./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.04.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a 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_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.04.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI --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 05d3b7d21cc48825b4a0189c75f03d768acc6241312029d3e223c1b9b2a509ea --- 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-5e519f3 [2022-11-03 03:50:19,483 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 03:50:19,486 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 03:50:19,530 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 03:50:19,530 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 03:50:19,531 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 03:50:19,533 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 03:50:19,535 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 03:50:19,537 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 03:50:19,539 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 03:50:19,540 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 03:50:19,541 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 03:50:19,542 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 03:50:19,543 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 03:50:19,544 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 03:50:19,546 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 03:50:19,547 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 03:50:19,548 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 03:50:19,558 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 03:50:19,560 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 03:50:19,562 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 03:50:19,570 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 03:50:19,572 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 03:50:19,573 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 03:50:19,577 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 03:50:19,578 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 03:50:19,578 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 03:50:19,579 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 03:50:19,580 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 03:50:19,581 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 03:50:19,582 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 03:50:19,593 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 03:50:19,594 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 03:50:19,595 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 03:50:19,596 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 03:50:19,597 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 03:50:19,598 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 03:50:19,598 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 03:50:19,598 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 03:50:19,599 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 03:50:19,600 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 03:50:19,602 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 03:50:19,657 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 03:50:19,657 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 03:50:19,657 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 03:50:19,658 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 03:50:19,658 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 03:50:19,659 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 03:50:19,659 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 03:50:19,659 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 03:50:19,659 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 03:50:19,660 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 03:50:19,660 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 03:50:19,660 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 03:50:19,660 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 03:50:19,660 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 03:50:19,661 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 03:50:19,661 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 03:50:19,661 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 03:50:19,661 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 03:50:19,662 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 03:50:19,663 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 03:50:19,663 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 03:50:19,663 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 03:50:19,663 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 03:50:19,663 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 03:50:19,664 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 03:50:19,664 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 03:50:19,664 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 03:50:19,664 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 03:50:19,664 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 03:50:19,665 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 03:50:19,665 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 03:50:19,665 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 03:50:19,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:50:19,666 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 03:50:19,666 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 03:50:19,666 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 03:50:19,666 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 03:50:19,666 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 03:50:19,667 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 03:50:19,667 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 03:50:19,667 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 03:50:19,667 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_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 05d3b7d21cc48825b4a0189c75f03d768acc6241312029d3e223c1b9b2a509ea [2022-11-03 03:50:19,977 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 03:50:20,017 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 03:50:20,020 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 03:50:20,022 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 03:50:20,023 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 03:50:20,024 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/systemc/token_ring.04.cil-2.c [2022-11-03 03:50:20,112 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/data/ece3a31da/7191487bce8b4f26aea96473a0e8dfd0/FLAGcee8562f3 [2022-11-03 03:50:20,691 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 03:50:20,692 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/sv-benchmarks/c/systemc/token_ring.04.cil-2.c [2022-11-03 03:50:20,711 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/data/ece3a31da/7191487bce8b4f26aea96473a0e8dfd0/FLAGcee8562f3 [2022-11-03 03:50:21,033 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/data/ece3a31da/7191487bce8b4f26aea96473a0e8dfd0 [2022-11-03 03:50:21,037 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 03:50:21,038 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 03:50:21,047 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 03:50:21,047 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 03:50:21,051 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 03:50:21,053 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,055 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d9be35e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21, skipping insertion in model container [2022-11-03 03:50:21,056 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,064 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 03:50:21,107 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 03:50:21,276 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/sv-benchmarks/c/systemc/token_ring.04.cil-2.c[671,684] [2022-11-03 03:50:21,393 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:50:21,409 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 03:50:21,422 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/sv-benchmarks/c/systemc/token_ring.04.cil-2.c[671,684] [2022-11-03 03:50:21,466 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 03:50:21,482 INFO L208 MainTranslator]: Completed translation [2022-11-03 03:50:21,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21 WrapperNode [2022-11-03 03:50:21,482 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 03:50:21,483 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 03:50:21,484 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 03:50:21,484 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 03:50:21,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,531 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,593 INFO L138 Inliner]: procedures = 36, calls = 44, calls flagged for inlining = 19, calls inlined = 19, statements flattened = 394 [2022-11-03 03:50:21,605 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 03:50:21,606 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 03:50:21,606 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 03:50:21,606 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 03:50:21,616 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,617 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,628 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,635 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,642 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,656 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,665 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,666 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,684 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 03:50:21,684 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 03:50:21,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 03:50:21,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 03:50:21,686 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (1/1) ... [2022-11-03 03:50:21,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 03:50:21,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:21,724 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 03:50:21,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 03:50:21,779 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 03:50:21,779 INFO L130 BoogieDeclarations]: Found specification of procedure error [2022-11-03 03:50:21,779 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2022-11-03 03:50:21,779 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2022-11-03 03:50:21,780 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2022-11-03 03:50:21,780 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2022-11-03 03:50:21,780 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2022-11-03 03:50:21,780 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-11-03 03:50:21,780 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-11-03 03:50:21,781 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2022-11-03 03:50:21,781 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2022-11-03 03:50:21,782 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2022-11-03 03:50:21,782 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2022-11-03 03:50:21,782 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 03:50:21,782 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2022-11-03 03:50:21,783 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2022-11-03 03:50:21,783 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 03:50:21,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 03:50:21,932 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 03:50:21,936 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 03:50:22,579 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 03:50:22,858 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 03:50:22,858 INFO L300 CfgBuilder]: Removed 7 assume(true) statements. [2022-11-03 03:50:22,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:50:22 BoogieIcfgContainer [2022-11-03 03:50:22,862 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 03:50:22,865 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 03:50:22,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 03:50:22,870 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 03:50:22,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 03:50:21" (1/3) ... [2022-11-03 03:50:22,871 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aac75c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:50:22, skipping insertion in model container [2022-11-03 03:50:22,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 03:50:21" (2/3) ... [2022-11-03 03:50:22,872 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1aac75c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 03:50:22, skipping insertion in model container [2022-11-03 03:50:22,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 03:50:22" (3/3) ... [2022-11-03 03:50:22,874 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.04.cil-2.c [2022-11-03 03:50:22,897 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 03:50:22,898 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 03:50:22,959 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 03:50:22,966 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;@6abe4a49, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 03:50:22,966 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 03:50:22,981 INFO L276 IsEmpty]: Start isEmpty. Operand has 106 states, 77 states have (on average 1.5324675324675325) internal successors, (118), 81 states have internal predecessors, (118), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2022-11-03 03:50:22,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-03 03:50:22,993 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:22,993 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] [2022-11-03 03:50:22,994 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:23,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:23,007 INFO L85 PathProgramCache]: Analyzing trace with hash 442892344, now seen corresponding path program 1 times [2022-11-03 03:50:23,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:23,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483720338] [2022-11-03 03:50:23,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:23,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:23,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:23,578 