./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a9fe331e5302255756e033832e890b54b7bae1c0bb354f9ba1bbe18985f952e5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:51:51,495 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:51:51,498 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:51:51,558 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:51:51,559 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:51:51,565 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:51:51,569 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:51:51,575 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:51:51,579 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:51:51,588 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:51:51,589 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:51:51,592 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:51:51,592 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:51:51,595 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:51:51,597 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:51:51,603 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:51:51,605 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:51:51,607 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:51:51,613 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:51:51,621 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:51:51,626 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:51:51,627 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:51:51,631 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:51:51,633 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:51:51,638 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:51:51,639 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:51:51,639 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:51:51,642 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:51:51,643 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:51:51,645 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:51:51,646 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:51:51,647 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:51:51,649 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:51:51,651 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:51:51,653 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:51:51,653 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:51:51,654 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:51:51,654 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:51:51,655 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:51:51,656 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:51:51,657 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:51:51,658 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:51:51,713 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:51:51,714 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:51:51,715 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:51:51,715 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:51:51,723 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:51:51,723 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:51:51,724 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:51:51,724 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:51:51,724 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:51:51,725 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:51:51,726 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:51:51,726 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:51:51,726 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:51:51,726 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:51:51,727 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:51:51,727 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:51:51,727 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:51:51,728 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:51:51,728 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:51:51,729 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:51:51,729 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:51:51,729 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:51:51,729 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:51:51,730 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:51:51,730 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:51:51,730 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:51:51,732 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:51:51,732 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:51:51,733 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:51:51,733 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:51:51,733 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:51:51,734 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:51:51,734 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:51:51,734 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:51:51,734 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:51:51,735 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:51:51,735 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:51:51,735 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:51:51,735 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:51:51,736 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:51:51,736 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:51:51,736 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a9fe331e5302255756e033832e890b54b7bae1c0bb354f9ba1bbe18985f952e5 [2021-11-23 03:51:52,044 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:51:52,073 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:51:52,077 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:51:52,078 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:51:52,079 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:51:52,081 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c [2021-11-23 03:51:52,174 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/data/a86316aa3/58b2ded55ecf4d52a5c17edb06fce0d2/FLAGc9414f303 [2021-11-23 03:51:52,885 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:51:52,886 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c [2021-11-23 03:51:52,906 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/data/a86316aa3/58b2ded55ecf4d52a5c17edb06fce0d2/FLAGc9414f303 [2021-11-23 03:51:53,189 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/data/a86316aa3/58b2ded55ecf4d52a5c17edb06fce0d2 [2021-11-23 03:51:53,192 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:51:53,193 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:51:53,196 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:51:53,199 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:51:53,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:51:53,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:51:53" (1/1) ... [2021-11-23 03:51:53,207 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6aff6e79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:53, skipping insertion in model container [2021-11-23 03:51:53,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:51:53" (1/1) ... [2021-11-23 03:51:53,216 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:51:53,287 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:51:53,520 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_1a1e9097-bc23-4360-9751-9a79ce7b4de8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c[913,926] [2021-11-23 03:51:53,582 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_1a1e9097-bc23-4360-9751-9a79ce7b4de8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c[5977,5990] [2021-11-23 03:51:53,791 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:51:53,812 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:51:53,836 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_1a1e9097-bc23-4360-9751-9a79ce7b4de8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c[913,926] [2021-11-23 03:51:53,866 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_1a1e9097-bc23-4360-9751-9a79ce7b4de8/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.15.cil.c[5977,5990] [2021-11-23 03:51:53,981 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:51:54,018 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:51:54,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54 WrapperNode [2021-11-23 03:51:54,019 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:51:54,020 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:51:54,020 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:51:54,021 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:51:54,029 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,049 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,141 INFO L137 Inliner]: procedures = 74, calls = 88, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 1116 [2021-11-23 03:51:54,142 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:51:54,142 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:51:54,143 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:51:54,143 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:51:54,153 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,160 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,160 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,194 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,227 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,244 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:51:54,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:51:54,255 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:51:54,255 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:51:54,256 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (1/1) ... [2021-11-23 03:51:54,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:51:54,300 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:51:54,314 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:51:54,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:51:54,363 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:51:54,363 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:51:54,363 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:51:54,363 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2021-11-23 03:51:54,364 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2021-11-23 03:51:54,364 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 03:51:54,364 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 03:51:54,364 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 03:51:54,364 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 03:51:54,365 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 03:51:54,365 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 03:51:54,365 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 03:51:54,365 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 03:51:54,365 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 03:51:54,366 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 03:51:54,366 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:51:54,366 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 03:51:54,366 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 03:51:54,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:51:54,367 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:51:54,367 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 03:51:54,367 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 03:51:54,367 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 03:51:54,367 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 03:51:54,585 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:51:54,587 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:51:55,788 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:51:56,442 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:51:56,443 INFO L301 CfgBuilder]: Removed 20 assume(true) statements. [2021-11-23 03:51:56,447 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:51:56 BoogieIcfgContainer [2021-11-23 03:51:56,447 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:51:56,450 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:51:56,450 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:51:56,454 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:51:56,454 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:51:53" (1/3) ... [2021-11-23 03:51:56,455 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@200f19b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:51:56, skipping insertion in model container [2021-11-23 03:51:56,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:51:54" (2/3) ... [2021-11-23 03:51:56,456 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@200f19b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:51:56, skipping