./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/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 bd466f23ab481babcc03c4173983e1af9100c535496f2e2f8c8fc18a8aaf4174 --- 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 08:29:16,330 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 08:29:16,333 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 08:29:16,361 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 08:29:16,361 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 08:29:16,362 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 08:29:16,364 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 08:29:16,365 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 08:29:16,367 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 08:29:16,368 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 08:29:16,369 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 08:29:16,370 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 08:29:16,371 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 08:29:16,372 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 08:29:16,373 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 08:29:16,374 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 08:29:16,375 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 08:29:16,376 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 08:29:16,378 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 08:29:16,380 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 08:29:16,382 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 08:29:16,385 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 08:29:16,386 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 08:29:16,387 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 08:29:16,391 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 08:29:16,392 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 08:29:16,392 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 08:29:16,393 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 08:29:16,394 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 08:29:16,395 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 08:29:16,395 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 08:29:16,396 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 08:29:16,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 08:29:16,398 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 08:29:16,399 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 08:29:16,399 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 08:29:16,400 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 08:29:16,400 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 08:29:16,401 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 08:29:16,402 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 08:29:16,402 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 08:29:16,403 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 08:29:16,429 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 08:29:16,429 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 08:29:16,430 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 08:29:16,430 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 08:29:16,431 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 08:29:16,431 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 08:29:16,431 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 08:29:16,432 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 08:29:16,432 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 08:29:16,432 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 08:29:16,432 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 08:29:16,433 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 08:29:16,433 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 08:29:16,433 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 08:29:16,433 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 08:29:16,434 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 08:29:16,434 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 08:29:16,434 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 08:29:16,435 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 08:29:16,436 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 08:29:16,436 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 08:29:16,436 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 08:29:16,436 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 08:29:16,437 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 08:29:16,437 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 08:29:16,444 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 08:29:16,445 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 08:29:16,445 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 08:29:16,445 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 08:29:16,445 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 08:29:16,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 08:29:16,446 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 08:29:16,446 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:29:16,446 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 08:29:16,447 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 08:29:16,447 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 08:29:16,447 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 08:29:16,447 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 08:29:16,448 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 08:29:16,448 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 08:29:16,448 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 08:29:16,448 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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd466f23ab481babcc03c4173983e1af9100c535496f2e2f8c8fc18a8aaf4174 [2022-11-19 08:29:16,769 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 08:29:16,804 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 08:29:16,808 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 08:29:16,810 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 08:29:16,811 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 08:29:16,812 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c [2022-11-19 08:29:16,899 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/data/31ec73f60/706d810700404b4c8390fa6499b7fe6a/FLAG4f65be1c8 [2022-11-19 08:29:17,482 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 08:29:17,483 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c [2022-11-19 08:29:17,500 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/data/31ec73f60/706d810700404b4c8390fa6499b7fe6a/FLAG4f65be1c8 [2022-11-19 08:29:17,790 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/data/31ec73f60/706d810700404b4c8390fa6499b7fe6a [2022-11-19 08:29:17,794 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 08:29:17,795 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 08:29:17,797 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 08:29:17,798 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 08:29:17,802 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 08:29:17,803 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:29:17" (1/1) ... [2022-11-19 08:29:17,805 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fbe3476 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:17, skipping insertion in model container [2022-11-19 08:29:17,805 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 08:29:17" (1/1) ... [2022-11-19 08:29:17,815 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 08:29:17,892 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 08:29:18,124 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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c[911,924] [2022-11-19 08:29:18,245 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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c[8416,8429] [2022-11-19 08:29:18,354 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:29:18,374 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 08:29:18,395 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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c[911,924] [2022-11-19 08:29:18,438 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_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/sv-benchmarks/c/combinations/pc_sfifo_3.cil+token_ring.04.cil-2.c[8416,8429] [2022-11-19 08:29:18,476 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 08:29:18,504 INFO L208 MainTranslator]: Completed translation [2022-11-19 08:29:18,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18 WrapperNode [2022-11-19 08:29:18,505 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 08:29:18,506 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 08:29:18,506 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 08:29:18,506 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 08:29:18,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,526 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,563 INFO L138 Inliner]: procedures = 63, calls = 74, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 619 [2022-11-19 08:29:18,563 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 08:29:18,564 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 08:29:18,564 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 08:29:18,564 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 08:29:18,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,577 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,582 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,595 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,628 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,631 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,633 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,650 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 08:29:18,651 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 08:29:18,652 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 08:29:18,652 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 08:29:18,653 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (1/1) ... [2022-11-19 08:29:18,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 08:29:18,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:18,693 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 08:29:18,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 08:29:18,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 08:29:18,741 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-19 08:29:18,741 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-19 08:29:18,742 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-11-19 08:29:18,742 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-11-19 08:29:18,742 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-11-19 08:29:18,742 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-11-19 08:29:18,742 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-11-19 08:29:18,743 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-11-19 08:29:18,743 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-11-19 08:29:18,743 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-11-19 08:29:18,743 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-11-19 08:29:18,743 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-11-19 08:29:18,744 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-11-19 08:29:18,744 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-11-19 08:29:18,744 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-11-19 08:29:18,744 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-11-19 08:29:18,744 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-11-19 08:29:18,745 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-11-19 08:29:18,745 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-11-19 08:29:18,745 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-11-19 08:29:18,745 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-11-19 08:29:18,745 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-11-19 08:29:18,746 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 08:29:18,746 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-11-19 08:29:18,746 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-11-19 08:29:18,746 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-11-19 08:29:18,748 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-11-19 08:29:18,749 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 08:29:18,749 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 08:29:18,749 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-11-19 08:29:18,749 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-11-19 08:29:18,749 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-11-19 08:29:18,749 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-11-19 08:29:18,888 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 08:29:18,891 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 08:29:19,668 INFO L769 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##56: assume !