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:50:23,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:23,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483720338] [2022-11-03 03:50:23,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483720338] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:23,581 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:50:23,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-03 03:50:23,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907540246] [2022-11-03 03:50:23,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:23,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:50:23,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:23,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:50:23,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-03 03:50:23,645 INFO L87 Difference]: Start difference. First operand has 106 states, 77 states have (on average 1.5324675324675325) internal successors, (118), 81 states have internal predecessors, (118), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 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) [2022-11-03 03:50:24,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:24,177 INFO L93 Difference]: Finished difference Result 295 states and 448 transitions. [2022-11-03 03:50:24,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-03 03:50:24,179 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 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 43 [2022-11-03 03:50:24,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:24,190 INFO L225 Difference]: With dead ends: 295 [2022-11-03 03:50:24,190 INFO L226 Difference]: Without dead ends: 190 [2022-11-03 03:50:24,194 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 [2022-11-03 03:50:24,198 INFO L413 NwaCegarLoop]: 221 mSDtfsCounter, 256 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:24,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 374 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-03 03:50:24,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2022-11-03 03:50:24,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2022-11-03 03:50:24,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 142 states have (on average 1.4507042253521127) internal successors, (206), 145 states have internal predecessors, (206), 34 states have call successors, (34), 13 states have call predecessors, (34), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2022-11-03 03:50:24,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 272 transitions. [2022-11-03 03:50:24,269 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 272 transitions. Word has length 43 [2022-11-03 03:50:24,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:24,270 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 272 transitions. [2022-11-03 03:50:24,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 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) [2022-11-03 03:50:24,271 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 272 transitions. [2022-11-03 03:50:24,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-03 03:50:24,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:24,275 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] [2022-11-03 03:50:24,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 03:50:24,276 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:24,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:24,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1615707175, now seen corresponding path program 1 times [2022-11-03 03:50:24,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:24,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344233414] [2022-11-03 03:50:24,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:24,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:24,561 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 03:50:24,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:24,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344233414] [2022-11-03 03:50:24,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344233414] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:24,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472916133] [2022-11-03 03:50:24,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:24,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:24,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:24,569 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:24,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 03:50:24,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:24,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:24,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:24,860 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-03 03:50:24,861 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:24,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472916133] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:24,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:24,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 03:50:24,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062396490] [2022-11-03 03:50:24,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:24,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:24,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:24,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:24,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:24,865 INFO L87 Difference]: Start difference. First operand 189 states and 272 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 2 states have internal predecessors, (52), 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) [2022-11-03 03:50:25,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:25,008 INFO L93 Difference]: Finished difference Result 550 states and 803 transitions. [2022-11-03 03:50:25,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:25,008 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 2 states have internal predecessors, (52), 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 80 [2022-11-03 03:50:25,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:25,017 INFO L225 Difference]: With dead ends: 550 [2022-11-03 03:50:25,017 INFO L226 Difference]: Without dead ends: 366 [2022-11-03 03:50:25,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:25,021 INFO L413 NwaCegarLoop]: 166 mSDtfsCounter, 123 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:25,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 279 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:25,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2022-11-03 03:50:25,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 360. [2022-11-03 03:50:25,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 275 states have (on average 1.4436363636363636) internal successors, (397), 279 states have internal predecessors, (397), 60 states have call successors, (60), 25 states have call predecessors, (60), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2022-11-03 03:50:25,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 515 transitions. [2022-11-03 03:50:25,075 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 515 transitions. Word has length 80 [2022-11-03 03:50:25,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:25,076 INFO L495 AbstractCegarLoop]: Abstraction has 360 states and 515 transitions. [2022-11-03 03:50:25,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 2 states have internal predecessors, (52), 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) [2022-11-03 03:50:25,076 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 515 transitions. [2022-11-03 03:50:25,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-03 03:50:25,081 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:25,081 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] [2022-11-03 03:50:25,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:25,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:25,303 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:25,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:25,304 INFO L85 PathProgramCache]: Analyzing trace with hash -895614023, now seen corresponding path program 1 times [2022-11-03 03:50:25,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:25,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92152756] [2022-11-03 03:50:25,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:25,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:25,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:25,582 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 03:50:25,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:25,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92152756] [2022-11-03 03:50:25,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92152756] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:25,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166053534] [2022-11-03 03:50:25,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:25,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:25,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:25,591 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:25,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 03:50:25,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:25,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:25,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:25,831 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 03:50:25,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:25,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166053534] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:25,835 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:25,835 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2022-11-03 03:50:25,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891407768] [2022-11-03 03:50:25,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:25,836 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:25,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:25,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:25,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:25,838 INFO L87 Difference]: Start difference. First operand 360 states and 515 transitions. Second operand has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 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) [2022-11-03 03:50:25,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:25,993 INFO L93 Difference]: Finished difference Result 1057 states and 1534 transitions. [2022-11-03 03:50:25,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:25,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 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 80 [2022-11-03 03:50:25,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:26,001 INFO L225 Difference]: With dead ends: 1057 [2022-11-03 03:50:26,001 INFO L226 Difference]: Without dead ends: 702 [2022-11-03 03:50:26,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:26,007 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 126 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 248 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 [2022-11-03 03:50:26,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 248 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:26,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2022-11-03 03:50:26,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 694. [2022-11-03 03:50:26,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 694 states, 535 states have (on average 1.4336448598130842) internal successors, (767), 541 states have internal predecessors, (767), 110 states have call successors, (110), 49 states have call predecessors, (110), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2022-11-03 03:50:26,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 985 transitions. [2022-11-03 03:50:26,115 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 985 transitions. Word has length 80 [2022-11-03 03:50:26,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:26,116 INFO L495 AbstractCegarLoop]: Abstraction has 694 states and 985 transitions. [2022-11-03 03:50:26,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.333333333333332) internal successors, (49), 2 states have internal predecessors, (49), 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) [2022-11-03 03:50:26,117 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 985 transitions. [2022-11-03 03:50:26,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-03 03:50:26,130 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:26,131 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] [2022-11-03 03:50:26,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:26,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-11-03 03:50:26,359 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:26,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:26,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1962166311, now seen corresponding path program 1 times [2022-11-03 03:50:26,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:26,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [467110231] [2022-11-03 03:50:26,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:26,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:26,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:26,850 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-11-03 03:50:26,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:26,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [467110231] [2022-11-03 03:50:26,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [467110231] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:26,851 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:50:26,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-03 03:50:26,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116350086] [2022-11-03 03:50:26,851 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:26,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:50:26,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:26,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:50:26,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:26,853 INFO L87 Difference]: Start difference. First operand 694 states and 985 transitions. Second operand has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 03:50:27,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:27,362 INFO L93 Difference]: Finished difference Result 2246 states and 3200 transitions. [2022-11-03 