insertion in model container [2021-11-23 03:51:56,456 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:51:56" (3/3) ... [2021-11-23 03:51:56,458 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.15.cil.c [2021-11-23 03:51:56,465 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:51:56,465 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:51:56,527 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:51:56,536 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:51:56,536 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:51:56,565 INFO L276 IsEmpty]: Start isEmpty. Operand has 256 states, 208 states have (on average 1.5721153846153846) internal successors, (327), 215 states have internal predecessors, (327), 35 states have call successors, (35), 10 states have call predecessors, (35), 10 states have return successors, (35), 33 states have call predecessors, (35), 35 states have call successors, (35) [2021-11-23 03:51:56,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:51:56,575 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:56,575 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:51:56,576 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:56,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:56,583 INFO L85 PathProgramCache]: Analyzing trace with hash 684296215, now seen corresponding path program 1 times [2021-11-23 03:51:56,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:56,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1044831128] [2021-11-23 03:51:56,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:56,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:56,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:56,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:51:56,862 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:56,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1044831128] [2021-11-23 03:51:56,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1044831128] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:56,863 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:56,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:51:56,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788570449] [2021-11-23 03:51:56,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:56,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:51:56,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:56,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:51:56,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:56,921 INFO L87 Difference]: Start difference. First operand has 256 states, 208 states have (on average 1.5721153846153846) internal successors, (327), 215 states have internal predecessors, (327), 35 states have call successors, (35), 10 states have call predecessors, (35), 10 states have return successors, (35), 33 states have call predecessors, (35), 35 states have call successors, (35) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:51:57,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:57,314 INFO L93 Difference]: Finished difference Result 544 states and 842 transitions. [2021-11-23 03:51:57,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:51:57,318 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-11-23 03:51:57,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:57,342 INFO L225 Difference]: With dead ends: 544 [2021-11-23 03:51:57,342 INFO L226 Difference]: Without dead ends: 288 [2021-11-23 03:51:57,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:57,359 INFO L933 BasicCegarLoop]: 336 mSDtfsCounter, 362 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:57,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [362 Valid, 391 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:51:57,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-23 03:51:57,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 284. [2021-11-23 03:51:57,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 234 states have (on average 1.5128205128205128) internal successors, (354), 238 states have internal predecessors, (354), 38 states have call successors, (38), 12 states have call predecessors, (38), 10 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 03:51:57,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 426 transitions. [2021-11-23 03:51:57,520 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 426 transitions. Word has length 28 [2021-11-23 03:51:57,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:57,520 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 426 transitions. [2021-11-23 03:51:57,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:51:57,521 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 426 transitions. [2021-11-23 03:51:57,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 03:51:57,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:57,524 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:51:57,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:51:57,525 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:57,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:57,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1229490957, now seen corresponding path program 1 times [2021-11-23 03:51:57,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:57,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669365554] [2021-11-23 03:51:57,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:57,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:57,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:57,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:51:57,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:57,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669365554] [2021-11-23 03:51:57,615 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [669365554] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:57,615 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:57,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:51:57,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428203480] [2021-11-23 03:51:57,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:57,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:51:57,617 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:57,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:51:57,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:57,619 INFO L87 Difference]: Start difference. First operand 284 states and 426 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:51:57,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:57,774 INFO L93 Difference]: Finished difference Result 440 states and 643 transitions. [2021-11-23 03:51:57,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:51:57,775 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-11-23 03:51:57,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:57,779 INFO L225 Difference]: With dead ends: 440 [2021-11-23 03:51:57,779 INFO L226 Difference]: Without dead ends: 359 [2021-11-23 03:51:57,780 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:57,782 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 360 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:57,783 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [360 Valid, 376 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:51:57,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2021-11-23 03:51:57,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 355. [2021-11-23 03:51:57,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 294 states have (on average 1.4795918367346939) internal successors, (435), 298 states have internal predecessors, (435), 45 states have call successors, (45), 16 states have call predecessors, (45), 14 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-23 03:51:57,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 521 transitions. [2021-11-23 03:51:57,815 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 521 transitions. Word has length 29 [2021-11-23 03:51:57,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:57,816 INFO L470 AbstractCegarLoop]: Abstraction has 355 states and 521 transitions. [2021-11-23 03:51:57,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:51:57,816 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 521 transitions. [2021-11-23 03:51:57,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 03:51:57,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:57,819 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:51:57,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:51:57,820 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:57,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:57,821 INFO L85 PathProgramCache]: Analyzing trace with hash -2112355397, now seen corresponding path program 1 times [2021-11-23 03:51:57,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:57,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363482708] [2021-11-23 03:51:57,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:57,822 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:57,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:57,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:51:57,894 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:57,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363482708] [2021-11-23 03:51:57,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363482708] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:57,895 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:57,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:51:57,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324330330] [2021-11-23 03:51:57,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:57,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:51:57,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:57,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:51:57,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:57,897 INFO L87 Difference]: Start difference. First operand 355 states and 521 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:51:58,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:58,093 INFO L93 Difference]: Finished difference Result 595 states and 849 transitions. [2021-11-23 03:51:58,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:51:58,093 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-11-23 03:51:58,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:58,098 INFO L225 Difference]: With dead ends: 595 [2021-11-23 03:51:58,098 INFO L226 Difference]: Without dead ends: 443 [2021-11-23 03:51:58,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:58,109 INFO L933 BasicCegarLoop]: 333 mSDtfsCounter, 46 mSDsluCounter, 360 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 637 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:58,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 637 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:51:58,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-11-23 03:51:58,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 429. [2021-11-23 03:51:58,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 357 states have (on average 1.4565826330532212) internal successors, (520), 363 states have internal predecessors, (520), 51 states have call successors, (51), 21 states have call predecessors, (51), 19 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2021-11-23 03:51:58,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 618 transitions. [2021-11-23 03:51:58,178 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 618 transitions. Word has length 30 [2021-11-23 03:51:58,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:58,178 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 618 transitions. [2021-11-23 03:51:58,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:51:58,179 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 618 transitions. [2021-11-23 03:51:58,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 03:51:58,189 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:58,190 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:51:58,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:51:58,193 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:58,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:58,194 INFO L85 PathProgramCache]: Analyzing trace with hash 14284306, now seen corresponding path program 1 times [2021-11-23 03:51:58,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:58,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936458402] [2021-11-23 03:51:58,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:58,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:58,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:58,343 