11-19 08:26:57,857 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1509 transitions. Word has length 71 [2022-11-19 08:26:57,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:26:57,858 INFO L495 AbstractCegarLoop]: Abstraction has 936 states and 1509 transitions. [2022-11-19 08:26:57,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 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) [2022-11-19 08:26:57,858 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1509 transitions. [2022-11-19 08:26:57,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:26:57,862 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:57,862 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:26:57,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-19 08:26:57,863 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:57,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:57,864 INFO L85 PathProgramCache]: Analyzing trace with hash 894308303, now seen corresponding path program 1 times [2022-11-19 08:26:57,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:57,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704146796] [2022-11-19 08:26:57,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:57,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:57,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:58,201 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:26:58,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:58,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704146796] [2022-11-19 08:26:58,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704146796] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:26:58,202 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478906413] [2022-11-19 08:26:58,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:58,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:26:58,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:26:58,207 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:26:58,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:26:58,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:58,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 1135 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:26:58,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:26:58,687 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-19 08:26:58,688 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:26:58,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478906413] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:26:58,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:26:58,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:26:58,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484305014] [2022-11-19 08:26:58,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:26:58,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:26:58,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:26:58,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:26:58,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:26:58,691 INFO L87 Difference]: Start difference. First operand 936 states and 1509 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2022-11-19 08:26:59,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:26:59,083 INFO L93 Difference]: Finished difference Result 2780 states and 4618 transitions. [2022-11-19 08:26:59,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:26:59,084 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 144 [2022-11-19 08:26:59,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:26:59,097 INFO L225 Difference]: With dead ends: 2780 [2022-11-19 08:26:59,097 INFO L226 Difference]: Without dead ends: 1850 [2022-11-19 08:26:59,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:26:59,130 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 285 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 285 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:26:59,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [285 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:26:59,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1850 states. [2022-11-19 08:26:59,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1850 to 1841. [2022-11-19 08:26:59,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1841 states, 1555 states have (on average 1.5331189710610933) internal successors, (2384), 1563 states have internal predecessors, (2384), 225 states have call successors, (225), 61 states have call predecessors, (225), 60 states have return successors, (351), 217 states have call predecessors, (351), 223 states have call successors, (351) [2022-11-19 08:26:59,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1841 states to 1841 states and 2960 transitions. [2022-11-19 08:26:59,365 INFO L78 Accepts]: Start accepts. Automaton has 1841 states and 2960 transitions. Word has length 144 [2022-11-19 08:26:59,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:26:59,365 INFO L495 AbstractCegarLoop]: Abstraction has 1841 states and 2960 transitions. [2022-11-19 08:26:59,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2022-11-19 08:26:59,366 INFO L276 IsEmpty]: Start isEmpty. Operand 1841 states and 2960 transitions. [2022-11-19 08:26:59,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:26:59,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:26:59,372 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:26:59,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:26:59,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 08:26:59,580 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:26:59,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:26:59,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1090574195, now seen corresponding path program 1 times [2022-11-19 08:26:59,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:26:59,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046619043] [2022-11-19 08:26:59,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:59,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:26:59,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:26:59,860 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:26:59,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:26:59,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046619043] [2022-11-19 08:26:59,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046619043] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:26:59,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094084450] [2022-11-19 08:26:59,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:26:59,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:26:59,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:26:59,864 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:26:59,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:27:00,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:00,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 1129 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:27:00,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:00,385 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-19 08:27:00,389 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:00,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094084450] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:00,391 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:27:00,391 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:27:00,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738575026] [2022-11-19 08:27:00,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:00,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:00,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:00,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:00,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:00,394 INFO L87 Difference]: Start difference. First operand 1841 states and 2960 transitions. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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) [2022-11-19 08:27:00,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:00,903 INFO L93 Difference]: Finished difference Result 5480 states and 9072 transitions. [2022-11-19 08:27:00,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:00,904 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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 144 [2022-11-19 08:27:00,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:00,928 INFO L225 Difference]: With dead ends: 5480 [2022-11-19 08:27:00,929 INFO L226 Difference]: Without dead ends: 3645 [2022-11-19 08:27:00,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:00,939 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 264 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:00,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:27:00,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3645 states. [2022-11-19 08:27:01,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3645 to 3631. [2022-11-19 08:27:01,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3631 states, 3076 states have (on average 1.52925877763329) internal successors, (4704), 3090 states have internal predecessors, (4704), 434 states have call successors, (434), 121 states have call predecessors, (434), 120 states have return successors, (680), 420 states have call predecessors, (680), 432 states have call successors, (680) [2022-11-19 08:27:01,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3631 states to 3631 states and 5818 transitions. [2022-11-19 08:27:01,332 INFO L78 Accepts]: Start accepts. Automaton has 3631 states and 5818 transitions. Word has length 144 [2022-11-19 08:27:01,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:01,333 INFO L495 AbstractCegarLoop]: Abstraction has 3631 states and 5818 transitions. [2022-11-19 08:27:01,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 2 states have internal predecessors, (110), 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) [2022-11-19 08:27:01,334 INFO L276 IsEmpty]: Start isEmpty. Operand 3631 states and 5818 transitions. [2022-11-19 08:27:01,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:27:01,344 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:01,345 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:01,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:01,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-19 08:27:01,553 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:01,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:01,554 INFO L85 PathProgramCache]: Analyzing trace with hash -1171630833, now seen corresponding path program 1 times [2022-11-19 08:27:01,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:01,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012884771] [2022-11-19 08:27:01,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:01,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:01,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:01,777 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:27:01,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:01,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012884771] [2022-11-19 08:27:01,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012884771] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:27:01,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549483374] [2022-11-19 08:27:01,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:01,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:01,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:01,784 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:01,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:27:02,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:02,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:27:02,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:02,253 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:27:02,253 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:02,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [549483374] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:02,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:27:02,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:27:02,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887056796] [2022-11-19 08:27:02,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:02,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:02,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:02,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:02,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:02,256 INFO L87 Difference]: Start difference. First operand 3631 states and 5818 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 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) [2022-11-19 08:27:03,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:03,044 INFO L93 Difference]: Finished difference Result 10820 states and 17839 transitions. [2022-11-19 08:27:03,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:03,045 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 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 144 [2022-11-19 08:27:03,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:03,095 INFO L225 Difference]: With dead ends: 10820 [2022-11-19 08:27:03,095 INFO L226 Difference]: Without dead ends: 7195 [2022-11-19 08:27:03,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:03,115 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 255 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:03,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [255 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:27:03,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7195 states. [2022-11-19 08:27:03,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7195 to 7171. [2022-11-19 08:27:03,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7171 states, 6088 states have (on average 1.5249671484888305) internal successors, (9284), 6114 states have internal predecessors, (9284), 842 states have call successors, (842), 241 states have call predecessors, (842), 240 states have return successors, (1320), 816 states have call predecessors, (1320), 840 states have call successors, (1320) [2022-11-19 08:27:03,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7171 states to 7171 states and 11446 transitions. [2022-11-19 08:27:03,753 INFO L78 Accepts]: Start accepts. Automaton has 7171 states and 11446 transitions. Word has length 144 [2022-11-19 08:27:03,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:03,754 INFO L495 AbstractCegarLoop]: Abstraction has 7171 states and 11446 transitions. [2022-11-19 08:27:03,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 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) [2022-11-19 08:27:03,754 INFO L276 IsEmpty]: Start isEmpty. Operand 7171 states and 11446 transitions. [2022-11-19 08:27:03,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:27:03,767 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:03,767 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:03,779 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:03,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:03,975 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:03,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:03,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1767681613, now seen corresponding path program 1 times [2022-11-19 08:27:03,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:03,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60370097] [2022-11-19 08:27:03,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:03,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:04,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:04,268 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:27:04,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:04,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60370097] [2022-11-19 08:27:04,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60370097] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:27:04,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684954453] [2022-11-19 08:27:04,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:04,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:04,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:04,272 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:04,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:27:04,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:04,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 1117 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:27:04,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:04,648 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 08:27:04,648 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:04,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684954453] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:04,649 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:27:04,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:27:04,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589341604] [2022-11-19 08:27:04,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:04,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:04,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:04,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:04,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:04,651 INFO L87 Difference]: Start difference. First operand 7171 states and 11446 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) [2022-11-19 08:27:05,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:05,970 INFO L93 Difference]: Finished difference Result 21380 states and 35091 transitions. [2022-11-19 08:27:05,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:05,971 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 144 [2022-11-19 08:27:05,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:06,102 INFO L225 Difference]: With dead