03:50:27,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:50:27,363 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 80 [2022-11-03 03:50:27,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:27,385 INFO L225 Difference]: With dead ends: 2246 [2022-11-03 03:50:27,385 INFO L226 Difference]: Without dead ends: 1558 [2022-11-03 03:50:27,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:50:27,391 INFO L413 NwaCegarLoop]: 149 mSDtfsCounter, 418 mSDsluCounter, 343 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 431 SdHoareTripleChecker+Valid, 435 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:27,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [431 Valid, 435 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:50:27,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1558 states. [2022-11-03 03:50:27,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1558 to 1330. [2022-11-03 03:50:27,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1330 states, 1027 states have (on average 1.4206426484907497) internal successors, (1459), 1037 states have internal predecessors, (1459), 206 states have call successors, (206), 97 states have call predecessors, (206), 96 states have return successors, (204), 196 states have call predecessors, (204), 204 states have call successors, (204) [2022-11-03 03:50:27,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1330 states to 1330 states and 1869 transitions. [2022-11-03 03:50:27,589 INFO L78 Accepts]: Start accepts. Automaton has 1330 states and 1869 transitions. Word has length 80 [2022-11-03 03:50:27,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:27,590 INFO L495 AbstractCegarLoop]: Abstraction has 1330 states and 1869 transitions. [2022-11-03 03:50:27,590 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.666666666666667) internal successors, (46), 6 states have internal predecessors, (46), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-03 03:50:27,591 INFO L276 IsEmpty]: Start isEmpty. Operand 1330 states and 1869 transitions. [2022-11-03 03:50:27,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-03 03:50:27,598 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:27,598 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:27,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-03 03:50:27,604 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:27,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:27,605 INFO L85 PathProgramCache]: Analyzing trace with hash 2145059053, now seen corresponding path program 1 times [2022-11-03 03:50:27,605 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:27,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146688611] [2022-11-03 03:50:27,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:27,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:27,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:27,877 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 10 proven. 17 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 03:50:27,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:27,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146688611] [2022-11-03 03:50:27,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146688611] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:27,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659980554] [2022-11-03 03:50:27,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:27,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:27,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:27,883 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:27,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 03:50:28,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:28,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:28,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:28,136 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-03 03:50:28,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:28,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659980554] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:28,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:28,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:50:28,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134404809] [2022-11-03 03:50:28,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:28,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:28,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:28,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:28,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:28,140 INFO L87 Difference]: Start difference. First operand 1330 states and 1869 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 03:50:28,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:28,361 INFO L93 Difference]: Finished difference Result 2354 states and 3356 transitions. [2022-11-03 03:50:28,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:28,362 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2022-11-03 03:50:28,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:28,372 INFO L225 Difference]: With dead ends: 2354 [2022-11-03 03:50:28,373 INFO L226 Difference]: Without dead ends: 1662 [2022-11-03 03:50:28,375 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:28,376 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 54 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:28,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 309 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:28,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1662 states. [2022-11-03 03:50:28,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1662 to 1522. [2022-11-03 03:50:28,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1522 states, 1203 states have (on average 1.4522028262676643) internal successors, (1747), 1213 states have internal predecessors, (1747), 214 states have call successors, (214), 105 states have call predecessors, (214), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2022-11-03 03:50:28,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1522 states to 1522 states and 2173 transitions. [2022-11-03 03:50:28,510 INFO L78 Accepts]: Start accepts. Automaton has 1522 states and 2173 transitions. Word has length 94 [2022-11-03 03:50:28,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:28,511 INFO L495 AbstractCegarLoop]: Abstraction has 1522 states and 2173 transitions. [2022-11-03 03:50:28,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-11-03 03:50:28,511 INFO L276 IsEmpty]: Start isEmpty. Operand 1522 states and 2173 transitions. [2022-11-03 03:50:28,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-11-03 03:50:28,523 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:28,523 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:28,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:28,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:28,747 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:28,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:28,747 INFO L85 PathProgramCache]: Analyzing trace with hash 411509574, now seen corresponding path program 1 times [2022-11-03 03:50:28,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:28,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219311368] [2022-11-03 03:50:28,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:28,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:28,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:29,080 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:50:29,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:29,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219311368] [2022-11-03 03:50:29,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219311368] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:29,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898221474] [2022-11-03 03:50:29,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:29,084 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:29,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:29,087 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:29,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 03:50:29,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:29,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 598 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:29,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:29,393 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 03:50:29,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:29,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898221474] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:29,394 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:29,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2022-11-03 03:50:29,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320683780] [2022-11-03 03:50:29,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:29,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:29,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:29,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:29,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:29,397 INFO L87 Difference]: Start difference. First operand 1522 states and 2173 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 03:50:29,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:29,697 INFO L93 Difference]: Finished difference Result 4507 states and 6510 transitions. [2022-11-03 03:50:29,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:29,697 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 120 [2022-11-03 03:50:29,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:29,716 INFO L225 Difference]: With dead ends: 4507 [2022-11-03 03:50:29,717 INFO L226 Difference]: Without dead ends: 2990 [2022-11-03 03:50:29,722 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:29,723 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 83 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 248 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 [2022-11-03 03:50:29,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 248 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:29,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2990 states. [2022-11-03 03:50:29,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2990 to 2962. [2022-11-03 03:50:29,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2962 states, 2347 states have (on average 1.43971026842778) internal successors, (3379), 2365 states have internal predecessors, (3379), 406 states have call successors, (406), 209 states have call predecessors, (406), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2022-11-03 03:50:29,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2962 states to 2962 states and 4189 transitions. [2022-11-03 03:50:29,970 INFO L78 Accepts]: Start accepts. Automaton has 2962 states and 4189 transitions. Word has length 120 [2022-11-03 03:50:29,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:29,970 INFO L495 AbstractCegarLoop]: Abstraction has 2962 states and 4189 transitions. [2022-11-03 03:50:29,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 2 states have internal predecessors, (75), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2022-11-03 03:50:29,971 INFO L276 IsEmpty]: Start isEmpty. Operand 2962 states and 4189 transitions. [2022-11-03 03:50:29,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-03 03:50:29,980 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:29,980 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] [2022-11-03 03:50:30,022 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:30,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:30,203 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:30,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:30,203 INFO L85 PathProgramCache]: Analyzing trace with hash 655965401, now seen corresponding path program 1 times [2022-11-03 03:50:30,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:30,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336048835] [2022-11-03 03:50:30,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:30,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:30,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:30,279 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2022-11-03 03:50:30,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:30,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336048835] [2022-11-03 03:50:30,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336048835] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:30,280 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 03:50:30,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-03 03:50:30,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263202382] [2022-11-03 03:50:30,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:30,281 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:30,281 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:30,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:30,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-03 03:50:30,282 INFO L87 Difference]: Start difference. First operand 2962 states and 4189 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2022-11-03 03:50:30,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:30,664 INFO L93 Difference]: Finished difference Result 7391 states and 10518 transitions. [2022-11-03 03:50:30,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:30,665 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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 106 [2022-11-03 03:50:30,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:30,691 INFO L225 Difference]: With dead ends: 7391 [2022-11-03 03:50:30,691 INFO L226 Difference]: Without dead ends: 4434 [2022-11-03 03:50:30,700 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 [2022-11-03 03:50:30,701 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 119 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:30,702 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 278 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:30,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4434 states. [2022-11-03 03:50:31,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4434 to 4406. [2022-11-03 03:50:31,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4406 states, 3495 states have (on average 1.42689556509299) internal successors, (4987), 3521 states have internal predecessors, (4987), 598 states have call successors, (598), 313 states have call predecessors, (598), 312 states have return successors, (596), 572 states have call predecessors, (596), 596 states have