(1 == ~q_free~0); [2022-11-19 08:29:19,668 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 08:29:19,762 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 08:29:20,136 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 08:29:20,137 INFO L300 CfgBuilder]: Removed 11 assume(true) statements. [2022-11-19 08:29:20,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:29:20 BoogieIcfgContainer [2022-11-19 08:29:20,142 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 08:29:20,147 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 08:29:20,148 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 08:29:20,152 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 08:29:20,153 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 08:29:17" (1/3) ... [2022-11-19 08:29:20,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@294167e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:29:20, skipping insertion in model container [2022-11-19 08:29:20,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 08:29:18" (2/3) ... [2022-11-19 08:29:20,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@294167e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 08:29:20, skipping insertion in model container [2022-11-19 08:29:20,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 08:29:20" (3/3) ... [2022-11-19 08:29:20,158 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_3.cil+token_ring.04.cil-2.c [2022-11-19 08:29:20,180 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 08:29:20,181 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-11-19 08:29:20,282 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 08:29:20,292 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;@61b10fb4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 08:29:20,293 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-11-19 08:29:20,299 INFO L276 IsEmpty]: Start isEmpty. Operand has 185 states, 131 states have (on average 1.5190839694656488) internal successors, (199), 139 states have internal predecessors, (199), 36 states have call successors, (36), 15 states have call predecessors, (36), 15 states have return successors, (36), 34 states have call predecessors, (36), 36 states have call successors, (36) [2022-11-19 08:29:20,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 08:29:20,318 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:20,318 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 08:29:20,319 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:20,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:20,328 INFO L85 PathProgramCache]: Analyzing trace with hash 2053978739, now seen corresponding path program 1 times [2022-11-19 08:29:20,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:20,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80022046] [2022-11-19 08:29:20,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:20,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:20,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:20,694 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 08:29:20,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:20,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80022046] [2022-11-19 08:29:20,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80022046] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:20,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:20,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-19 08:29:20,699 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934936621] [2022-11-19 08:29:20,700 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:20,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:29:20,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:20,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:29:20,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 08:29:20,755 INFO L87 Difference]: Start difference. First operand has 185 states, 131 states have (on average 1.5190839694656488) internal successors, (199), 139 states have internal predecessors, (199), 36 states have call successors, (36), 15 states have call predecessors, (36), 15 states have return successors, (36), 34 states have call predecessors, (36), 36 states have call successors, (36) 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 08:29:21,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:21,239 INFO L93 Difference]: Finished difference Result 492 states and 720 transitions. [2022-11-19 08:29:21,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 08:29:21,243 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 08:29:21,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:21,268 INFO L225 Difference]: With dead ends: 492 [2022-11-19 08:29:21,269 INFO L226 Difference]: Without dead ends: 308 [2022-11-19 08:29:21,274 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 08:29:21,277 INFO L413 NwaCegarLoop]: 283 mSDtfsCounter, 321 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 321 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:21,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [321 Valid, 494 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 08:29:21,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2022-11-19 08:29:21,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 297. [2022-11-19 08:29:21,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 212 states have (on average 1.4103773584905661) internal successors, (299), 217 states have internal predecessors, (299), 56 states have call successors, (56), 29 states have call predecessors, (56), 27 states have return successors, (55), 52 states have call predecessors, (55), 52 states have call successors, (55) [2022-11-19 08:29:21,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 410 transitions. [2022-11-19 08:29:21,372 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 410 transitions. Word has length 44 [2022-11-19 08:29:21,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:21,372 INFO L495 AbstractCegarLoop]: Abstraction has 297 states and 410 transitions. [2022-11-19 08:29:21,373 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 08:29:21,373 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 410 transitions. [2022-11-19 08:29:21,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-19 08:29:21,399 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:21,399 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 08:29:21,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 08:29:21,400 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:21,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:21,401 INFO L85 PathProgramCache]: Analyzing trace with hash 780827535, now seen corresponding path program 1 times [2022-11-19 08:29:21,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:21,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997797503] [2022-11-19 08:29:21,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:21,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:21,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:21,676 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 08:29:21,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:21,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997797503] [2022-11-19 08:29:21,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997797503] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:21,683 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:21,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:29:21,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887552411] [2022-11-19 08:29:21,684 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:21,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:29:21,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:21,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:29:21,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:21,693 INFO L87 Difference]: Start difference. First operand 297 states and 410 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 08:29:22,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:22,691 INFO L93 Difference]: Finished difference Result 834 states and 1133 transitions. [2022-11-19 08:29:22,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:29:22,692 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 08:29:22,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:22,701 INFO L225 Difference]: With dead ends: 834 [2022-11-19 08:29:22,701 INFO L226 Difference]: Without dead ends: 368 [2022-11-19 08:29:22,709 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 08:29:22,711 INFO L413 NwaCegarLoop]: 354 mSDtfsCounter, 730 mSDsluCounter, 536 mSDsCounter, 0 mSdLazyCounter, 712 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 739 SdHoareTripleChecker+Valid, 890 SdHoareTripleChecker+Invalid, 980 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 712 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:22,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [739 Valid, 890 Invalid, 980 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 712 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 08:29:22,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-11-19 08:29:22,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 283. [2022-11-19 08:29:22,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 198 states have (on average 1.3434343434343434) internal successors, (266), 203 states have internal predecessors, (266), 56 states have call successors, (56), 29 states have call predecessors, (56), 27 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2022-11-19 08:29:22,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 374 transitions. [2022-11-19 08:29:22,795 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 374 transitions. Word has length 45 [2022-11-19 08:29:22,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:22,796 INFO L495 AbstractCegarLoop]: Abstraction has 283 states and 374 transitions. [2022-11-19 08:29:22,796 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 08:29:22,796 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 374 transitions. [2022-11-19 08:29:22,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-19 08:29:22,807 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:22,807 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 08:29:22,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 08:29:22,808 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:22,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:22,814 INFO L85 PathProgramCache]: Analyzing trace with hash 800242454, now seen corresponding path program 1 times [2022-11-19 08:29:22,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:22,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658469179] [2022-11-19 08:29:22,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:22,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:22,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:23,004 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 08:29:23,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:23,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658469179] [2022-11-19 08:29:23,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658469179] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:23,005 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:23,005 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 08:29:23,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212595843] [2022-11-19 08:29:23,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:23,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:29:23,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:23,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:29:23,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:23,007 INFO L87 Difference]: Start difference. First operand 283 states and 374 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 08:29:23,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:23,864 INFO L93 Difference]: Finished difference Result 749 states and 982 transitions. [2022-11-19 08:29:23,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 08:29:23,864 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 08:29:23,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:23,869 INFO L225 Difference]: With dead ends: 749 [2022-11-19 08:29:23,870 INFO L226 Difference]: Without dead ends: 572 [2022-11-19 08:29:23,871 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 08:29:23,872 INFO L413 NwaCegarLoop]: 343 mSDtfsCounter, 638 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 603 mSolverCounterSat, 267 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 647 SdHoareTripleChecker+Valid, 843 SdHoareTripleChecker+Invalid, 870 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 267 IncrementalHoareTripleChecker+Valid, 603 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:23,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [647 Valid, 843 Invalid, 870 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [267 Valid, 603 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:29:23,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2022-11-19 08:29:23,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 547. [2022-11-19 08:29:23,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 547 states, 379 states have (on average 1.279683377308707) internal successors, (485), 384 states have internal predecessors, (485), 105 states have call successors, (105), 63 states have call predecessors, (105), 61 states have return successors, (118), 101 states have call predecessors, (118), 101 states have call successors, (118) [2022-11-19 08:29:23,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 547 states to 547 states and 708 transitions. [2022-11-19 08:29:23,962 INFO L78 Accepts]: Start accepts. Automaton has 547 states and 708 transitions. Word has length 46 [2022-11-19 08:29:23,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:23,963 INFO L495 AbstractCegarLoop]: Abstraction has 547 states and 708 transitions. [2022-11-19 08:29:23,963 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 08:29:23,963 INFO L276 IsEmpty]: Start isEmpty. Operand 547 states and 708 transitions. [2022-11-19 08:29:23,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 08:29:23,965 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:23,965 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 08:29:23,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 08:29:23,966 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:23,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:23,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1132900461, now seen corresponding path program 1 times [2022-11-19 08:29:23,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:23,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538759629] [2022-11-19 08:29:23,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:23,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:23,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:24,078 