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:51:58,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:58,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936458402] [2021-11-23 03:51:58,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936458402] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:58,346 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:58,346 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:51:58,346 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931226759] [2021-11-23 03:51:58,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:58,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:51:58,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:58,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:51:58,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:58,349 INFO L87 Difference]: Start difference. First operand 429 states and 618 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:51:58,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:58,556 INFO L93 Difference]: Finished difference Result 592 states and 836 transitions. [2021-11-23 03:51:58,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:51:58,557 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2021-11-23 03:51:58,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:58,564 INFO L225 Difference]: With dead ends: 592 [2021-11-23 03:51:58,564 INFO L226 Difference]: Without dead ends: 434 [2021-11-23 03:51:58,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:58,573 INFO L933 BasicCegarLoop]: 352 mSDtfsCounter, 32 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 669 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:58,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 669 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:51:58,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-23 03:51:58,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 423. [2021-11-23 03:51:58,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 351 states have (on average 1.4415954415954415) internal successors, (506), 357 states have internal predecessors, (506), 51 states have call successors, (51), 21 states have call predecessors, (51), 19 states have return successors, (47), 45 states have call predecessors, (47), 47 states have call successors, (47) [2021-11-23 03:51:58,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 604 transitions. [2021-11-23 03:51:58,620 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 604 transitions. Word has length 43 [2021-11-23 03:51:58,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:58,621 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 604 transitions. [2021-11-23 03:51:58,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:51:58,621 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 604 transitions. [2021-11-23 03:51:58,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:51:58,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:58,624 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:51:58,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:51:58,625 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:58,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:58,636 INFO L85 PathProgramCache]: Analyzing trace with hash 2026671885, now seen corresponding path program 1 times [2021-11-23 03:51:58,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:58,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108222737] [2021-11-23 03:51:58,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:58,637 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:58,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:58,689 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:51:58,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:58,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108222737] [2021-11-23 03:51:58,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108222737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:58,690 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:58,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:51:58,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483008356] [2021-11-23 03:51:58,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:58,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:51:58,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:58,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:51:58,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:58,693 INFO L87 Difference]: Start difference. First operand 423 states and 604 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:51:58,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:58,835 INFO L93 Difference]: Finished difference Result 672 states and 928 transitions. [2021-11-23 03:51:58,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:51:58,836 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-11-23 03:51:58,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:58,840 INFO L225 Difference]: With dead ends: 672 [2021-11-23 03:51:58,840 INFO L226 Difference]: Without dead ends: 469 [2021-11-23 03:51:58,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:51:58,843 INFO L933 BasicCegarLoop]: 322 mSDtfsCounter, 346 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 374 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:58,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [346 Valid, 374 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:51:58,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-11-23 03:51:58,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 469. [2021-11-23 03:51:58,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 390 states have (on average 1.4076923076923078) internal successors, (549), 396 states have internal predecessors, (549), 55 states have call successors, (55), 24 states have call predecessors, (55), 22 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2021-11-23 03:51:58,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 655 transitions. [2021-11-23 03:51:58,879 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 655 transitions. Word has length 46 [2021-11-23 03:51:58,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:58,879 INFO L470 AbstractCegarLoop]: Abstraction has 469 states and 655 transitions. [2021-11-23 03:51:58,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:51:58,880 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 655 transitions. [2021-11-23 03:51:58,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:51:58,881 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:58,882 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:51:58,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:51:58,882 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:58,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:58,883 INFO L85 PathProgramCache]: Analyzing trace with hash -859052702, now seen corresponding path program 1 times [2021-11-23 03:51:58,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:58,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511213331] [2021-11-23 03:51:58,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:58,884 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:58,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:58,953 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:51:58,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:58,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511213331] [2021-11-23 03:51:58,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511213331] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:58,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:58,954 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:51:58,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013096352] [2021-11-23 03:51:58,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:58,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:51:58,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:58,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:51:58,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:51:58,958 INFO L87 Difference]: Start difference. First operand 469 states and 655 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:51:59,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:59,255 INFO L93 Difference]: Finished difference Result 696 states and 955 transitions. [2021-11-23 03:51:59,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:51:59,256 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2021-11-23 03:51:59,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:59,260 INFO L225 Difference]: With dead ends: 696 [2021-11-23 03:51:59,260 INFO L226 Difference]: Without dead ends: 467 [2021-11-23 03:51:59,261 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:51:59,262 INFO L933 BasicCegarLoop]: 350 mSDtfsCounter, 401 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:59,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [401 Valid, 626 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:51:59,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2021-11-23 03:51:59,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 465. [2021-11-23 03:51:59,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 386 states have (on average 1.3808290155440415) internal successors, (533), 392 states have internal predecessors, (533), 55 states have call successors, (55), 24 states have call predecessors, (55), 22 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2021-11-23 03:51:59,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 639 transitions. [2021-11-23 03:51:59,303 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 639 transitions. Word has length 47 [2021-11-23 03:51:59,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:59,304 INFO L470 AbstractCegarLoop]: Abstraction has 465 states and 639 transitions. [2021-11-23 03:51:59,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:51:59,304 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 639 transitions. [2021-11-23 03:51:59,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:51:59,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:59,307 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:51:59,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:51:59,308 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:59,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:59,308 INFO L85 PathProgramCache]: Analyzing trace with hash 13785953, now seen corresponding path program 1 times [2021-11-23 03:51:59,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:59,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470352748] [2021-11-23 03:51:59,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:59,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:59,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:59,400 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:51:59,400 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:59,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470352748] [2021-11-23 03:51:59,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470352748] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:51:59,400 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:51:59,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:51:59,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80042851] [2021-11-23 03:51:59,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:51:59,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:51:59,401 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:51:59,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:51:59,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:51:59,402 INFO L87 Difference]: Start difference. First operand 465 states and 639 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:51:59,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:51:59,677 INFO L93 Difference]: Finished difference Result 501 states and 680 transitions. [2021-11-23 03:51:59,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:51:59,678 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2021-11-23 03:51:59,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:51:59,682 INFO L225 Difference]: With dead ends: 501 [2021-11-23 03:51:59,682 INFO L226 Difference]: Without dead ends: 498 [2021-11-23 03:51:59,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:51:59,684 INFO L933 BasicCegarLoop]: 328 mSDtfsCounter, 624 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:51:59,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 367 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:51:59,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2021-11-23 03:51:59,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 464. [2021-11-23 