call successors, (596) [2022-11-03 03:50:31,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4406 states to 4406 states and 6181 transitions. [2022-11-03 03:50:31,046 INFO L78 Accepts]: Start accepts. Automaton has 4406 states and 6181 transitions. Word has length 106 [2022-11-03 03:50:31,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:31,048 INFO L495 AbstractCegarLoop]: Abstraction has 4406 states and 6181 transitions. [2022-11-03 03:50:31,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2022-11-03 03:50:31,048 INFO L276 IsEmpty]: Start isEmpty. Operand 4406 states and 6181 transitions. [2022-11-03 03:50:31,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 03:50:31,064 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:31,064 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:31,064 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-03 03:50:31,064 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:31,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:31,065 INFO L85 PathProgramCache]: Analyzing trace with hash 462187476, now seen corresponding path program 1 times [2022-11-03 03:50:31,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:31,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47481439] [2022-11-03 03:50:31,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:31,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:31,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:31,378 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-03 03:50:31,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:31,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47481439] [2022-11-03 03:50:31,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47481439] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:31,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493613685] [2022-11-03 03:50:31,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:31,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:31,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:31,380 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:31,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 03:50:31,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:31,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:50:31,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:31,623 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-03 03:50:31,624 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:31,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493613685] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:31,624 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:31,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:50:31,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176889734] [2022-11-03 03:50:31,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:31,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:31,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:31,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:31,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:31,627 INFO L87 Difference]: Start difference. First operand 4406 states and 6181 transitions. Second operand has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 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) [2022-11-03 03:50:31,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:31,996 INFO L93 Difference]: Finished difference Result 7382 states and 10571 transitions. [2022-11-03 03:50:31,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:31,997 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 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 123 [2022-11-03 03:50:31,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:32,022 INFO L225 Difference]: With dead ends: 7382 [2022-11-03 03:50:32,022 INFO L226 Difference]: Without dead ends: 4426 [2022-11-03 03:50:32,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:32,034 INFO L413 NwaCegarLoop]: 202 mSDtfsCounter, 114 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:32,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 317 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:32,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4426 states. [2022-11-03 03:50:32,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4426 to 4390. [2022-11-03 03:50:32,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4390 states, 3479 states have (on average 1.4058637539522851) internal successors, (4891), 3505 states have internal predecessors, (4891), 598 states have call successors, (598), 313 states have call predecessors, (598), 312 states have return successors, (596), 572 states have call predecessors, (596), 596 states have call successors, (596) [2022-11-03 03:50:32,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4390 states to 4390 states and 6085 transitions. [2022-11-03 03:50:32,481 INFO L78 Accepts]: Start accepts. Automaton has 4390 states and 6085 transitions. Word has length 123 [2022-11-03 03:50:32,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:32,481 INFO L495 AbstractCegarLoop]: Abstraction has 4390 states and 6085 transitions. [2022-11-03 03:50:32,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 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) [2022-11-03 03:50:32,482 INFO L276 IsEmpty]: Start isEmpty. Operand 4390 states and 6085 transitions. [2022-11-03 03:50:32,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-03 03:50:32,502 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:32,503 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] [2022-11-03 03:50:32,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:32,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:32,723 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:32,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:32,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1869151402, now seen corresponding path program 1 times [2022-11-03 03:50:32,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:32,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999368193] [2022-11-03 03:50:32,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:32,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:32,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:33,013 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-03 03:50:33,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:33,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999368193] [2022-11-03 03:50:33,013 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999368193] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:33,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142966527] [2022-11-03 03:50:33,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:33,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:33,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:33,016 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:33,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 03:50:33,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:33,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:33,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:33,272 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-03 03:50:33,272 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:33,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142966527] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:33,272 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:33,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:50:33,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730462116] [2022-11-03 03:50:33,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:33,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:33,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:33,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:33,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:33,275 INFO L87 Difference]: Start difference. First operand 4390 states and 6085 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), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:50:33,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:33,630 INFO L93 Difference]: Finished difference Result 8398 states and 11570 transitions. [2022-11-03 03:50:33,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:33,631 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), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 123 [2022-11-03 03:50:33,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:33,661 INFO L225 Difference]: With dead ends: 8398 [2022-11-03 03:50:33,661 INFO L226 Difference]: Without dead ends: 5466 [2022-11-03 03:50:33,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:33,675 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 125 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:33,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 167 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 03:50:33,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5466 states. [2022-11-03 03:50:34,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5466 to 5466. [2022-11-03 03:50:34,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5466 states, 4419 states have (on average 1.3629780493324282) internal successors, (6023), 4445 states have internal predecessors, (6023), 642 states have call successors, (642), 405 states have call predecessors, (642), 404 states have return successors, (640), 616 states have call predecessors, (640), 640 states have call successors, (640) [2022-11-03 03:50:34,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5466 states to 5466 states and 7305 transitions. [2022-11-03 03:50:34,130 INFO L78 Accepts]: Start accepts. Automaton has 5466 states and 7305 transitions. Word has length 123 [2022-11-03 03:50:34,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:34,130 INFO L495 AbstractCegarLoop]: Abstraction has 5466 states and 7305 transitions. [2022-11-03 03:50:34,132 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), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:50:34,132 INFO L276 IsEmpty]: Start isEmpty. Operand 5466 states and 7305 transitions. [2022-11-03 03:50:34,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-03 03:50:34,174 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:34,175 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] [2022-11-03 03:50:34,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:34,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:34,387 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:34,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:34,387 INFO L85 PathProgramCache]: Analyzing trace with hash -716427031, now seen corresponding path program 1 times [2022-11-03 03:50:34,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:34,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637200359] [2022-11-03 03:50:34,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:34,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:34,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:34,633 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 32 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-03 03:50:34,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:34,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637200359] [2022-11-03 03:50:34,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637200359] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:34,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501126496] [2022-11-03 03:50:34,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:34,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:34,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:34,635 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:34,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 03:50:34,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:34,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:50:34,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:34,867 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 03:50:34,867 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:34,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501126496] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:34,868 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:34,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:50:34,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918246469] [2022-11-03 03:50:34,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:34,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:34,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:34,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:34,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:34,872 INFO L87 Difference]: Start difference. First operand 5466 states and 7305 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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) [2022-11-03 03:50:35,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:35,397 INFO L93 Difference]: Finished difference Result 8298 states and 11307 transitions. [2022-11-03 03:50:35,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:35,398 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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 124 [2022-11-03 03:50:35,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:35,449 INFO L225 Difference]: With dead ends: 8298 [2022-11-03 03:50:35,450 INFO L226 Difference]: Without dead ends: 5494 [2022-11-03 03:50:35,461 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 [2022-11-03 03:50:35,462 INFO L413 NwaCegarLoop]: 220 mSDtfsCounter, 110 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:35,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 335 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:35,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5494 states. [2022-11-03 03:50:35,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5494 to 5442. [2022-11-03 03:50:35,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5442 states, 4395 states have (on average 1.3376564277588168) internal successors, (5879), 4421 states have internal predecessors, (5879), 642 states have call successors, (642), 405 states have call predecessors, (642), 404 states have return successors, (640), 616 states have call predecessors, (640), 640 states have call successors, (640) [2022-11-03 03:50:35,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5442 states to 5442 states and 7161 transitions. [2022-11-03 03:50:35,983 INFO L78 Accepts]: Start accepts. Automaton has 5442 states and 7161 transitions. Word has length 124 [2022-11-03 03:50:35,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:35,983 INFO L495 AbstractCegarLoop]: Abstraction has 5442 states and 7161 transitions. [2022-11-03 03:50:35,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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) [2022-11-03 03:50:35,984 INFO L276 IsEmpty]: Start isEmpty. Operand 5442 states and 7161 transitions. [2022-11-03 03:50:36,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-03 03:50:36,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:36,000 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] [2022-11-03 03:50:36,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-03 03:50:36,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-03 03:50:36,223 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:36,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:36,224 INFO L85 PathProgramCache]: Analyzing trace with hash 958630153, now seen corresponding path program 1 times [2022-11-03 03:50:36,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:36,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568612997] [2022-11-03 03:50:36,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:36,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:36,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:36,519 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 10 proven. 