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 08:29:24,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:24,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538759629] [2022-11-19 08:29:24,079 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538759629] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:24,079 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:24,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 08:29:24,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928829775] [2022-11-19 08:29:24,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:24,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 08:29:24,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:24,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 08:29:24,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 08:29:24,081 INFO L87 Difference]: Start difference. First operand 547 states and 708 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 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 08:29:24,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:24,935 INFO L93 Difference]: Finished difference Result 995 states and 1407 transitions. [2022-11-19 08:29:24,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 08:29:24,936 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 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 44 [2022-11-19 08:29:24,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:24,943 INFO L225 Difference]: With dead ends: 995 [2022-11-19 08:29:24,943 INFO L226 Difference]: Without dead ends: 897 [2022-11-19 08:29:24,944 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 08:29:24,946 INFO L413 NwaCegarLoop]: 351 mSDtfsCounter, 719 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 728 SdHoareTripleChecker+Valid, 778 SdHoareTripleChecker+Invalid, 644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:24,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [728 Valid, 778 Invalid, 644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 08:29:24,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 897 states. [2022-11-19 08:29:25,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 897 to 884. [2022-11-19 08:29:25,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 884 states, 639 states have (on average 1.3474178403755868) internal successors, (861), 647 states have internal predecessors, (861), 158 states have call successors, (158), 87 states have call predecessors, (158), 85 states have return successors, (201), 151 states have call predecessors, (201), 154 states have call successors, (201) [2022-11-19 08:29:25,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 884 states to 884 states and 1220 transitions. [2022-11-19 08:29:25,075 INFO L78 Accepts]: Start accepts. Automaton has 884 states and 1220 transitions. Word has length 44 [2022-11-19 08:29:25,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:25,076 INFO L495 AbstractCegarLoop]: Abstraction has 884 states and 1220 transitions. [2022-11-19 08:29:25,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 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 08:29:25,076 INFO L276 IsEmpty]: Start isEmpty. Operand 884 states and 1220 transitions. [2022-11-19 08:29:25,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 08:29:25,078 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:25,078 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 08:29:25,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-19 08:29:25,079 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:25,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:25,079 INFO L85 PathProgramCache]: Analyzing trace with hash 1719462938, now seen corresponding path program 1 times [2022-11-19 08:29:25,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:25,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840106859] [2022-11-19 08:29:25,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:25,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:25,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:25,140 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 08:29:25,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:25,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840106859] [2022-11-19 08:29:25,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840106859] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:25,141 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:25,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:29:25,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818474346] [2022-11-19 08:29:25,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:25,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:25,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:25,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:25,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:29:25,146 INFO L87 Difference]: Start difference. First operand 884 states and 1220 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 08:29:25,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:25,310 INFO L93 Difference]: Finished difference Result 885 states and 1221 transitions. [2022-11-19 08:29:25,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:25,311 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 08:29:25,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:25,317 INFO L225 Difference]: With dead ends: 885 [2022-11-19 08:29:25,317 INFO L226 Difference]: Without dead ends: 441 [2022-11-19 08:29:25,319 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 08:29:25,322 INFO L413 NwaCegarLoop]: 195 mSDtfsCounter, 218 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:25,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [218 Valid, 195 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:25,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2022-11-19 08:29:25,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2022-11-19 08:29:25,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 337 states have (on average 1.4510385756676558) internal successors, (489), 342 states have internal predecessors, (489), 73 states have call successors, (73), 31 states have call predecessors, (73), 30 states have return successors, (101), 68 states have call predecessors, (101), 71 states have call successors, (101) [2022-11-19 08:29:25,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 663 transitions. [2022-11-19 08:29:25,388 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 663 transitions. Word has length 50 [2022-11-19 08:29:25,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:25,388 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 663 transitions. [2022-11-19 08:29:25,388 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 08:29:25,389 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 663 transitions. [2022-11-19 08:29:25,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-19 08:29:25,391 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:25,391 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 08:29:25,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-19 08:29:25,392 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:25,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:25,392 INFO L85 PathProgramCache]: Analyzing trace with hash -169442519, now seen corresponding path program 1 times [2022-11-19 08:29:25,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:25,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266475238] [2022-11-19 08:29:25,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:25,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:25,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:25,532 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:29:25,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:25,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266475238] [2022-11-19 08:29:25,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266475238] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:25,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500036974] [2022-11-19 08:29:25,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:25,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:25,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:25,537 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:25,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 08:29:25,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:25,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 511 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:29:25,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-19 08:29:25,818 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:25,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500036974] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:25,818 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:25,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:29:25,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417662308] [2022-11-19 08:29:25,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:25,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:25,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:25,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:25,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:25,821 INFO L87 Difference]: Start difference. First operand 441 states and 663 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 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 08:29:26,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:26,000 INFO L93 Difference]: Finished difference Result 1295 states and 1999 transitions. [2022-11-19 08:29:26,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:26,001 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 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 81 [2022-11-19 08:29:26,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:26,006 INFO L225 Difference]: With dead ends: 1295 [2022-11-19 08:29:26,007 INFO L226 Difference]: Without dead ends: 860 [2022-11-19 08:29:26,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 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 08:29:26,012 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 123 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:26,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 248 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2022-11-19 08:29:26,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 851. [2022-11-19 08:29:26,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 851 states, 655 states have (on average 1.4412213740458015) internal successors, (944), 663 states have internal predecessors, (944), 135 states have call successors, (135), 61 states have call predecessors, (135), 60 states have return successors, (189), 127 states have call predecessors, (189), 133 states have call successors, (189) [2022-11-19 08:29:26,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 851 states to 851 states and 1268 transitions. [2022-11-19 08:29:26,100 INFO L78 Accepts]: Start accepts. Automaton has 851 states and 1268 transitions. Word has length 81 [2022-11-19 08:29:26,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:26,101 INFO L495 AbstractCegarLoop]: Abstraction has 851 states and 1268 transitions. [2022-11-19 08:29:26,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 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 08:29:26,101 INFO L276 IsEmpty]: Start isEmpty. Operand 851 states and 1268 transitions. [2022-11-19 08:29:26,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-19 08:29:26,104 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:26,104 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 08:29:26,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:26,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-11-19 08:29:26,311 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:26,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:26,311 INFO L85 PathProgramCache]: Analyzing trace with hash 550650633, now seen corresponding path program 1 times [2022-11-19 08:29:26,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:26,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566680432] [2022-11-19 08:29:26,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:26,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:26,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:26,526 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-19 08:29:26,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:26,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566680432] [2022-11-19 08:29:26,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566680432] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:26,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713854225] [2022-11-19 08:29:26,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:26,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:26,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:26,529 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:26,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 08:29:26,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:26,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:29:26,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:26,837 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:29:26,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:26,839 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713854225] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:26,840 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:26,840 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-19 08:29:26,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140243536] [2022-11-19 08:29:26,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:26,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:26,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:26,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:26,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:26,846 