03:51:59,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 386 states have (on average 1.3756476683937824) internal successors, (531), 391 states have internal predecessors, (531), 54 states have call successors, (54), 24 states have call predecessors, (54), 22 states have return successors, (51), 49 states have call predecessors, (51), 51 states have call successors, (51) [2021-11-23 03:51:59,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 636 transitions. [2021-11-23 03:51:59,724 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 636 transitions. Word has length 47 [2021-11-23 03:51:59,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:51:59,725 INFO L470 AbstractCegarLoop]: Abstraction has 464 states and 636 transitions. [2021-11-23 03:51:59,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:51:59,726 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 636 transitions. [2021-11-23 03:51:59,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:51:59,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:51:59,729 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:51:59,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:51:59,729 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:51:59,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:51:59,730 INFO L85 PathProgramCache]: Analyzing trace with hash 425881776, now seen corresponding path program 1 times [2021-11-23 03:51:59,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:51:59,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916035507] [2021-11-23 03:51:59,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:59,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:51:59,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:51:59,875 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:51:59,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:51:59,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916035507] [2021-11-23 03:51:59,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916035507] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:51:59,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455234014] [2021-11-23 03:51:59,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:51:59,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:51:59,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:51:59,884 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:51:59,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:52:00,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:52:00,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:52:00,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:52:00,478 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:52:00,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:52:00,706 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:52:00,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455234014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:52:00,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1502335153] [2021-11-23 03:52:00,727 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2021-11-23 03:52:00,727 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:52:00,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:52:00,739 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:52:00,739 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:52:07,866 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 195 for LOIs [2021-11-23 03:52:07,903 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 210 for LOIs [2021-11-23 03:52:07,945 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 436 for LOIs [2021-11-23 03:52:10,725 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:52:25,332 WARN L227 SmtUtils]: Spent 8.32s on a formula simplification. DAG size of input: 425 DAG size of output: 323 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:52:34,059 WARN L227 SmtUtils]: Spent 7.85s on a formula simplification. DAG size of input: 436 DAG size of output: 337 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:52:43,439 WARN L227 SmtUtils]: Spent 8.05s on a formula simplification. DAG size of input: 443 DAG size of output: 341 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:53:00,954 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10466#(and (= ~E_12~0 2) (= ~T6_E~0 2) (= ~t6_i~0 0) (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~T11_E~0 2) (= ~t10_i~0 0) (= ~t7_i~0 0) (= ~t1_pc~0 0) (= 0 ~t8_pc~0) (= 0 ~t7_pc~0) (= ~T4_E~0 2) (= ~E_13~0 2) (= ~E_7~0 2) (= ~E_8~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (= ~t13_st~0 0) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~E_10~0 2) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~T9_E~0 2) (= 0 ~t6_pc~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= 0 ~t6_st~0) (= ~t9_i~0 0) (= ~t2_i~0 0) (= 0 ~t8_st~0) (= ~E_6~0 2) (= ~t4_i~0 0) (= ~E_11~0 2) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~T7_E~0 2) (<= ~p_num_write~0 1) (= ~m_i~0 0) (= ~t10_st~0 0) (= ~t10_pc~0 0) (= 0 ~t9_pc~0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~t11_pc~0 0) (<= 0 (+ ~q_buf_0~0 2147483648)) (= ~p_dw_pc~0 1) (= ~T12_E~0 2) (= ~t11_i~0 0) (= ~T13_E~0 2) (= ~q_write_ev~0 2) (= ~t12_pc~0 0) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~t12_i~0 0) (= ~local~0 0) (= ~t3_i~0 0) (= 0 ~t7_st~0) (= ~t8_i~0 0) (= ~t13_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= 0 ~t9_st~0) (= ~T10_E~0 2) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (<= ~p_last_write~0 2147483647) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= ~t12_st~0 0) (= 0 ~t4_pc~0) (= ~t13_pc~0 0) (= ~t11_st~0 0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~T8_E~0 2) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~E_9~0 2) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 03:53:00,955 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:53:00,955 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:53:00,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2021-11-23 03:53:00,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238749790] [2021-11-23 03:53:00,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:53:00,956 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:53:00,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:00,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:53:00,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 03:53:00,958 INFO L87 Difference]: Start difference. First operand 464 states and 636 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:53:01,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:01,460 INFO L93 Difference]: Finished difference Result 865 states and 1134 transitions. [2021-11-23 03:53:01,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:53:01,461 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2021-11-23 03:53:01,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:01,469 INFO L225 Difference]: With dead ends: 865 [2021-11-23 03:53:01,470 INFO L226 Difference]: Without dead ends: 862 [2021-11-23 03:53:01,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 108 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 50.3s TimeCoverageRelationStatistics Valid=118, Invalid=1072, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 03:53:01,472 INFO L933 BasicCegarLoop]: 378 mSDtfsCounter, 515 mSDsluCounter, 820 mSDsCounter, 0 mSdLazyCounter, 399 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 515 SdHoareTripleChecker+Valid, 1059 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:01,472 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [515 Valid, 1059 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 399 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:53:01,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 862 states. [2021-11-23 03:53:01,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 862 to 663. [2021-11-23 03:53:01,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 663 states, 553 states have (on average 1.3417721518987342) internal successors, (742), 560 states have internal predecessors, (742), 73 states have call successors, (73), 37 states have call predecessors, (73), 35 states have return successors, (70), 66 states have call predecessors, (70), 70 states have call successors, (70) [2021-11-23 03:53:01,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 663 states to 663 states and 885 transitions. [2021-11-23 03:53:01,534 INFO L78 Accepts]: Start accepts. Automaton has 663 states and 885 transitions. Word has length 48 [2021-11-23 03:53:01,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:01,535 INFO L470 AbstractCegarLoop]: Abstraction has 663 states and 885 transitions. [2021-11-23 03:53:01,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:53:01,535 INFO L276 IsEmpty]: Start isEmpty. Operand 663 states and 885 transitions. [2021-11-23 03:53:01,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:53:01,538 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:01,539 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 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] [2021-11-23 03:53:01,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:01,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 03:53:01,740 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:01,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:01,743 INFO L85 PathProgramCache]: Analyzing trace with hash 1337001838, now seen corresponding path program 2 times [2021-11-23 03:53:01,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:01,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761413288] [2021-11-23 03:53:01,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:01,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:01,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:01,774 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:53:01,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:01,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761413288] [2021-11-23 03:53:01,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761413288] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:01,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:53:01,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:53:01,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593561950] [2021-11-23 03:53:01,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:01,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:01,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:01,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:01,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:53:01,777 INFO L87 Difference]: Start difference. First operand 663 states and 885 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:53:01,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:01,932 INFO L93 Difference]: Finished difference Result 969 states and 1270 transitions. [2021-11-23 03:53:01,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:01,932 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2021-11-23 03:53:01,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:01,936 INFO L225 Difference]: With dead ends: 969 [2021-11-23 03:53:01,936 INFO L226 Difference]: Without dead ends: 607 [2021-11-23 03:53:01,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:53:01,938 INFO L933 BasicCegarLoop]: 340 mSDtfsCounter, 357 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 357 SdHoareTripleChecker+Valid, 383 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 [2021-11-23 03:53:01,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [357 Valid, 383 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:01,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-11-23 03:53:01,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 604. [2021-11-23 03:53:01,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 604 states, 504 states have (on average 1.3333333333333333) internal successors, (672), 512 states have internal predecessors, (672), 67 states have call successors, (67), 33 states have call predecessors, (67), 31 states have return successors, (64), 59 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-23 03:53:01,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 604 states to 604 states and 803 transitions. [2021-11-23 03:53:01,978 INFO L78 Accepts]: Start accepts. Automaton has 604 states and 803 transitions. Word has length 61 [2021-11-23 03:53:01,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:01,979 INFO L470 AbstractCegarLoop]: Abstraction has 604 states and 803 transitions. [2021-11-23 03:53:01,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:53:01,979 INFO L276 IsEmpty]: Start isEmpty. Operand 604 states and 803 transitions. [2021-11-23 03:53:01,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 03:53:01,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:01,982 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:01,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:53:01,982 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:01,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:01,983 INFO L85 PathProgramCache]: Analyzing trace with hash -44243253, now seen corresponding path program 1 times [2021-11-23 03:53:01,983 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:01,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393894011] [2021-11-23 03:53:01,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:01,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:02,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:02,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:53:02,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:02,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393894011] [2021-11-23 03:53:02,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393894011] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:02,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:53:02,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:53:02,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273411397] [2021-11-23 03:53:02,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:02,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:53:02,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:02,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:53:02,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:53:02,090 INFO L87 Difference]: Start difference. First operand 604 states and 803 transitions. Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:53:02,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:02,507 INFO L93 Difference]: Finished difference Result 986 states and 1428 transitions. [2021-11-23 03:53:02,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:53:02,507 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 71 [2021-11-23 03:53:02,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:02,513 INFO L225 Difference]: With dead ends: 986 [2021-11-23 03:53:02,513 INFO L226 Difference]: Without dead ends: 789 [2021-11-23 03:53:02,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:53:02,516 INFO L933 BasicCegarLoop]: 546 mSDtfsCounter, 608 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 979 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:02,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [608 Valid, 979 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:53:02,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 789 states. [2021-11-23 03:53:02,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 789 to 788. [2021-11-23 03:53:02,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 788 states, 659 states have (on average 1.3748103186646434) internal successors, (906), 668 states have internal predecessors, (906), 90 states have call successors, (90), 39 states have call predecessors, (90), 37 states have return successors, (87), 81 states have call predecessors, (87), 87 states have call successors, (87) [2021-11-23 03:53:02,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 788 states to 788 states and 1083 transitions. [2021-11-23 03:53:02,572 INFO L78 Accepts]: Start accepts. Automaton has 788 states and 1083 transitions. Word has length 71 [2021-11-23 03:53:02,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:02,573 INFO L470 AbstractCegarLoop]: Abstraction has 788 states and 1083 transitions. [2021-11-23 03:53:02,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:53:02,573 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 1083 transitions. [2021-11-23 03:53:02,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-23 03:53:02,575 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:02,576 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 03:53:02,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:53:02,576 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:02,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:02,577 INFO L85 PathProgramCache]: Analyzing trace with hash 70595426, now seen corresponding path program 1 times [2021-11-23 03:53:02,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:02,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834282911] [2021-11-23 03:53:02,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:02,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:02,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:02,634 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:53:02,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:02,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834282911] [2021-11-23 03:53:02,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834282911] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:02,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104227315] [2021-11-23 03:53:02,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:02,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:02,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:02,637 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:02,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:53:02,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:02,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:02,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:02,914 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:53:02,915 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:02,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104227315] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:02,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:02,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:53:02,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710029906] [2021-11-23 03:53:02,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:02,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:02,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:02,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:02,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:02,916 INFO L87 Difference]: Start difference. First operand 788 states and 1083 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 03:53:03,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:03,081 INFO L93 Difference]: Finished difference Result 882 states and 1197 transitions. [2021-11-23 03:53:03,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:03,081 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2021-11-23 03:53:03,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:03,085 INFO L225 Difference]: With dead ends: 882 [2021-11-23 03:53:03,085 INFO L226 Difference]: Without dead ends: 387 [2021-11-23 03:53:03,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:03,088 INFO L933 BasicCegarLoop]: 331 mSDtfsCounter, 24 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:03,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 635 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:03,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-23 03:53:03,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2021-11-23 03:53:03,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 322 states have (on average 1.5248447204968945) internal successors, (491), 325 states have internal predecessors, (491), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-23 03:53:03,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 593 transitions. [2021-11-23 03:53:03,114 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 593 transitions. Word has length 73 [2021-11-23 03:53:03,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:03,115 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 593 transitions. [2021-11-23 03:53:03,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-23 03:53:03,115 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 593 transitions. [2021-11-23 03:53:03,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:03,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:03,118 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:03,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:03,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:03,340 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:03,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:03,341 INFO L85 PathProgramCache]: Analyzing trace with hash 443236322, now seen corresponding path program 1 times [2021-11-23 03:53:03,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:03,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655982814] [2021-11-23 03:53:03,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:03,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:03,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:03,427 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:03,428 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:03,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655982814] [2021-11-23 03:53:03,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655982814] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:03,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052716785] [2021-11-23 03:53:03,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:03,429 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:03,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:03,430 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:03,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:53:03,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:03,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:03,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:03,901 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:53:03,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:03,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052716785] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:03,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:03,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:03,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327874905] [2021-11-23 03:53:03,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:03,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:03,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:03,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:03,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:03,904 INFO L87 Difference]: Start difference. First operand 387 states and 593 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:04,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:04,084 INFO L93 Difference]: Finished difference Result 1142 states and 1782 transitions. [2021-11-23 03:53:04,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:04,085 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:04,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:04,091 INFO L225 Difference]: With dead ends: 1142 [2021-11-23 03:53:04,091 INFO L226 Difference]: Without dead ends: 761 [2021-11-23 03:53:04,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:04,095 INFO L933 BasicCegarLoop]: 321 mSDtfsCounter, 266 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:04,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 569 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:04,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 761 states. [2021-11-23 03:53:04,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 761 to 755. [2021-11-23 03:53:04,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 634 states have (on average 1.523659305993691) internal successors, (966), 638 states have internal predecessors, (966), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-23 03:53:04,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 1156 transitions. [2021-11-23 03:53:04,147 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 1156 transitions. Word has length 144 [2021-11-23 03:53:04,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:04,148 INFO L470 AbstractCegarLoop]: Abstraction has 755 states and 1156 transitions. [2021-11-23 03:53:04,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:04,148 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 1156 transitions. [2021-11-23 03:53:04,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:04,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:04,157 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:04,192 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:04,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:04,376 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:04,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:04,377 INFO L85 PathProgramCache]: Analyzing trace with hash -543445984, now seen corresponding path program 1 times [2021-11-23 