30 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-03 03:50:36,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:36,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568612997] [2022-11-03 03:50:36,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568612997] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:36,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513452843] [2022-11-03 03:50:36,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:36,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:36,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:36,523 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:36,545 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-03 03:50:36,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:36,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-03 03:50:36,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:36,799 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:50:36,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:36,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [513452843] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:36,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:36,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2022-11-03 03:50:36,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174064224] [2022-11-03 03:50:36,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:36,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-03 03:50:36,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:36,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-03 03:50:36,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-11-03 03:50:36,805 INFO L87 Difference]: Start difference. First operand 5442 states and 7161 transitions. Second operand has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 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) [2022-11-03 03:50:37,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:37,363 INFO L93 Difference]: Finished difference Result 8034 states and 10583 transitions. [2022-11-03 03:50:37,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 03:50:37,364 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 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 124 [2022-11-03 03:50:37,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:37,388 INFO L225 Difference]: With dead ends: 8034 [2022-11-03 03:50:37,388 INFO L226 Difference]: Without dead ends: 5977 [2022-11-03 03:50:37,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-11-03 03:50:37,397 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 135 mSDsluCounter, 356 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:37,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 514 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:37,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5977 states. [2022-11-03 03:50:37,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5977 to 5719. [2022-11-03 03:50:37,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5719 states, 4627 states have (on average 1.3298033282904689) internal successors, (6153), 4669 states have internal predecessors, (6153), 650 states have call successors, (650), 410 states have call predecessors, (650), 441 states have return successors, (680), 640 states have call predecessors, (680), 648 states have call successors, (680) [2022-11-03 03:50:37,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5719 states to 5719 states and 7483 transitions. [2022-11-03 03:50:37,939 INFO L78 Accepts]: Start accepts. Automaton has 5719 states and 7483 transitions. Word has length 124 [2022-11-03 03:50:37,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:37,940 INFO L495 AbstractCegarLoop]: Abstraction has 5719 states and 7483 transitions. [2022-11-03 03:50:37,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.25) internal successors, (93), 4 states have internal predecessors, (93), 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) [2022-11-03 03:50:37,941 INFO L276 IsEmpty]: Start isEmpty. Operand 5719 states and 7483 transitions. [2022-11-03 03:50:37,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-03 03:50:37,958 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:37,958 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] [2022-11-03 03:50:38,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:38,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-03 03:50:38,175 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:38,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:38,175 INFO L85 PathProgramCache]: Analyzing trace with hash 90400317, now seen corresponding path program 1 times [2022-11-03 03:50:38,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:38,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015905878] [2022-11-03 03:50:38,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:38,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:38,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:38,304 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-11-03 03:50:38,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:38,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015905878] [2022-11-03 03:50:38,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015905878] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:38,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003296404] [2022-11-03 03:50:38,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:38,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:38,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:38,307 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:38,326 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-03 03:50:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:38,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:38,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:38,501 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 03:50:38,501 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:38,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003296404] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:38,502 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:38,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 03:50:38,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756845323] [2022-11-03 03:50:38,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:38,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:38,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:38,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:38,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:38,504 INFO L87 Difference]: Start difference. First operand 5719 states and 7483 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, (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) [2022-11-03 03:50:39,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:39,098 INFO L93 Difference]: Finished difference Result 10799 states and 14313 transitions. [2022-11-03 03:50:39,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:39,099 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, (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 124 [2022-11-03 03:50:39,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:39,130 INFO L225 Difference]: With dead ends: 10799 [2022-11-03 03:50:39,130 INFO L226 Difference]: Without dead ends: 7911 [2022-11-03 03:50:39,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:39,141 INFO L413 NwaCegarLoop]: 199 mSDtfsCounter, 87 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 327 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 [2022-11-03 03:50:39,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 327 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:39,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7911 states. [2022-11-03 03:50:39,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7911 to 6439. [2022-11-03 03:50:39,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6439 states, 5275 states have (on average 1.3598104265402844) internal successors, (7173), 5317 states have internal predecessors, (7173), 686 states have call successors, (686), 446 states have call predecessors, (686), 477 states have return successors, (716), 676 states have call predecessors, (716), 684 states have call successors, (716) [2022-11-03 03:50:39,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6439 states to 6439 states and 8575 transitions. [2022-11-03 03:50:39,756 INFO L78 Accepts]: Start accepts. Automaton has 6439 states and 8575 transitions. Word has length 124 [2022-11-03 03:50:39,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:39,757 INFO L495 AbstractCegarLoop]: Abstraction has 6439 states and 8575 transitions. [2022-11-03 03:50:39,757 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, (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) [2022-11-03 03:50:39,758 INFO L276 IsEmpty]: Start isEmpty. Operand 6439 states and 8575 transitions. [2022-11-03 03:50:39,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-03 03:50:39,781 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:39,782 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, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:39,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:39,994 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:39,995 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:39,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:39,996 INFO L85 PathProgramCache]: Analyzing trace with hash 461396072, now seen corresponding path program 2 times [2022-11-03 03:50:39,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:39,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654680030] [2022-11-03 03:50:39,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:39,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:40,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:40,322 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-03 03:50:40,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:40,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654680030] [2022-11-03 03:50:40,323 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654680030] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:40,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167462333] [2022-11-03 03:50:40,324 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 03:50:40,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:40,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:40,326 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:40,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-03 03:50:40,504 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 03:50:40,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 03:50:40,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:50:40,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:40,536 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-03 03:50:40,536 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:40,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167462333] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:40,537 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:40,537 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:50:40,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328099438] [2022-11-03 03:50:40,538 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:40,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:40,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:40,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:40,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:40,540 INFO L87 Difference]: Start difference. First operand 6439 states and 8575 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 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) [2022-11-03 03:50:41,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:41,148 INFO L93 Difference]: Finished difference Result 8884 states and 11967 transitions. [2022-11-03 03:50:41,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:41,149 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 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 125 [2022-11-03 03:50:41,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:41,176 INFO L225 Difference]: With dead ends: 8884 [2022-11-03 03:50:41,176 INFO L226 Difference]: Without dead ends: 6159 [2022-11-03 03:50:41,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:41,188 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 28 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:41,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 259 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:41,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6159 states. [2022-11-03 03:50:41,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6159 to 5711. [2022-11-03 03:50:41,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5711 states, 4643 states have (on average 1.3708808959724317) internal successors, (6365), 4661 states have internal predecessors, (6365), 654 states have call successors, (654), 414 states have call predecessors, (654), 413 states have return successors, (652), 636 states have call predecessors, (652), 652 states have call successors, (652) [2022-11-03 03:50:41,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5711 