INFO L87 Difference]: Start difference. First operand 851 states and 1268 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 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 08:29:27,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:27,109 INFO L93 Difference]: Finished difference Result 2510 states and 3834 transitions. [2022-11-19 08:29:27,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:27,110 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 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 81 [2022-11-19 08:29:27,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:27,123 INFO L225 Difference]: With dead ends: 2510 [2022-11-19 08:29:27,123 INFO L226 Difference]: Without dead ends: 1665 [2022-11-19 08:29:27,130 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 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 08:29:27,131 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 120 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:27,132 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 248 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:27,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1665 states. [2022-11-19 08:29:27,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1665 to 1651. [2022-11-19 08:29:27,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1651 states, 1276 states have (on average 1.4294670846394983) internal successors, (1824), 1290 states have internal predecessors, (1824), 254 states have call successors, (254), 121 states have call predecessors, (254), 120 states have return successors, (356), 240 states have call predecessors, (356), 252 states have call successors, (356) [2022-11-19 08:29:27,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1651 states to 1651 states and 2434 transitions. [2022-11-19 08:29:27,318 INFO L78 Accepts]: Start accepts. Automaton has 1651 states and 2434 transitions. Word has length 81 [2022-11-19 08:29:27,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:27,318 INFO L495 AbstractCegarLoop]: Abstraction has 1651 states and 2434 transitions. [2022-11-19 08:29:27,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 2 states have internal predecessors, (56), 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 08:29:27,319 INFO L276 IsEmpty]: Start isEmpty. Operand 1651 states and 2434 transitions. [2022-11-19 08:29:27,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-11-19 08:29:27,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:27,324 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 08:29:27,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:27,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:27,530 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:27,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:27,531 INFO L85 PathProgramCache]: Analyzing trace with hash 1646366505, now seen corresponding path program 1 times [2022-11-19 08:29:27,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:27,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227259237] [2022-11-19 08:29:27,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:27,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:27,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:27,622 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-19 08:29:27,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:27,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227259237] [2022-11-19 08:29:27,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1227259237] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:27,623 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:27,623 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:29:27,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889442908] [2022-11-19 08:29:27,623 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:27,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:27,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:27,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:27,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:29:27,625 INFO L87 Difference]: Start difference. First operand 1651 states and 2434 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-19 08:29:27,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:27,914 INFO L93 Difference]: Finished difference Result 3351 states and 5049 transitions. [2022-11-19 08:29:27,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:27,914 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 81 [2022-11-19 08:29:27,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:27,931 INFO L225 Difference]: With dead ends: 3351 [2022-11-19 08:29:27,931 INFO L226 Difference]: Without dead ends: 2027 [2022-11-19 08:29:27,936 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 08:29:27,937 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 56 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:27,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 309 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:27,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2027 states. [2022-11-19 08:29:28,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2027 to 1855. [2022-11-19 08:29:28,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1855 states, 1464 states have (on average 1.4617486338797814) internal successors, (2140), 1478 states have internal predecessors, (2140), 262 states have call successors, (262), 129 states have call predecessors, (262), 128 states have return successors, (364), 248 states have call predecessors, (364), 260 states have call successors, (364) [2022-11-19 08:29:28,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1855 states to 1855 states and 2766 transitions. [2022-11-19 08:29:28,159 INFO L78 Accepts]: Start accepts. Automaton has 1855 states and 2766 transitions. Word has length 81 [2022-11-19 08:29:28,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:28,160 INFO L495 AbstractCegarLoop]: Abstraction has 1855 states and 2766 transitions. [2022-11-19 08:29:28,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-19 08:29:28,160 INFO L276 IsEmpty]: Start isEmpty. Operand 1855 states and 2766 transitions. [2022-11-19 08:29:28,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-11-19 08:29:28,175 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:28,175 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:28,175 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-19 08:29:28,176 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:28,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:28,176 INFO L85 PathProgramCache]: Analyzing trace with hash -1208159555, now seen corresponding path program 1 times [2022-11-19 08:29:28,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:28,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534451487] [2022-11-19 08:29:28,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:28,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:28,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:28,299 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-19 08:29:28,299 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:28,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534451487] [2022-11-19 08:29:28,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534451487] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:28,300 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 08:29:28,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 08:29:28,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798112001] [2022-11-19 08:29:28,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:28,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:28,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:28,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:28,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 08:29:28,302 INFO L87 Difference]: Start difference. First operand 1855 states and 2766 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:29:28,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:28,791 INFO L93 Difference]: Finished difference Result 5464 states and 8303 transitions. [2022-11-19 08:29:28,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:28,792 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 107 [2022-11-19 08:29:28,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:28,826 INFO L225 Difference]: With dead ends: 5464 [2022-11-19 08:29:28,826 INFO L226 Difference]: Without dead ends: 3615 [2022-11-19 08:29:28,835 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 08:29:28,837 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 119 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:28,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 250 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:28,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3615 states. [2022-11-19 08:29:29,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3615 to 3583. [2022-11-19 08:29:29,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3583 states, 2828 states have (on average 1.4441301272984441) internal successors, (4084), 2854 states have internal predecessors, (4084), 498 states have call successors, (498), 257 states have call predecessors, (498), 256 states have return successors, (688), 472 states have call predecessors, (688), 496 states have call successors, (688) [2022-11-19 08:29:29,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3583 states to 3583 states and 5270 transitions. [2022-11-19 08:29:29,198 INFO L78 Accepts]: Start accepts. Automaton has 3583 states and 5270 transitions. Word has length 107 [2022-11-19 08:29:29,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:29,199 INFO L495 AbstractCegarLoop]: Abstraction has 3583 states and 5270 transitions. [2022-11-19 08:29:29,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:29:29,199 INFO L276 IsEmpty]: Start isEmpty. Operand 3583 states and 5270 transitions. [2022-11-19 08:29:29,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 08:29:29,214 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:29,214 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:29,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-19 08:29:29,214 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:29,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:29,215 INFO L85 PathProgramCache]: Analyzing trace with hash 3161116, now seen corresponding path program 1 times [2022-11-19 08:29:29,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:29,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205467879] [2022-11-19 08:29:29,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:29,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:29,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:29,586 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-19 08:29:29,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:29,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205467879] [2022-11-19 08:29:29,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205467879] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:29,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329123697] [2022-11-19 08:29:29,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:29,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:29,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:29,591 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:29,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 08:29:29,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:29,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:29:29,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:29,838 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-19 08:29:29,838 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:29,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329123697] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:29,838 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:29,839 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-19 08:29:29,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050274094] [2022-11-19 08:29:29,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:29,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:29,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:29,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:29,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:29,841 INFO L87 Difference]: Start difference. First operand 3583 states and 5270 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:30,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:30,273 INFO L93 Difference]: Finished difference Result 6588 states and 9689 transitions. [2022-11-19 08:29:30,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:30,274 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 124 [2022-11-19 08:29:30,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:30,300 INFO L225 Difference]: With dead ends: 6588 [2022-11-19 08:29:30,300 INFO L226 Difference]: Without dead ends: 4468 [2022-11-19 08:29:30,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:30,312 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 127 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:30,313 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 168 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:30,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4468 states. [2022-11-19 08:29:30,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4468 to 4468. [2022-11-19 08:29:30,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4468 states, 3598 states have (on average 1.4002223457476375) internal successors, (5038), 3624 states have internal predecessors, (5038), 535 states have call successors, (535), 334 states have call predecessors, (535), 334 states have return successors, (755), 510 states have call predecessors, (755), 533 states have call successors, (755) [2022-11-19 08:29:30,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4468 states to 4468 states and 6328 transitions. [2022-11-19 08:29:30,985 