03:53:04,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:04,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [471986677] [2021-11-23 03:53:04,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:04,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:04,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:04,498 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:04,498 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:04,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [471986677] [2021-11-23 03:53:04,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [471986677] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:04,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045124967] [2021-11-23 03:53:04,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:04,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:04,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:04,500 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:04,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:53:04,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:04,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 1119 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:04,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:04,974 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 03:53:04,974 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:04,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045124967] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:04,974 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:04,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:04,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719529520] [2021-11-23 03:53:04,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:04,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:04,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:04,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:04,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:04,976 INFO L87 Difference]: Start difference. First operand 755 states and 1156 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:05,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:05,229 INFO L93 Difference]: Finished difference Result 2240 states and 3491 transitions. [2021-11-23 03:53:05,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:05,230 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:05,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:05,241 INFO L225 Difference]: With dead ends: 2240 [2021-11-23 03:53:05,241 INFO L226 Difference]: Without dead ends: 1491 [2021-11-23 03:53:05,245 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:05,246 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 278 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:05,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 568 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:53:05,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1491 states. [2021-11-23 03:53:05,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1491 to 1483. [2021-11-23 03:53:05,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1483 states, 1252 states have (on average 1.5207667731629393) internal successors, (1904), 1258 states have internal predecessors, (1904), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-23 03:53:05,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1483 states to 1483 states and 2266 transitions. [2021-11-23 03:53:05,350 INFO L78 Accepts]: Start accepts. Automaton has 1483 states and 2266 transitions. Word has length 144 [2021-11-23 03:53:05,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:05,351 INFO L470 AbstractCegarLoop]: Abstraction has 1483 states and 2266 transitions. [2021-11-23 03:53:05,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:05,351 INFO L276 IsEmpty]: Start isEmpty. Operand 1483 states and 2266 transitions. [2021-11-23 03:53:05,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:05,357 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:05,357 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:05,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:05,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 03:53:05,577 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:05,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:05,577 INFO L85 PathProgramCache]: Analyzing trace with hash 1732619102, now seen corresponding path program 1 times [2021-11-23 03:53:05,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:05,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599243397] [2021-11-23 03:53:05,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:05,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:05,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:05,654 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:05,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:05,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599243397] [2021-11-23 03:53:05,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599243397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:05,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660090677] [2021-11-23 03:53:05,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:05,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:05,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:05,657 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:05,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:53:05,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:05,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:05,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:06,150 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 03:53:06,151 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:06,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [660090677] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:06,151 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:06,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:06,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262351162] [2021-11-23 03:53:06,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:06,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:06,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:06,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:06,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:06,154 INFO L87 Difference]: Start difference. First operand 1483 states and 2266 transitions. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:06,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:06,448 INFO L93 Difference]: Finished difference Result 4412 states and 6859 transitions. [2021-11-23 03:53:06,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:06,449 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:06,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:06,471 INFO L225 Difference]: With dead ends: 4412 [2021-11-23 03:53:06,471 INFO L226 Difference]: Without dead ends: 2935 [2021-11-23 03:53:06,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:06,480 INFO L933 BasicCegarLoop]: 319 mSDtfsCounter, 281 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 567 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:06,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 567 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:06,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2935 states. [2021-11-23 03:53:06,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2935 to 2923. [2021-11-23 03:53:06,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2923 states, 2476 states have (on average 1.5169628432956381) internal successors, (3756), 2486 states have internal predecessors, (3756), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-23 03:53:06,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2923 states to 2923 states and 4454 transitions. [2021-11-23 03:53:06,688 INFO L78 Accepts]: Start accepts. Automaton has 2923 states and 4454 transitions. Word has length 144 [2021-11-23 03:53:06,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:06,688 INFO L470 AbstractCegarLoop]: Abstraction has 2923 states and 4454 transitions. [2021-11-23 03:53:06,688 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 2 states have internal predecessors, (92), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:06,689 INFO L276 IsEmpty]: Start isEmpty. Operand 2923 states and 4454 transitions. [2021-11-23 03:53:06,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:06,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:06,699 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:06,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:06,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:06,924 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:06,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:06,925 INFO L85 PathProgramCache]: Analyzing trace with hash -956073120, now seen corresponding path program 1 times [2021-11-23 03:53:06,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:06,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1322088918] [2021-11-23 03:53:06,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:06,925 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:06,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:07,009 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:07,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:07,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1322088918] [2021-11-23 03:53:07,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1322088918] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:07,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128704021] [2021-11-23 03:53:07,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:07,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:07,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:07,011 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:07,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:53:07,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:07,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 1107 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:07,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:07,529 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 03:53:07,529 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:07,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128704021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:07,530 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:07,530 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:07,530 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189180493] [2021-11-23 03:53:07,530 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:07,531 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:07,531 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:07,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:07,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:07,532 INFO L87 Difference]: Start difference. First operand 2923 states and 4454 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:07,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:07,978 INFO L93 Difference]: Finished difference Result 8708 states and 13495 transitions. [2021-11-23 03:53:07,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:07,979 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:07,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:08,030 INFO L225 Difference]: With dead ends: 8708 [2021-11-23 03:53:08,031 INFO L226 Difference]: Without dead ends: 5791 [2021-11-23 03:53:08,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:08,052 INFO L933 BasicCegarLoop]: 318 mSDtfsCounter, 287 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:08,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 566 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:08,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5791 states. [2021-11-23 03:53:08,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5791 to 5771. [2021-11-23 03:53:08,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5771 states, 4900 states have (on average 1.5126530612244897) internal successors, (7412), 4918 states have internal predecessors, (7412), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-23 03:53:08,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5771 states to 5771 states and 8766 transitions. [2021-11-23 03:53:08,498 INFO L78 Accepts]: Start accepts. Automaton has 5771 states and 8766 transitions. Word has length 144 [2021-11-23 03:53:08,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:08,498 INFO L470 AbstractCegarLoop]: Abstraction has 5771 states and 8766 transitions. [2021-11-23 03:53:08,498 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:08,499 