states to 5711 states and 7671 transitions. [2022-11-03 03:50:41,734 INFO L78 Accepts]: Start accepts. Automaton has 5711 states and 7671 transitions. Word has length 125 [2022-11-03 03:50:41,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:41,734 INFO L495 AbstractCegarLoop]: Abstraction has 5711 states and 7671 transitions. [2022-11-03 03:50:41,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 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) [2022-11-03 03:50:41,735 INFO L276 IsEmpty]: Start isEmpty. Operand 5711 states and 7671 transitions. [2022-11-03 03:50:41,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-11-03 03:50:41,755 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:41,756 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, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:50:41,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:41,962 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:41,963 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:41,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:41,963 INFO L85 PathProgramCache]: Analyzing trace with hash -1137152252, now seen corresponding path program 1 times [2022-11-03 03:50:41,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:41,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976787113] [2022-11-03 03:50:41,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:41,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:41,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:42,289 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-03 03:50:42,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:42,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976787113] [2022-11-03 03:50:42,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976787113] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:42,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764003670] [2022-11-03 03:50:42,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:42,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:42,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:42,292 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:42,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-03 03:50:42,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:42,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-03 03:50:42,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:42,505 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-03 03:50:42,505 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:42,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764003670] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:42,505 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:42,506 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2022-11-03 03:50:42,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419945747] [2022-11-03 03:50:42,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:42,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:42,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:42,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:42,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:42,509 INFO L87 Difference]: Start difference. First operand 5711 states and 7671 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), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:50:43,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:43,065 INFO L93 Difference]: Finished difference Result 13743 states and 18722 transitions. [2022-11-03 03:50:43,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:43,066 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), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 125 [2022-11-03 03:50:43,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:43,098 INFO L225 Difference]: With dead ends: 13743 [2022-11-03 03:50:43,098 INFO L226 Difference]: Without dead ends: 8083 [2022-11-03 03:50:43,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:43,116 INFO L413 NwaCegarLoop]: 147 mSDtfsCounter, 66 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:43,117 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 258 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:43,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8083 states. [2022-11-03 03:50:43,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8083 to 6471. [2022-11-03 03:50:43,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6471 states, 5329 states have (on average 1.3951960968286734) internal successors, (7435), 5348 states have internal predecessors, (7435), 691 states have call successors, (691), 451 states have call predecessors, (691), 450 states have return successors, (689), 672 states have call predecessors, (689), 689 states have call successors, (689) [2022-11-03 03:50:43,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6471 states to 6471 states and 8815 transitions. [2022-11-03 03:50:43,626 INFO L78 Accepts]: Start accepts. Automaton has 6471 states and 8815 transitions. Word has length 125 [2022-11-03 03:50:43,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:43,627 INFO L495 AbstractCegarLoop]: Abstraction has 6471 states and 8815 transitions. [2022-11-03 03:50:43,627 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), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2022-11-03 03:50:43,628 INFO L276 IsEmpty]: Start isEmpty. Operand 6471 states and 8815 transitions. [2022-11-03 03:50:43,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-11-03 03:50:43,647 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:43,647 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] [2022-11-03 03:50:43,691 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:43,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-03 03:50:43,856 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:43,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:43,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1526255668, now seen corresponding path program 1 times [2022-11-03 03:50:43,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:43,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197327101] [2022-11-03 03:50:43,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:43,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:43,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:44,096 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 15 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-11-03 03:50:44,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:44,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197327101] [2022-11-03 03:50:44,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197327101] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:44,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159012438] [2022-11-03 03:50:44,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:44,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:44,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:44,112 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:44,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-03 03:50:44,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:44,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:50:44,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:44,404 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2022-11-03 03:50:44,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:44,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159012438] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:44,405 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:44,406 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-11-03 03:50:44,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901808606] [2022-11-03 03:50:44,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:44,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:50:44,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:44,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:50:44,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:44,408 INFO L87 Difference]: Start difference. First operand 6471 states and 8815 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 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) [2022-11-03 03:50:45,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:45,648 INFO L93 Difference]: Finished difference Result 15839 states and 21533 transitions. [2022-11-03 03:50:45,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:50:45,649 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 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 [2022-11-03 03:50:45,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:45,683 INFO L225 Difference]: With dead ends: 15839 [2022-11-03 03:50:45,683 INFO L226 Difference]: Without dead ends: 9419 [2022-11-03 03:50:45,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:50:45,699 INFO L413 NwaCegarLoop]: 124 mSDtfsCounter, 461 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:45,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [474 Valid, 282 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 03:50:45,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9419 states. [2022-11-03 03:50:46,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9419 to 9415. [2022-11-03 03:50:46,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9415 states, 7729 states have (on average 1.371846293181524) internal successors, (10603), 7756 states have internal predecessors, (10603), 1015 states have call successors, (1015), 671 states have call predecessors, (1015), 670 states have return successors, (1013), 988 states have call predecessors, (1013), 1013 states have call successors, (1013) [2022-11-03 03:50:46,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9415 states to 9415 states and 12631 transitions. [2022-11-03 03:50:46,513 INFO L78 Accepts]: Start accepts. Automaton has 9415 states and 12631 transitions. Word has length 126 [2022-11-03 03:50:46,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:46,514 INFO L495 AbstractCegarLoop]: Abstraction has 9415 states and 12631 transitions. [2022-11-03 03:50:46,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 5 states have internal predecessors, (79), 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) [2022-11-03 03:50:46,515 INFO L276 IsEmpty]: Start isEmpty. Operand 9415 states and 12631 transitions. [2022-11-03 03:50:46,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-03 03:50:46,543 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:46,543 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] [2022-11-03 03:50:46,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:46,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-03 03:50:46,759 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:46,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:46,759 INFO L85 PathProgramCache]: Analyzing trace with hash 1585081262, now seen corresponding path program 1 times [2022-11-03 03:50:46,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:46,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481895] [2022-11-03 03:50:46,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:46,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:46,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:47,198 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-03 03:50:47,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:47,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481895] [2022-11-03 03:50:47,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481895] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:47,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065401350] [2022-11-03 03:50:47,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:47,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:47,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:47,201 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:47,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-03 03:50:47,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:47,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:50:47,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:47,487 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 52 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-03 03:50:47,487 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:47,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065401350] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:47,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:47,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-11-03 03:50:47,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220674761] [2022-11-03 03:50:47,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:47,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:50:47,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:47,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:50:47,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:47,491 INFO L87 Difference]: Start difference. First operand 9415 states and 12631 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 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) [2022-11-03 03:50:49,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:49,283 INFO L93 Difference]: Finished difference Result 23065 states and 30863 transitions. [2022-11-03 03:50:49,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:50:49,283 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 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 128 [2022-11-03 03:50:49,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:49,344 INFO L225 Difference]: With dead ends: 23065 [2022-11-03 03:50:49,344 INFO L226 Difference]: Without dead ends: 13701 [2022-11-03 03:50:49,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:50:49,373 INFO L413 NwaCegarLoop]: 134 mSDtfsCounter, 456 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 469 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:49,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [469 Valid, 287 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:50:49,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13701 states. [2022-11-03 03:50:50,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13701 to 13697. [2022-11-03 03:50:50,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13697 states, 11205 states have (on average 1.3466309683177153) internal successors, (15089), 11244 states have internal predecessors, (15089), 1493 states have call successors, (1493), 999 states have call predecessors, (1493), 998 states have return successors, (1491), 1454 states have call predecessors, (1491), 