ends: 21380 [2022-11-19 08:27:06,103 INFO L226 Difference]: Without dead ends: 14215 [2022-11-19 08:27:06,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:06,150 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 276 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:06,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:27:06,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14215 states. [2022-11-19 08:27:07,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14215 to 14171. [2022-11-19 08:27:07,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14171 states, 12052 states have (on average 1.5204115499502158) internal successors, (18324), 12102 states have internal predecessors, (18324), 1638 states have call successors, (1638), 481 states have call predecessors, (1638), 480 states have return successors, (2564), 1588 states have call predecessors, (2564), 1636 states have call successors, (2564) [2022-11-19 08:27:07,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14171 states to 14171 states and 22526 transitions. [2022-11-19 08:27:07,590 INFO L78 Accepts]: Start accepts. Automaton has 14171 states and 22526 transitions. Word has length 144 [2022-11-19 08:27:07,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:07,591 INFO L495 AbstractCegarLoop]: Abstraction has 14171 states and 22526 transitions. [2022-11-19 08:27:07,592 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) [2022-11-19 08:27:07,592 INFO L276 IsEmpty]: Start isEmpty. Operand 14171 states and 22526 transitions. [2022-11-19 08:27:07,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:27:07,620 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:07,620 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:07,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:07,828 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:07,828 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:07,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:07,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1615910961, now seen corresponding path program 1 times [2022-11-19 08:27:07,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:07,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [848650627] [2022-11-19 08:27:07,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:07,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:07,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:08,071 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:27:08,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:08,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [848650627] [2022-11-19 08:27:08,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [848650627] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:27:08,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012564121] [2022-11-19 08:27:08,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:08,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:08,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:08,074 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:08,101 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:27:08,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:08,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 1111 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:27:08,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:08,500 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-19 08:27:08,500 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:08,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012564121] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:08,501 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:27:08,501 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:27:08,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297525916] [2022-11-19 08:27:08,501 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:08,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:08,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:08,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:08,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:08,504 INFO L87 Difference]: Start difference. First operand 14171 states and 22526 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) [2022-11-19 08:27:10,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:10,810 INFO L93 Difference]: Finished difference Result 42260 states and 69031 transitions. [2022-11-19 08:27:10,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:10,811 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 144 [2022-11-19 08:27:10,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:11,051 INFO L225 Difference]: With dead ends: 42260 [2022-11-19 08:27:11,051 INFO L226 Difference]: Without dead ends: 28095 [2022-11-19 08:27:11,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:11,123 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 282 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:11,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [282 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:27:11,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28095 states. [2022-11-19 08:27:14,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28095 to 28011. [2022-11-19 08:27:14,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28011 states, 23860 states have (on average 1.515674769488684) internal successors, (36164), 23958 states have internal predecessors, (36164), 3190 states have call successors, (3190), 961 states have call predecessors, (3190), 960 states have return successors, (4980), 3092 states have call predecessors, (4980), 3188 states have call successors, (4980) [2022-11-19 08:27:14,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28011 states to 28011 states and 44334 transitions. [2022-11-19 08:27:14,214 INFO L78 Accepts]: Start accepts. Automaton has 28011 states and 44334 transitions. Word has length 144 [2022-11-19 08:27:14,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:14,214 INFO L495 AbstractCegarLoop]: Abstraction has 28011 states and 44334 transitions. [2022-11-19 08:27:14,215 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) [2022-11-19 08:27:14,215 INFO L276 IsEmpty]: Start isEmpty. Operand 28011 states and 44334 transitions. [2022-11-19 08:27:14,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:27:14,267 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:14,267 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:14,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:14,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-19 08:27:14,476 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:14,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:14,477 INFO L85 PathProgramCache]: Analyzing trace with hash -9635887, now seen corresponding path program 1 times [2022-11-19 08:27:14,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:14,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008429140] [2022-11-19 08:27:14,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:14,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:14,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:14,703 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:27:14,703 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:14,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008429140] [2022-11-19 08:27:14,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008429140] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:27:14,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434127560] [2022-11-19 08:27:14,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:14,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:14,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:14,706 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:14,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:27:15,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:15,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 1105 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:27:15,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:15,104 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-11-19 08:27:15,104 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:15,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434127560] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:15,104 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:27:15,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:27:15,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229855528] [2022-11-19 08:27:15,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:15,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:15,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:15,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:15,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:15,107 INFO L87 Difference]: Start difference. First operand 28011 states and 44334 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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) [2022-11-19 