INFO L78 Accepts]: Start accepts. Automaton has 4468 states and 6328 transitions. Word has length 124 [2022-11-19 08:29:30,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:30,986 INFO L495 AbstractCegarLoop]: Abstraction has 4468 states and 6328 transitions. [2022-11-19 08:29:30,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:30,986 INFO L276 IsEmpty]: Start isEmpty. Operand 4468 states and 6328 transitions. [2022-11-19 08:29:31,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 08:29:31,001 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:31,002 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:31,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 08:29:31,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:31,214 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:31,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:31,215 INFO L85 PathProgramCache]: Analyzing trace with hash -53983109, now seen corresponding path program 2 times [2022-11-19 08:29:31,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:31,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915213005] [2022-11-19 08:29:31,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:31,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:31,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:31,539 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-19 08:29:31,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:31,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915213005] [2022-11-19 08:29:31,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915213005] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:31,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746199745] [2022-11-19 08:29:31,540 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:29:31,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:31,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:31,541 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:31,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 08:29:31,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-19 08:29:31,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:29:31,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 08:29:31,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:31,794 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:29:31,795 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:31,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746199745] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:31,795 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:31,795 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-19 08:29:31,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735175118] [2022-11-19 08:29:31,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:31,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:31,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:31,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:31,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:31,798 INFO L87 Difference]: Start difference. First operand 4468 states and 6328 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:32,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:32,415 INFO L93 Difference]: Finished difference Result 9035 states and 13147 transitions. [2022-11-19 08:29:32,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:32,416 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 124 [2022-11-19 08:29:32,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:32,457 INFO L225 Difference]: With dead ends: 9035 [2022-11-19 08:29:32,457 INFO L226 Difference]: Without dead ends: 6376 [2022-11-19 08:29:32,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:32,475 INFO L413 NwaCegarLoop]: 237 mSDtfsCounter, 111 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:32,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 353 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:32,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6376 states. [2022-11-19 08:29:33,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6376 to 6252. [2022-11-19 08:29:33,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6252 states, 5043 states have (on average 1.3934166170930002) internal successors, (7027), 5077 states have internal predecessors, (7027), 741 states have call successors, (741), 468 states have call predecessors, (741), 467 states have return successors, (1156), 707 states have call predecessors, (1156), 739 states have call successors, (1156) [2022-11-19 08:29:33,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6252 states to 6252 states and 8924 transitions. [2022-11-19 08:29:33,302 INFO L78 Accepts]: Start accepts. Automaton has 6252 states and 8924 transitions. Word has length 124 [2022-11-19 08:29:33,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:33,302 INFO L495 AbstractCegarLoop]: Abstraction has 6252 states and 8924 transitions. [2022-11-19 08:29:33,304 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:33,304 INFO L276 IsEmpty]: Start isEmpty. Operand 6252 states and 8924 transitions. [2022-11-19 08:29:33,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-19 08:29:33,324 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:33,324 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-19 08:29:33,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:33,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:33,531 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:33,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:33,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1337401619, now seen corresponding path program 1 times [2022-11-19 08:29:33,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:33,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409193042] [2022-11-19 08:29:33,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:33,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:33,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:33,946 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-19 08:29:33,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:33,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409193042] [2022-11-19 08:29:33,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409193042] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:33,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029835048] [2022-11-19 08:29:33,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:33,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:33,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:33,951 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:33,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 08:29:34,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:34,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 08:29:34,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:34,228 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-19 08:29:34,228 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:34,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029835048] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:34,229 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:34,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-19 08:29:34,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950691321] [2022-11-19 08:29:34,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:34,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:34,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:34,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:34,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:34,234 INFO L87 Difference]: Start difference. First operand 6252 states and 8924 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:35,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:35,176 INFO L93 Difference]: Finished difference Result 14744 states and 21404 transitions. [2022-11-19 08:29:35,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:35,177 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 121 [2022-11-19 08:29:35,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:35,260 INFO L225 Difference]: With dead ends: 14744 [2022-11-19 08:29:35,260 INFO L226 Difference]: Without dead ends: 8499 [2022-11-19 08:29:35,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:35,288 INFO L413 NwaCegarLoop]: 146 mSDtfsCounter, 68 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:35,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 258 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:35,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8499 states. [2022-11-19 08:29:36,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8499 to 7004. [2022-11-19 08:29:36,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7004 states, 5727 states have (on average 1.423258250392876) internal successors, (8151), 5762 states have internal predecessors, (8151), 775 states have call successors, (775), 502 states have call predecessors, (775), 501 states have return successors, (1190), 740 states have call predecessors, (1190), 773 states have call successors, (1190) [2022-11-19 08:29:36,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7004 states to 7004 states and 10116 transitions. [2022-11-19 08:29:36,114 INFO L78 Accepts]: Start accepts. Automaton has 7004 states and 10116 transitions. Word has length 121 [2022-11-19 08:29:36,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:36,115 INFO L495 AbstractCegarLoop]: Abstraction has 7004 states and 10116 transitions. [2022-11-19 08:29:36,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:36,116 INFO L276 IsEmpty]: Start isEmpty. Operand 7004 states and 10116 transitions. [2022-11-19 08:29:36,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-19 08:29:36,133 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:36,133 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-19 08:29:36,143 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-19 08:29:36,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 08:29:36,346 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:36,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:36,346 INFO L85 PathProgramCache]: Analyzing trace with hash -1870162676, now seen corresponding path program 2 times [2022-11-19 08:29:36,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:36,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404153782] [2022-11-19 08:29:36,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:36,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:36,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:36,485 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-11-19 08:29:36,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404153782] [2022-11-19 08:29:36,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404153782] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521381201] [2022-11-19 08:29:36,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:29:36,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:36,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:36,488 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:36,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 08:29:36,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:29:36,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:29:36,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:29:36,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:36,738 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-19 08:29:36,738 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:36,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521381201] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:36,739 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:36,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-19 08:29:36,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321280835] [2022-11-19 08:29:36,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:36,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:36,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:36,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:36,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:36,741 INFO L87 Difference]: Start difference. First operand 7004 states and 10116 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:29:37,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:37,610 INFO L93 Difference]: Finished difference Result 13107 states and 19233 transitions. [2022-11-19 08:29:37,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:37,611 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2022-11-19 08:29:37,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:37,655 INFO L225 Difference]: With dead ends: 13107 [2022-11-19 08:29:37,655 INFO L226 Difference]: Without dead ends: 9519 [2022-11-19 08:29:37,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:37,672 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 83 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:37,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 337 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:37,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9519 states. [2022-11-19 08:29:38,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9519 to 8148. [2022-11-19 08:29:38,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8148 states, 6759 states have (on average 1.4539133007841396) internal successors, (9827), 6794 states have internal predecessors, (9827), 831 states have call successors, (831), 558 states have call predecessors, (831), 557 states have return successors, (1246), 796 states have call predecessors, (1246), 829 states have call successors, (1246) [2022-11-19 08:29:38,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8148 states to 8148 states and 11904 transitions. [2022-11-19 08:29:38,847 INFO L78 Accepts]: Start accepts. Automaton has 8148 states and 11904 transitions. Word has length 121 [2022-11-19 08:29:38,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:38,848 INFO L495 AbstractCegarLoop]: Abstraction has 8148 states and 