1491 states have call successors, (1491) [2022-11-03 03:50:50,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13697 states to 13697 states and 18073 transitions. [2022-11-03 03:50:50,696 INFO L78 Accepts]: Start accepts. Automaton has 13697 states and 18073 transitions. Word has length 128 [2022-11-03 03:50:50,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:50,697 INFO L495 AbstractCegarLoop]: Abstraction has 13697 states and 18073 transitions. [2022-11-03 03:50:50,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 5 states have internal predecessors, (82), 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) [2022-11-03 03:50:50,698 INFO L276 IsEmpty]: Start isEmpty. Operand 13697 states and 18073 transitions. [2022-11-03 03:50:50,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-11-03 03:50:50,731 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:50,732 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, 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] [2022-11-03 03:50:50,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:50,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:50,959 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:50,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:50,959 INFO L85 PathProgramCache]: Analyzing trace with hash 882964627, now seen corresponding path program 1 times [2022-11-03 03:50:50,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:50,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516822334] [2022-11-03 03:50:50,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:50,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:50,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:51,077 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-11-03 03:50:51,078 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:51,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516822334] [2022-11-03 03:50:51,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [516822334] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:51,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254620073] [2022-11-03 03:50:51,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:51,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:51,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:51,080 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:51,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-03 03:50:51,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:51,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:50:51,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:51,287 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 03:50:51,287 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:51,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254620073] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:51,288 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:51,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 03:50:51,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253397141] [2022-11-03 03:50:51,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:51,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:50:51,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:51,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:50:51,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:51,290 INFO L87 Difference]: Start difference. First operand 13697 states and 18073 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, (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) [2022-11-03 03:50:52,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:52,564 INFO L93 Difference]: Finished difference Result 26171 states and 34863 transitions. [2022-11-03 03:50:52,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:50:52,565 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, (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 126 [2022-11-03 03:50:52,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:52,636 INFO L225 Difference]: With dead ends: 26171 [2022-11-03 03:50:52,637 INFO L226 Difference]: Without dead ends: 17075 [2022-11-03 03:50:52,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:50:52,660 INFO L413 NwaCegarLoop]: 205 mSDtfsCounter, 81 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 333 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 [2022-11-03 03:50:52,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 333 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:50:52,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17075 states. [2022-11-03 03:50:53,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17075 to 15515. [2022-11-03 03:50:53,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15515 states, 12807 states have (on average 1.3594909034121965) internal successors, (17411), 12846 states have internal predecessors, (17411), 1601 states have call successors, (1601), 1107 states have call predecessors, (1601), 1106 states have return successors, (1599), 1562 states have call predecessors, (1599), 1599 states have call successors, (1599) [2022-11-03 03:50:53,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15515 states to 15515 states and 20611 transitions. [2022-11-03 03:50:53,924 INFO L78 Accepts]: Start accepts. Automaton has 15515 states and 20611 transitions. Word has length 126 [2022-11-03 03:50:53,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:53,925 INFO L495 AbstractCegarLoop]: Abstraction has 15515 states and 20611 transitions. [2022-11-03 03:50:53,925 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, (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) [2022-11-03 03:50:53,925 INFO L276 IsEmpty]: Start isEmpty. Operand 15515 states and 20611 transitions. [2022-11-03 03:50:53,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-03 03:50:53,955 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:53,955 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] [2022-11-03 03:50:53,997 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:54,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-03 03:50:54,167 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:54,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:54,167 INFO L85 PathProgramCache]: Analyzing trace with hash -550034518, now seen corresponding path program 1 times [2022-11-03 03:50:54,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:54,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342868260] [2022-11-03 03:50:54,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:54,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:54,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:54,414 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 21 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-03 03:50:54,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:54,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342868260] [2022-11-03 03:50:54,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342868260] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:54,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705560855] [2022-11-03 03:50:54,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:54,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:54,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:54,419 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:54,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-03 03:50:54,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:54,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 648 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-03 03:50:54,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:50:54,695 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-03 03:50:54,696 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:50:54,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705560855] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:50:54,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:50:54,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-11-03 03:50:54,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528882908] [2022-11-03 03:50:54,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:50:54,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:50:54,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:50:54,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:50:54,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-03 03:50:54,699 INFO L87 Difference]: Start difference. First operand 15515 states and 20611 transitions. Second operand has 6 states, 5 states have (on average 17.0) internal successors, (85), 5 states have internal predecessors, (85), 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) [2022-11-03 03:50:57,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:50:57,103 INFO L93 Difference]: Finished difference Result 37046 states and 49106 transitions. [2022-11-03 03:50:57,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 03:50:57,104 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.0) internal successors, (85), 5 states have internal predecessors, (85), 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 128 [2022-11-03 03:50:57,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:50:57,196 INFO L225 Difference]: With dead ends: 37046 [2022-11-03 03:50:57,197 INFO L226 Difference]: Without dead ends: 21582 [2022-11-03 03:50:57,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:50:57,233 INFO L413 NwaCegarLoop]: 133 mSDtfsCounter, 355 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:50:57,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 346 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:50:57,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21582 states. [2022-11-03 03:50:59,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21582 to 21578. [2022-11-03 03:50:59,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21578 states, 17714 states have (on average 1.3374731850513717) internal successors, (23692), 17771 states have internal predecessors, (23692), 2287 states have call successors, (2287), 1577 states have call predecessors, (2287), 1576 states have return successors, (2285), 2230 states have call predecessors, (2285), 2285 states have call successors, (2285) [2022-11-03 03:50:59,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21578 states to 21578 states and 28264 transitions. [2022-11-03 03:50:59,249 INFO L78 Accepts]: Start accepts. Automaton has 21578 states and 28264 transitions. Word has length 128 [2022-11-03 03:50:59,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:50:59,249 INFO L495 AbstractCegarLoop]: Abstraction has 21578 states and 28264 transitions. [2022-11-03 03:50:59,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.0) internal successors, (85), 5 states have internal predecessors, (85), 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) [2022-11-03 03:50:59,250 INFO L276 IsEmpty]: Start isEmpty. Operand 21578 states and 28264 transitions. [2022-11-03 03:50:59,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-03 03:50:59,290 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:50:59,290 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] [2022-11-03 03:50:59,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-03 03:50:59,506 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-03 03:50:59,507 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:50:59,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:50:59,507 INFO L85 PathProgramCache]: Analyzing trace with hash -1105620236, now seen corresponding path program 1 times [2022-11-03 03:50:59,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:50:59,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389813108] [2022-11-03 03:50:59,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:59,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:50:59,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:59,712 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 37 proven. 13 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2022-11-03 03:50:59,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:50:59,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389813108] [2022-11-03 03:50:59,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389813108] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:50:59,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [49785448] [2022-11-03 03:50:59,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:50:59,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:50:59,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:50:59,715 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:50:59,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-03 03:50:59,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:50:59,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:50:59,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:00,007 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 03:51:00,008 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:51:00,008 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [49785448] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:51:00,008 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:51:00,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2022-11-03 03:51:00,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990453242] [2022-11-03 03:51:00,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:51:00,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:51:00,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:00,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:51:00,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:51:00,013 INFO L87 Difference]: Start difference. First operand 21578 states and 28264 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 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) [2022-11-03 03:51:02,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:02,214 INFO L93 Difference]: Finished difference Result 40164 states and 52876 transitions. [2022-11-03 03:51:02,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:51:02,215 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 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 130 [2022-11-03 03:51:02,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:02,301 INFO L225 Difference]: With dead ends: 40164 [2022-11-03 03:51:02,301 INFO L226 Difference]: Without dead ends: 25136 [2022-11-03 03:51:02,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:51:02,336 INFO L413 NwaCegarLoop]: 142 mSDtfsCounter, 98 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:02,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 