08:27:18,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:18,657 INFO L93 Difference]: Finished difference Result 83540 states and 135783 transitions. [2022-11-19 08:27:18,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:18,658 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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 144 [2022-11-19 08:27:18,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:19,043 INFO L225 Difference]: With dead ends: 83540 [2022-11-19 08:27:19,043 INFO L226 Difference]: Without dead ends: 55535 [2022-11-19 08:27:19,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:19,208 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 270 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:19,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [270 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:27:19,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55535 states. [2022-11-19 08:27:22,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55535 to 55371. [2022-11-19 08:27:23,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55371 states, 47236 states have (on average 1.510796849860276) internal successors, (71364), 47430 states have internal predecessors, (71364), 6214 states have call successors, (6214), 1921 states have call predecessors, (6214), 1920 states have return successors, (9668), 6020 states have call predecessors, (9668), 6212 states have call successors, (9668) [2022-11-19 08:27:23,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55371 states to 55371 states and 87246 transitions. [2022-11-19 08:27:23,450 INFO L78 Accepts]: Start accepts. Automaton has 55371 states and 87246 transitions. Word has length 144 [2022-11-19 08:27:23,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:23,451 INFO L495 AbstractCegarLoop]: Abstraction has 55371 states and 87246 transitions. [2022-11-19 08:27:23,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 2 states have internal predecessors, (104), 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) [2022-11-19 08:27:23,452 INFO L276 IsEmpty]: Start isEmpty. Operand 55371 states and 87246 transitions. [2022-11-19 08:27:23,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:27:23,524 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:23,524 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:23,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:23,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:23,732 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:23,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:23,732 INFO L85 PathProgramCache]: Analyzing trace with hash 493959891, now seen corresponding path program 1 times [2022-11-19 08:27:23,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:23,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905615770] [2022-11-19 08:27:23,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:23,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:23,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:23,949 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:27:23,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:23,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905615770] [2022-11-19 08:27:23,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905615770] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:27:23,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851722977] [2022-11-19 08:27:23,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:23,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:27:23,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:27:23,952 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:27:23,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:27:24,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:24,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 1099 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:27:24,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:27:24,320 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 08:27:24,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:27:24,321 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851722977] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:24,321 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:27:24,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:27:24,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539264708] [2022-11-19 08:27:24,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:24,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:27:24,322 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:24,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:27:24,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:24,323 INFO L87 Difference]: Start difference. First operand 55371 states and 87246 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2022-11-19 08:27:30,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:27:30,561 INFO L93 Difference]: Finished difference Result 165140 states and 267031 transitions. [2022-11-19 08:27:30,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:27:30,562 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 144 [2022-11-19 08:27:30,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:27:31,298 INFO L225 Difference]: With dead ends: 165140 [2022-11-19 08:27:31,299 INFO L226 Difference]: Without dead ends: 109775 [2022-11-19 08:27:31,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:31,567 INFO L413 NwaCegarLoop]: 279 mSDtfsCounter, 261 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:27:31,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [261 Valid, 527 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 08:27:31,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109775 states. [2022-11-19 08:27:38,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109775 to 109451. [2022-11-19 08:27:38,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109451 states, 93508 states have (on average 1.505796295504128) internal successors, (140804), 93894 states have internal predecessors, (140804), 12102 states have call successors, (12102), 3841 states have call predecessors, (12102), 3840 states have return successors, (18756), 11716 states have call predecessors, (18756), 12100 states have call successors, (18756) [2022-11-19 08:27:39,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109451 states to 109451 states and 171662 transitions. [2022-11-19 08:27:39,902 INFO L78 Accepts]: Start accepts. Automaton has 109451 states and 171662 transitions. Word has length 144 [2022-11-19 08:27:39,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:27:39,904 INFO L495 AbstractCegarLoop]: Abstraction has 109451 states and 171662 transitions. [2022-11-19 08:27:39,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2022-11-19 08:27:39,905 INFO L276 IsEmpty]: Start isEmpty. Operand 109451 states and 171662 transitions. [2022-11-19 08:27:40,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 08:27:40,053 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:27:40,053 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:27:40,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:27:40,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a8d25320-c844-4772-a23d-aea9b5dc20bf/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 08:27:40,262 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:27:40,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:27:40,262 INFO L85 PathProgramCache]: Analyzing trace with hash -109105775, now seen corresponding path program 1 times [2022-11-19 08:27:40,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:27:40,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544616690] [2022-11-19 08:27:40,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:27:40,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:27:40,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:27:41,106 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-19 08:27:41,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:27:41,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544616690] [2022-11-19 08:27:41,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544616690] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:27:41,107 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:27:41,108 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:27:41,108 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379501094] [2022-11-19 08:27:41,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:27:41,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:27:41,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:27:41,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:27:41,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:27:41,110 INFO L87 Difference]: Start difference. First operand 109451 states and 171662 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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)