INFO L276 IsEmpty]: Start isEmpty. Operand 5771 states and 8766 transitions. [2021-11-23 03:53:08,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:08,517 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:08,518 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:08,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:08,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:53:08,744 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:08,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:08,745 INFO L85 PathProgramCache]: Analyzing trace with hash 519160290, now seen corresponding path program 1 times [2021-11-23 03:53:08,745 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:08,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622661722] [2021-11-23 03:53:08,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:08,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:08,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:08,849 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:08,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:08,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622661722] [2021-11-23 03:53:08,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622661722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:08,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975571636] [2021-11-23 03:53:08,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:08,850 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:08,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:08,851 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:08,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:53:09,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:09,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 1101 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:09,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:09,317 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:53:09,318 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:09,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975571636] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:09,318 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:09,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:09,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149035168] [2021-11-23 03:53:09,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:09,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:09,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:09,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:09,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:09,320 INFO L87 Difference]: Start difference. First operand 5771 states and 8766 transitions. Second operand has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:10,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:10,098 INFO L93 Difference]: Finished difference Result 17204 states and 26567 transitions. [2021-11-23 03:53:10,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:10,099 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:10,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:10,188 INFO L225 Difference]: With dead ends: 17204 [2021-11-23 03:53:10,188 INFO L226 Difference]: Without dead ends: 11439 [2021-11-23 03:53:10,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:10,215 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 254 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:10,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 527 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:10,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11439 states. [2021-11-23 03:53:10,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11439 to 11403. [2021-11-23 03:53:11,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11403 states, 9700 states have (on average 1.508041237113402) internal successors, (14628), 9734 states have internal predecessors, (14628), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-23 03:53:11,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11403 states to 11403 states and 17262 transitions. [2021-11-23 03:53:11,072 INFO L78 Accepts]: Start accepts. Automaton has 11403 states and 17262 transitions. Word has length 144 [2021-11-23 03:53:11,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:11,072 INFO L470 AbstractCegarLoop]: Abstraction has 11403 states and 17262 transitions. [2021-11-23 03:53:11,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 39.666666666666664) internal successors, (119), 2 states have internal predecessors, (119), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:11,074 INFO L276 IsEmpty]: Start isEmpty. Operand 11403 states and 17262 transitions. [2021-11-23 03:53:11,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:11,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:11,103 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:11,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:11,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:53:11,329 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:11,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:11,329 INFO L85 PathProgramCache]: Analyzing trace with hash -836494560, now seen corresponding path program 1 times [2021-11-23 03:53:11,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:11,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802481933] [2021-11-23 03:53:11,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:11,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:11,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:11,414 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:11,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:11,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802481933] [2021-11-23 03:53:11,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802481933] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:11,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141093158] [2021-11-23 03:53:11,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:11,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:11,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:11,417 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:11,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:53:11,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:11,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 1095 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:11,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 03:53:11,912 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:11,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141093158] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:11,912 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:11,912 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:11,913 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265385189] [2021-11-23 03:53:11,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:11,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:11,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:11,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:11,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:11,914 INFO L87 Difference]: Start difference. First operand 11403 states and 17262 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:13,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:13,239 INFO L93 Difference]: Finished difference Result 34004 states and 52311 transitions. [2021-11-23 03:53:13,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:13,242 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:13,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:13,354 INFO L225 Difference]: With dead ends: 34004 [2021-11-23 03:53:13,354 INFO L226 Difference]: Without dead ends: 22607 [2021-11-23 03:53:13,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:13,406 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 260 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:13,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 527 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:13,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22607 states. [2021-11-23 03:53:14,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22607 to 22539. [2021-11-23 03:53:14,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22539 states, 19204 states have (on average 1.5032284940637368) internal successors, (28868), 19270 states have internal predecessors, (28868), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-23 03:53:15,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22539 states to 22539 states and 33998 transitions. [2021-11-23 03:53:15,016 INFO L78 Accepts]: Start accepts. Automaton has 22539 states and 33998 transitions. Word has length 144 [2021-11-23 03:53:15,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:15,017 INFO L470 AbstractCegarLoop]: Abstraction has 22539 states and 33998 transitions. [2021-11-23 03:53:15,017 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:15,017 INFO L276 IsEmpty]: Start isEmpty. Operand 22539 states and 33998 transitions. [2021-11-23 03:53:15,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:15,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:15,070 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:15,110 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:15,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:53:15,284 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:15,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:15,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1439560226, now seen corresponding path program 1 times [2021-11-23 03:53:15,285 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:15,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051504935] [2021-11-23 03:53:15,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:15,286 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:15,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:15,373 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:53:15,374 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:15,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051504935] [2021-11-23 03:53:15,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051504935] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:15,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1398675390] [2021-11-23 03:53:15,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:15,375 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:15,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:15,376 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:15,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:53:15,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:15,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 1089 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:15,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:15,860 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:53:15,860 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:15,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1398675390] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:15,860 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:15,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:53:15,861 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486104863] [2021-11-23 03:53:15,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:15,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:15,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:15,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:15,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:15,862 INFO L87 Difference]: Start difference. First operand 22539 states and 33998 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:17,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:17,937 INFO L93 Difference]: Finished difference Result 67220 states and 102999 transitions. [2021-11-23 03:53:17,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:17,938 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 144 [2021-11-23 03:53:17,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:18,189 INFO L225 Difference]: With dead ends: 67220 [2021-11-23 03:53:18,190 INFO L226 Difference]: Without dead ends: 44687 [2021-11-23 03:53:18,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:18,281 INFO L933 BasicCegarLoop]: 279 mSDtfsCounter, 272 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 527 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:18,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [272 Valid, 527 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:18,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44687 states. [2021-11-23 