178 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:51:02,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25136 states. [2022-11-03 03:51:05,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25136 to 24868. [2022-11-03 03:51:05,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24868 states, 20765 states have (on average 1.3130267276667469) internal successors, (27265), 20822 states have internal predecessors, (27265), 2325 states have call successors, (2325), 1778 states have call predecessors, (2325), 1777 states have return successors, (2495), 2268 states have call predecessors, (2495), 2323 states have call successors, (2495) [2022-11-03 03:51:05,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24868 states to 24868 states and 32085 transitions. [2022-11-03 03:51:05,181 INFO L78 Accepts]: Start accepts. Automaton has 24868 states and 32085 transitions. Word has length 130 [2022-11-03 03:51:05,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:05,181 INFO L495 AbstractCegarLoop]: Abstraction has 24868 states and 32085 transitions. [2022-11-03 03:51:05,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 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) [2022-11-03 03:51:05,181 INFO L276 IsEmpty]: Start isEmpty. Operand 24868 states and 32085 transitions. [2022-11-03 03:51:05,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-11-03 03:51:05,221 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:05,221 INFO L195 NwaCegarLoop]: trace histogram [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, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 03:51:05,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:05,425 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:05,425 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:51:05,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:05,426 INFO L85 PathProgramCache]: Analyzing trace with hash 961186770, now seen corresponding path program 1 times [2022-11-03 03:51:05,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:51:05,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316810123] [2022-11-03 03:51:05,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:05,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:51:05,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:05,656 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 46 proven. 20 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-03 03:51:05,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:51:05,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316810123] [2022-11-03 03:51:05,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316810123] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:05,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [614331772] [2022-11-03 03:51:05,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:05,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:05,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:05,658 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:05,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-03 03:51:05,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:05,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-03 03:51:05,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:05,948 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 88 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 03:51:05,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:51:05,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [614331772] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:51:05,949 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:51:05,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 6 [2022-11-03 03:51:05,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588873394] [2022-11-03 03:51:05,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:51:05,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-03 03:51:05,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:05,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-03 03:51:05,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:51:05,951 INFO L87 Difference]: Start difference. First operand 24868 states and 32085 transitions. Second operand has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2022-11-03 03:51:09,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:09,298 INFO L93 Difference]: Finished difference Result 49178 states and 63667 transitions. [2022-11-03 03:51:09,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 03:51:09,299 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 132 [2022-11-03 03:51:09,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:09,378 INFO L225 Difference]: With dead ends: 49178 [2022-11-03 03:51:09,378 INFO L226 Difference]: Without dead ends: 31960 [2022-11-03 03:51:09,409 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-11-03 03:51:09,410 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 238 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 572 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:09,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 572 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 03:51:09,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31960 states. [2022-11-03 03:51:12,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31960 to 30332. [2022-11-03 03:51:12,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30332 states, 25243 states have (on average 1.3019450936893395) internal successors, (32865), 25264 states have internal predecessors, (32865), 2931 states have call successors, (2931), 2222 states have call predecessors, (2931), 2157 states have return successors, (3191), 2846 states have call predecessors, (3191), 2929 states have call successors, (3191) [2022-11-03 03:51:12,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30332 states to 30332 states and 38987 transitions. [2022-11-03 03:51:12,341 INFO L78 Accepts]: Start accepts. Automaton has 30332 states and 38987 transitions. Word has length 132 [2022-11-03 03:51:12,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:12,344 INFO L495 AbstractCegarLoop]: Abstraction has 30332 states and 38987 transitions. [2022-11-03 03:51:12,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.166666666666668) internal successors, (109), 6 states have internal predecessors, (109), 5 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2022-11-03 03:51:12,345 INFO L276 IsEmpty]: Start isEmpty. Operand 30332 states and 38987 transitions. [2022-11-03 03:51:12,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2022-11-03 03:51:12,397 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:12,398 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, 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] [2022-11-03 03:51:12,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-03 03:51:12,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:12,613 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:51:12,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:12,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1092151709, now seen corresponding path program 1 times [2022-11-03 03:51:12,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:51:12,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175914564] [2022-11-03 03:51:12,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:12,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:51:12,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:12,745 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-11-03 03:51:12,745 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:51:12,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175914564] [2022-11-03 03:51:12,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175914564] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:12,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544003267] [2022-11-03 03:51:12,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:12,747 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:12,747 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:12,748 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:12,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-03 03:51:12,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:12,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 643 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-03 03:51:12,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:12,983 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 03:51:12,983 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:51:12,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544003267] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:51:12,984 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:51:12,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-11-03 03:51:12,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447423363] [2022-11-03 03:51:12,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:51:12,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:51:12,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:12,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:51:12,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:51:12,987 INFO L87 Difference]: Start difference. First operand 30332 states and 38987 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, (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) [2022-11-03 03:51:15,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 03:51:15,973 INFO L93 Difference]: Finished difference Result 56938 states and 73991 transitions. [2022-11-03 03:51:15,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-03 03:51:15,974 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, (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 126 [2022-11-03 03:51:15,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 03:51:16,075 INFO L225 Difference]: With dead ends: 56938 [2022-11-03 03:51:16,075 INFO L226 Difference]: Without dead ends: 36694 [2022-11-03 03:51:16,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:51:16,108 INFO L413 NwaCegarLoop]: 189 mSDtfsCounter, 73 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 03:51:16,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 317 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 03:51:16,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36694 states. [2022-11-03 03:51:19,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36694 to 33282. [2022-11-03 03:51:19,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33282 states, 27809 states have (on average 1.3101154302563918) internal successors, (36433), 27830 states have internal predecessors, (36433), 3123 states have call successors, (3123), 2414 states have call predecessors, (3123), 2349 states have return successors, (3383), 3038 states have call predecessors, (3383), 3121 states have call successors, (3383) [2022-11-03 03:51:19,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33282 states to 33282 states and 42939 transitions. [2022-11-03 03:51:19,692 INFO L78 Accepts]: Start accepts. Automaton has 33282 states and 42939 transitions. Word has length 126 [2022-11-03 03:51:19,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 03:51:19,693 INFO L495 AbstractCegarLoop]: Abstraction has 33282 states and 42939 transitions. [2022-11-03 03:51:19,693 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, (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) [2022-11-03 03:51:19,693 INFO L276 IsEmpty]: Start isEmpty. Operand 33282 states and 42939 transitions. [2022-11-03 03:51:19,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-03 03:51:19,733 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 03:51:19,733 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] [2022-11-03 03:51:19,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-11-03 03:51:19,934 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-03 03:51:19,934 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 03:51:19,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 03:51:19,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1740047414, now seen corresponding path program 1 times [2022-11-03 03:51:19,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 03:51:19,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209939163] [2022-11-03 03:51:19,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:19,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 03:51:19,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:20,089 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 41 proven. 15 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-11-03 03:51:20,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 03:51:20,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209939163] [2022-11-03 03:51:20,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209939163] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 03:51:20,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538130621] [2022-11-03 03:51:20,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 03:51:20,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 03:51:20,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 03:51:20,091 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 03:51:20,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6948ad6-37c5-4752-855b-1890f970b34d/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-03 03:51:20,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 03:51:20,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 03:51:20,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 03:51:20,366 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-03 03:51:20,367 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-03 03:51:20,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538130621] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 03:51:20,367 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-03 03:51:20,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 6 [2022-11-03 03:51:20,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590634866] [2022-11-03 03:51:20,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 03:51:20,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-03 03:51:20,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 03:51:20,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-03 03:51:20,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-03 03:51:20,369 INFO L87 Difference]: Start difference. First operand 33282 states and 42939 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 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)