11904 transitions. [2022-11-19 08:29:38,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:29:38,848 INFO L276 IsEmpty]: Start isEmpty. Operand 8148 states and 11904 transitions. [2022-11-19 08:29:38,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-19 08:29:38,873 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:38,874 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-19 08:29:38,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:39,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 08:29:39,081 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:39,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:39,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1532611280, now seen corresponding path program 1 times [2022-11-19 08:29:39,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:39,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686913807] [2022-11-19 08:29:39,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:39,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:39,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:39,267 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-11-19 08:29:39,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:39,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686913807] [2022-11-19 08:29:39,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686913807] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:39,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322050990] [2022-11-19 08:29:39,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:39,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:39,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:39,271 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:39,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 08:29:39,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:39,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 655 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:29:39,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:39,527 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-19 08:29:39,527 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:39,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322050990] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:39,528 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:39,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-19 08:29:39,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794254422] [2022-11-19 08:29:39,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:39,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:39,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:39,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:39,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:39,530 INFO L87 Difference]: Start difference. First operand 8148 states and 11904 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:29:40,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:40,487 INFO L93 Difference]: Finished difference Result 15507 states and 22921 transitions. [2022-11-19 08:29:40,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:40,488 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2022-11-19 08:29:40,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:40,543 INFO L225 Difference]: With dead ends: 15507 [2022-11-19 08:29:40,544 INFO L226 Difference]: Without dead ends: 11333 [2022-11-19 08:29:40,560 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:40,561 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 89 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:40,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 342 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:40,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11333 states. [2022-11-19 08:29:41,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11333 to 9766. [2022-11-19 08:29:41,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9766 states, 8209 states have (on average 1.479473748325009) internal successors, (12145), 8244 states have internal predecessors, (12145), 915 states have call successors, (915), 642 states have call predecessors, (915), 641 states have return successors, (1330), 880 states have call predecessors, (1330), 913 states have call successors, (1330) [2022-11-19 08:29:41,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9766 states to 9766 states and 14390 transitions. [2022-11-19 08:29:41,372 INFO L78 Accepts]: Start accepts. Automaton has 9766 states and 14390 transitions. Word has length 121 [2022-11-19 08:29:41,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:41,373 INFO L495 AbstractCegarLoop]: Abstraction has 9766 states and 14390 transitions. [2022-11-19 08:29:41,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:29:41,374 INFO L276 IsEmpty]: Start isEmpty. Operand 9766 states and 14390 transitions. [2022-11-19 08:29:41,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-19 08:29:41,393 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:41,393 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-19 08:29:41,439 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:41,599 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:41,600 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:41,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:41,600 INFO L85 PathProgramCache]: Analyzing trace with hash -824348484, now seen corresponding path program 1 times [2022-11-19 08:29:41,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:41,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625382555] [2022-11-19 08:29:41,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:41,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:41,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:41,732 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-19 08:29:41,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:41,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625382555] [2022-11-19 08:29:41,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625382555] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:41,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686058613] [2022-11-19 08:29:41,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:41,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:41,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:41,734 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:41,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 08:29:41,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:41,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-19 08:29:41,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:41,962 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-19 08:29:41,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:41,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686058613] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:41,963 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:41,963 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-19 08:29:41,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948303881] [2022-11-19 08:29:41,963 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:41,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:41,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:41,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:41,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:41,965 INFO L87 Difference]: Start difference. First operand 9766 states and 14390 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:29:42,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:42,919 INFO L93 Difference]: Finished difference Result 18351 states and 27431 transitions. [2022-11-19 08:29:42,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:42,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2022-11-19 08:29:42,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:42,981 INFO L225 Difference]: With dead ends: 18351 [2022-11-19 08:29:42,981 INFO L226 Difference]: Without dead ends: 13284 [2022-11-19 08:29:43,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:29:43,005 INFO L413 NwaCegarLoop]: 203 mSDtfsCounter, 77 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:43,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 332 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:43,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13284 states. [2022-11-19 08:29:43,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13284 to 12109. [2022-11-19 08:29:44,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12109 states, 10300 states have (on average 1.5003883495145631) internal successors, (15454), 10335 states have internal predecessors, (15454), 1041 states have call successors, (1041), 768 states have call predecessors, (1041), 767 states have return successors, (1456), 1006 states have call predecessors, (1456), 1039 states have call successors, (1456) [2022-11-19 08:29:44,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12109 states to 12109 states and 17951 transitions. [2022-11-19 08:29:44,047 INFO L78 Accepts]: Start accepts. Automaton has 12109 states and 17951 transitions. Word has length 121 [2022-11-19 08:29:44,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:44,047 INFO L495 AbstractCegarLoop]: Abstraction has 12109 states and 17951 transitions. [2022-11-19 08:29:44,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2022-11-19 08:29:44,048 INFO L276 IsEmpty]: Start isEmpty. Operand 12109 states and 17951 transitions. [2022-11-19 08:29:44,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-11-19 08:29:44,076 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:44,076 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:44,088 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:44,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 08:29:44,283 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:44,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:44,283 INFO L85 PathProgramCache]: Analyzing trace with hash 1344700566, now seen corresponding path program 1 times [2022-11-19 08:29:44,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:44,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417982220] [2022-11-19 08:29:44,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:44,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:44,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:44,554 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-19 08:29:44,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:44,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417982220] [2022-11-19 08:29:44,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417982220] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:44,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977144723] [2022-11-19 08:29:44,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:44,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:44,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:44,556 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:44,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 08:29:44,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:44,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-19 08:29:44,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:44,841 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-19 08:29:44,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:44,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [977144723] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:44,841 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:44,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2022-11-19 08:29:44,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093371747] [2022-11-19 08:29:44,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:44,844 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 08:29:44,844 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:44,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 08:29:44,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-19 08:29:44,845 INFO L87 Difference]: Start difference. First operand 12109 states and 17951 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-19 08:29:47,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:47,587 INFO L93 Difference]: Finished difference Result 35541 states and 52502 transitions. [2022-11-19 08:29:47,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 08:29:47,588 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 126 [2022-11-19 08:29:47,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:47,717 INFO L225 Difference]: With dead ends: 35541 [2022-11-19 08:29:47,717 INFO L226 Difference]: Without dead ends: 23439 [2022-11-19 08:29:47,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-19 08:29:47,761 INFO L413 NwaCegarLoop]: 249 mSDtfsCounter, 136 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:47,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [136 Valid, 599 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:47,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23439 states. [2022-11-19 08:29:49,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23439 to 23415. [2022-11-19 08:29:49,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23415 states, 19810 states have (on average 1.465522463402322) internal successors, (29032), 19894 states have internal predecessors, (29032), 2057 states have call successors, (2057), 1532 states have call predecessors, (2057), 1547 states have return successors, (3072), 1989 states have call predecessors, (3072), 2055 states have call successors, (3072) [2022-11-19 08:29:49,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23415 states to 23415 states and 34161 transitions. [2022-11-19 08:29:49,583 INFO L78 Accepts]: Start accepts. Automaton has 23415 states and 34161 transitions. Word has length 126 [2022-11-19 08:29:49,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:49,584 INFO L495 AbstractCegarLoop]: Abstraction has 23415 states and 34161 transitions. [2022-11-19 08:29:49,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-19 