03:53:20,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44687 to 44555. [2021-11-23 03:53:20,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44555 states, 38020 states have (on average 1.498264071541294) internal successors, (56964), 38150 states have internal predecessors, (56964), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-23 03:53:20,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44555 states to 44555 states and 66958 transitions. [2021-11-23 03:53:20,949 INFO L78 Accepts]: Start accepts. Automaton has 44555 states and 66958 transitions. Word has length 144 [2021-11-23 03:53:20,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:20,949 INFO L470 AbstractCegarLoop]: Abstraction has 44555 states and 66958 transitions. [2021-11-23 03:53:20,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:53:20,950 INFO L276 IsEmpty]: Start isEmpty. Operand 44555 states and 66958 transitions. [2021-11-23 03:53:21,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-23 03:53:21,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:21,034 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:21,075 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:21,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:53:21,260 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:21,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:21,261 INFO L85 PathProgramCache]: Analyzing trace with hash -1138502756, now seen corresponding path program 1 times [2021-11-23 03:53:21,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:21,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065145014] [2021-11-23 03:53:21,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:21,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:21,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:21,414 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-23 03:53:21,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:21,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065145014] [2021-11-23 03:53:21,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065145014] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:21,415 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:53:21,415 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:53:21,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848985768] [2021-11-23 03:53:21,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:21,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:53:21,419 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:21,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:53:21,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:21,420 INFO L87 Difference]: Start difference. First operand 44555 states and 66958 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:53:26,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:26,877 INFO L93 Difference]: Finished difference Result 156435 states and 234773 transitions. [2021-11-23 03:53:26,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 03:53:26,878 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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 144 [2021-11-23 03:53:26,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:27,606 INFO L225 Difference]: With dead ends: 156435 [2021-11-23 03:53:27,606 INFO L226 Difference]: Without dead ends: 111887 [2021-11-23 03:53:27,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:53:27,911 INFO L933 BasicCegarLoop]: 282 mSDtfsCounter, 1237 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1259 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:27,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1259 Valid, 786 Invalid, 474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:53:28,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111887 states. [2021-11-23 03:53:33,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111887 to 87563. [2021-11-23 03:53:33,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87563 states, 74756 states have (on average 1.4931242977152335) internal successors, (111620), 75014 states have internal predecessors, (111620), 9734 states have call successors, (9734), 3073 states have call predecessors, (9734), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-23 03:53:33,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87563 states to 87563 states and 131086 transitions. [2021-11-23 03:53:33,978 INFO L78 Accepts]: Start accepts. Automaton has 87563 states and 131086 transitions. Word has length 144 [2021-11-23 03:53:33,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:33,979 INFO L470 AbstractCegarLoop]: Abstraction has 87563 states and 131086 transitions. [2021-11-23 03:53:33,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:53:33,980 INFO L276 IsEmpty]: Start isEmpty. Operand 87563 states and 131086 transitions. [2021-11-23 03:53:34,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-11-23 03:53:34,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:34,095 INFO L514 BasicCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:34,095 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 03:53:34,095 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:34,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:34,096 INFO L85 PathProgramCache]: Analyzing trace with hash -90586509, now seen corresponding path program 1 times [2021-11-23 03:53:34,096 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:34,096 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36519547] [2021-11-23 03:53:34,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:34,097 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:34,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:34,237 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 44 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:53:34,237 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:34,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36519547] [2021-11-23 03:53:34,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36519547] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:34,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300325541] [2021-11-23 03:53:34,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:34,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:34,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:34,241 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:34,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:53:34,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:34,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:34,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:34,689 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-11-23 03:53:34,690 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:34,690 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300325541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:34,690 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:34,690 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:53:34,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610145305] [2021-11-23 03:53:34,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:34,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:34,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:34,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:34,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:53:34,693 INFO L87 Difference]: Start difference. First operand 87563 states and 131086 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (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) [2021-11-23 03:53:39,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:39,595 INFO L93 Difference]: Finished difference Result 155535 states and 236945 transitions. [2021-11-23 03:53:39,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:53:39,596 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (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 167 [2021-11-23 03:53:39,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:40,242 INFO L225 Difference]: With dead ends: 155535 [2021-11-23 03:53:40,242 INFO L226 Difference]: Without dead ends: 110731 [2021-11-23 03:53:40,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:53:40,732 INFO L933 BasicCegarLoop]: 397 mSDtfsCounter, 134 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 668 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:40,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 668 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:40,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110731 states. [2021-11-23 03:53:46,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110731 to 104587. [2021-11-23 03:53:46,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104587 states, 91268 states have (on average 1.537143358022527) internal successors, (140292), 91526 states have internal predecessors, (140292), 9990 states have call successors, (9990), 3329 states have call predecessors, (9990), 3328 states have return successors, (9988), 9732 states have call predecessors, (9988), 9988 states have call successors, (9988) [2021-11-23 03:53:46,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104587 states to 104587 states and 160270 transitions. [2021-11-23 03:53:46,586 INFO L78 Accepts]: Start accepts. Automaton has 104587 states and 160270 transitions. Word has length 167 [2021-11-23 03:53:46,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:46,587 INFO L470 AbstractCegarLoop]: Abstraction has 104587 states and 160270 transitions. [2021-11-23 03:53:46,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (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) [2021-11-23 03:53:46,588 INFO L276 IsEmpty]: Start isEmpty. Operand 104587 states and 160270 transitions. [2021-11-23 03:53:46,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2021-11-23 03:53:46,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:46,967 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 03:53:47,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:53:47,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:47,181 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:47,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:47,181 INFO L85 PathProgramCache]: Analyzing trace with hash -768438825, now seen corresponding path program 1 times [2021-11-23 03:53:47,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:47,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874015490] [2021-11-23 03:53:47,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:47,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:47,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:47,313 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 10 proven. 87 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-23 03:53:47,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:47,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874015490] [2021-11-23 03:53:47,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874015490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:53:47,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41062370] [2021-11-23 03:53:47,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:47,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:53:47,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:47,317 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:53:47,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1a1e9097-bc23-4360-9751-9a79ce7b4de8/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:53:47,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:47,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 1407 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:53:47,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:53:47,994 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 03:53:47,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:53:47,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41062370] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:47,995 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:53:47,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2021-11-23 03:53:47,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854720373] [2021-11-23 03:53:47,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:47,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:53:47,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:47,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:53:47,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:53:47,998 INFO L87 Difference]: Start difference. First operand 104587 states and 160270 transitions. Second operand has 3 states, 3 states have (on average 46.666666666666664) internal successors, (140), 2 states have internal predecessors, (140), 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)