08:29:49,584 INFO L276 IsEmpty]: Start isEmpty. Operand 23415 states and 34161 transitions. [2022-11-19 08:29:49,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-11-19 08:29:49,653 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:49,653 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:49,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:49,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 08:29:49,860 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:49,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:49,861 INFO L85 PathProgramCache]: Analyzing trace with hash 772896477, now seen corresponding path program 1 times [2022-11-19 08:29:49,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:49,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773653427] [2022-11-19 08:29:49,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:49,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:49,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:50,147 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 13 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-19 08:29:50,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:50,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773653427] [2022-11-19 08:29:50,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773653427] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:50,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093427787] [2022-11-19 08:29:50,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:50,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:50,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:50,150 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:50,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 08:29:50,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:50,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 08:29:50,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:50,513 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 48 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2022-11-19 08:29:50,514 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:50,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2093427787] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:50,514 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:50,515 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2022-11-19 08:29:50,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612831338] [2022-11-19 08:29:50,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:50,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:29:50,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:50,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:29:50,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:50,517 INFO L87 Difference]: Start difference. First operand 23415 states and 34161 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:29:52,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:52,547 INFO L93 Difference]: Finished difference Result 39253 states and 57012 transitions. [2022-11-19 08:29:52,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:29:52,548 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2022-11-19 08:29:52,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:52,609 INFO L225 Difference]: With dead ends: 39253 [2022-11-19 08:29:52,609 INFO L226 Difference]: Without dead ends: 15845 [2022-11-19 08:29:52,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-19 08:29:52,655 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 367 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:52,656 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [380 Valid, 356 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:29:52,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15845 states. [2022-11-19 08:29:53,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15845 to 15586. [2022-11-19 08:29:53,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15586 states, 13226 states have (on average 1.4601542416452442) internal successors, (19312), 13285 states have internal predecessors, (19312), 1338 states have call successors, (1338), 990 states have call predecessors, (1338), 1021 states have return successors, (1852), 1311 states have call predecessors, (1852), 1336 states have call successors, (1852) [2022-11-19 08:29:54,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15586 states to 15586 states and 22502 transitions. [2022-11-19 08:29:54,024 INFO L78 Accepts]: Start accepts. Automaton has 15586 states and 22502 transitions. Word has length 126 [2022-11-19 08:29:54,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:54,025 INFO L495 AbstractCegarLoop]: Abstraction has 15586 states and 22502 transitions. [2022-11-19 08:29:54,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:29:54,025 INFO L276 IsEmpty]: Start isEmpty. Operand 15586 states and 22502 transitions. [2022-11-19 08:29:54,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-19 08:29:54,051 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:54,051 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:54,063 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:54,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 08:29:54,258 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:54,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:54,259 INFO L85 PathProgramCache]: Analyzing trace with hash -188091765, now seen corresponding path program 2 times [2022-11-19 08:29:54,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:54,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797826100] [2022-11-19 08:29:54,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:54,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:54,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:54,617 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-11-19 08:29:54,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:54,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797826100] [2022-11-19 08:29:54,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797826100] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:54,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669776203] [2022-11-19 08:29:54,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:29:54,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:54,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:54,638 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:54,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 08:29:54,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 08:29:54,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:29:54,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-19 08:29:54,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:54,869 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-19 08:29:54,870 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:54,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669776203] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:54,870 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:54,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-19 08:29:54,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365362182] [2022-11-19 08:29:54,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:54,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:29:54,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:54,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:29:54,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:54,872 INFO L87 Difference]: Start difference. First operand 15586 states and 22502 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:55,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:29:55,898 INFO L93 Difference]: Finished difference Result 22144 states and 32026 transitions. [2022-11-19 08:29:55,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:29:55,899 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 127 [2022-11-19 08:29:55,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:29:55,962 INFO L225 Difference]: With dead ends: 22144 [2022-11-19 08:29:55,962 INFO L226 Difference]: Without dead ends: 15306 [2022-11-19 08:29:55,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:55,984 INFO L413 NwaCegarLoop]: 141 mSDtfsCounter, 28 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:29:55,985 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 262 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:29:56,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15306 states. [2022-11-19 08:29:57,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15306 to 15306. [2022-11-19 08:29:57,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15306 states, 12978 states have (on average 1.4627831715210355) internal successors, (18984), 13029 states have internal predecessors, (18984), 1338 states have call successors, (1338), 990 states have call predecessors, (1338), 989 states have return successors, (1804), 1287 states have call predecessors, (1804), 1336 states have call successors, (1804) [2022-11-19 08:29:57,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15306 states to 15306 states and 22126 transitions. [2022-11-19 08:29:57,627 INFO L78 Accepts]: Start accepts. Automaton has 15306 states and 22126 transitions. Word has length 127 [2022-11-19 08:29:57,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:29:57,627 INFO L495 AbstractCegarLoop]: Abstraction has 15306 states and 22126 transitions. [2022-11-19 08:29:57,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:29:57,627 INFO L276 IsEmpty]: Start isEmpty. Operand 15306 states and 22126 transitions. [2022-11-19 08:29:57,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-11-19 08:29:57,651 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:29:57,651 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:29:57,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 08:29:57,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 08:29:57,863 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:29:57,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:29:57,864 INFO L85 PathProgramCache]: Analyzing trace with hash 983350918, now seen corresponding path program 1 times [2022-11-19 08:29:57,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:29:57,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110650940] [2022-11-19 08:29:57,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:57,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:29:57,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:58,209 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-19 08:29:58,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:29:58,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110650940] [2022-11-19 08:29:58,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2110650940] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:29:58,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168654149] [2022-11-19 08:29:58,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:29:58,211 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:29:58,211 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:29:58,213 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:29:58,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 08:29:58,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:29:58,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 08:29:58,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:29:58,537 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-19 08:29:58,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:29:58,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168654149] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:29:58,541 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:29:58,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2022-11-19 08:29:58,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713900091] [2022-11-19 08:29:58,542 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:29:58,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:29:58,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:29:58,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:29:58,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:29:58,545 INFO L87 Difference]: Start difference. First operand 15306 states and 22126 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:30:00,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:30:00,967 INFO L93 Difference]: Finished difference Result 36228 states and 52288 transitions. [2022-11-19 08:30:00,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:30:00,968 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 127 [2022-11-19 08:30:00,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:30:01,030 INFO L225 Difference]: With dead ends: 36228 [2022-11-19 08:30:01,030 INFO L226 Difference]: Without dead ends: 20974 [2022-11-19 08:30:01,062 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-19 08:30:01,062 INFO L413 NwaCegarLoop]: 127 mSDtfsCounter, 468 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:30:01,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [481 Valid, 287 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:30:01,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20974 states. [2022-11-19 08:30:02,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20974 to 20970. [2022-11-19 08:30:02,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20970 states, 17676 states have (on average 1.4383344648110432) internal successors, (25424), 17751 states have internal predecessors, (25424), 1897 states have call successors, (1897), 1397 states have call predecessors, (1897), 1396 states have return successors, (2575), 1822 states have call predecessors, (2575), 1895 states have call successors, (2575) [2022-11-19 08:30:02,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20970 states to 20970 states and 29896 transitions. [2022-11-19 08:30:02,750 INFO L78 Accepts]: Start accepts. Automaton has 20970 states and 29896 transitions. Word has length 127 [2022-11-19 08:30:02,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:30:02,751 INFO L495 AbstractCegarLoop]: Abstraction has 20970 states and 29896 transitions. [2022-11-19 08:30:02,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:30:02,751 INFO L276 IsEmpty]: Start isEmpty. Operand 20970 states and 29896 transitions. [2022-11-19 08:30:02,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-11-19 08:30:02,778 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:30:02,778 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:30:02,787 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-19 08:30:02,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:30:02,985 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:30:02,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:30:02,985 INFO L85 PathProgramCache]: Analyzing trace with hash -327673536, now seen corresponding path program 1 times [2022-11-19 08:30:02,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:30:02,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564807117] [2022-11-19 08:30:02,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:30:02,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:30:03,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:30:03,269 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-19 08:30:03,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:30:03,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564807117] [2022-11-19 08:30:03,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564807117] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:30:03,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1010698274] [2022-11-19 08:30:03,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:30:03,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:30:03,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:30:03,272 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:30:03,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 08:30:03,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:30:03,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 08:30:03,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:30:03,622 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-19 08:30:03,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:30:03,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1010698274] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:30:03,623 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:30:03,623 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2022-11-19 08:30:03,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472275899] [2022-11-19 08:30:03,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:30:03,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:30:03,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:30:03,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:30:03,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:30:03,625 INFO L87 Difference]: Start difference. First operand 20970 states and 29896 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:30:06,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:30:06,445 INFO L93 Difference]: Finished difference Result 49710 states and 70722 transitions. [2022-11-19 08:30:06,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:30:06,446 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2022-11-19 08:30:06,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:30:06,533 INFO L225 Difference]: With dead ends: 49710 [2022-11-19 08:30:06,533 INFO L226 Difference]: Without dead ends: 28792 [2022-11-19 08:30:06,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-19 08:30:06,581 INFO L413 NwaCegarLoop]: 131 mSDtfsCounter, 364 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:30:06,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [377 Valid, 353 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:30:06,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28792 states. [2022-11-19 08:30:09,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28792 to 28788. [2022-11-19 08:30:10,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28788 states, 24115 states have (on average 1.4131038772548206) internal successors, (34077), 24226 states have internal predecessors, (34077), 2696 states have call successors, (2696), 1977 states have call predecessors, (2696), 1976 states have return successors, (3679), 2585 states have call predecessors, (3679), 2694 states have call successors, (3679) [2022-11-19 08:30:10,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28788 states to 28788 states and 40452 transitions. [2022-11-19 08:30:10,113 INFO L78 Accepts]: Start accepts. Automaton has 28788 states and 40452 transitions. Word has length 129 [2022-11-19 08:30:10,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:30:10,114 INFO L495 AbstractCegarLoop]: Abstraction has 28788 states and 40452 transitions. [2022-11-19 08:30:10,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:30:10,114 INFO L276 IsEmpty]: Start isEmpty. Operand 28788 states and 40452 transitions. [2022-11-19 08:30:10,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-11-19 08:30:10,173 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:30:10,174 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:30:10,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 08:30:10,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:30:10,380 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:30:10,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:30:10,381 INFO L85 PathProgramCache]: Analyzing trace with hash 305083984, now seen corresponding path program 1 times [2022-11-19 08:30:10,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:30:10,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361094860] [2022-11-19 08:30:10,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:30:10,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:30:10,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:30:10,730 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-19 08:30:10,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:30:10,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361094860] [2022-11-19 08:30:10,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361094860] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:30:10,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747468965] [2022-11-19 08:30:10,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:30:10,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:30:10,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:30:10,733 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:30:10,765 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 08:30:10,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:30:10,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-19 08:30:10,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:30:11,238 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-19 08:30:11,238 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:30:11,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747468965] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:30:11,239 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:30:11,239 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2022-11-19 08:30:11,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262477683] [2022-11-19 08:30:11,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:30:11,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 08:30:11,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:30:11,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 08:30:11,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-19 08:30:11,241 INFO L87 Difference]: Start difference. First operand 28788 states and 40452 transitions. Second operand has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:30:14,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:30:14,954 INFO L93 Difference]: Finished difference Result 68446 states and 95997 transitions. [2022-11-19 08:30:14,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 08:30:14,955 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 129 [2022-11-19 08:30:14,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:30:15,073 INFO L225 Difference]: With dead ends: 68446 [2022-11-19 08:30:15,074 INFO L226 Difference]: Without dead ends: 39710 [2022-11-19 08:30:15,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 131 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-19 08:30:15,116 INFO L413 NwaCegarLoop]: 131 mSDtfsCounter, 431 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 444 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 08:30:15,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [444 Valid, 293 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 08:30:15,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39710 states. [2022-11-19 08:30:19,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39710 to 39706. [2022-11-19 08:30:19,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39706 states, 33064 states have (on average 1.3891846116622308) internal successors, (45932), 33229 states have internal predecessors, (45932), 3838 states have call successors, (3838), 2804 states have call predecessors, (3838), 2803 states have return successors, (5257), 3673 states have call predecessors, (5257), 3836 states have call successors, (5257) [2022-11-19 08:30:19,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39706 states to 39706 states and 55027 transitions. [2022-11-19 08:30:19,420 INFO L78 Accepts]: Start accepts. Automaton has 39706 states and 55027 transitions. Word has length 129 [2022-11-19 08:30:19,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:30:19,420 INFO L495 AbstractCegarLoop]: Abstraction has 39706 states and 55027 transitions. [2022-11-19 08:30:19,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.2) internal successors, (86), 6 states have internal predecessors, (86), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-11-19 08:30:19,420 INFO L276 IsEmpty]: Start isEmpty. Operand 39706 states and 55027 transitions. [2022-11-19 08:30:19,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-19 08:30:19,457 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:30:19,457 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:30:19,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 08:30:19,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:30:19,663 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 08:30:19,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:30:19,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1955489542, now seen corresponding path program 1 times [2022-11-19 08:30:19,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:30:19,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361362434] [2022-11-19 08:30:19,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:30:19,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:30:19,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:30:19,899 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 13 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-19 08:30:19,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:30:19,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361362434] [2022-11-19 08:30:19,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361362434] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:30:19,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613050720] [2022-11-19 08:30:19,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:30:19,900 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:30:19,900 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:30:19,902 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:30:19,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b6b09372-7c13-4754-a3a2-90f8c2f11ec6/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 08:30:20,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:30:20,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 716 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 08:30:20,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:30:20,216 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-19 08:30:20,216 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-19 08:30:20,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613050720] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 08:30:20,217 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-19 08:30:20,217 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2022-11-19 08:30:20,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260986284] [2022-11-19 08:30:20,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 08:30:20,218 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 08:30:20,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:30:20,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 08:30:20,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-19 08:30:20,219 INFO L87 Difference]: Start difference. First operand 39706 states and 55027 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-19 08:30:25,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:30:25,166 INFO L93 Difference]: Finished difference Result 73151 states and 102906 transitions. [2022-11-19 08:30:25,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 08:30:25,169 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 131 [2022-11-19 08:30:25,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:30:25,285 INFO L225 Difference]: With dead ends: 73151 [2022-11-19 08:30:25,285 INFO L226 Difference]: Without dead ends: 45121 [2022-11-19 08:30:25,328 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 133 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 08:30:25,329 INFO L413 NwaCegarLoop]: 143 mSDtfsCounter, 100 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:30:25,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 179 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 08:30:25,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45121 states.