./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version dbf71c69 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta --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 4ea93d7c6d06d46004840cc5fcb436c7c307334e6ee754b8ee507b78f644445d --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-dbf71c6-m [2022-10-17 17:40:16,546 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-10-17 17:40:16,549 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-10-17 17:40:16,581 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-10-17 17:40:16,583 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-10-17 17:40:16,589 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-10-17 17:40:16,592 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-10-17 17:40:16,597 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-10-17 17:40:16,601 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-10-17 17:40:16,603 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-10-17 17:40:16,604 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-10-17 17:40:16,606 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-10-17 17:40:16,608 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-10-17 17:40:16,611 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-10-17 17:40:16,613 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-10-17 17:40:16,616 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-10-17 17:40:16,618 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-10-17 17:40:16,622 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-10-17 17:40:16,624 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-10-17 17:40:16,626 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-10-17 17:40:16,627 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-10-17 17:40:16,629 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-10-17 17:40:16,630 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-10-17 17:40:16,631 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-10-17 17:40:16,636 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-10-17 17:40:16,636 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-10-17 17:40:16,637 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-10-17 17:40:16,638 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-10-17 17:40:16,638 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-10-17 17:40:16,640 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-10-17 17:40:16,640 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-10-17 17:40:16,641 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-10-17 17:40:16,642 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-10-17 17:40:16,643 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-10-17 17:40:16,644 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-10-17 17:40:16,644 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-10-17 17:40:16,645 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-10-17 17:40:16,646 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-10-17 17:40:16,646 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-10-17 17:40:16,647 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-10-17 17:40:16,648 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-10-17 17:40:16,649 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-10-17 17:40:16,679 INFO L113 SettingsManager]: Loading preferences was successful [2022-10-17 17:40:16,679 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-10-17 17:40:16,679 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-10-17 17:40:16,680 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-10-17 17:40:16,680 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-10-17 17:40:16,681 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-10-17 17:40:16,681 INFO L138 SettingsManager]: * User list type=DISABLED [2022-10-17 17:40:16,681 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-10-17 17:40:16,681 INFO L138 SettingsManager]: * Explicit value domain=true [2022-10-17 17:40:16,681 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-10-17 17:40:16,681 INFO L138 SettingsManager]: * Octagon Domain=false [2022-10-17 17:40:16,682 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-10-17 17:40:16,682 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-10-17 17:40:16,682 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-10-17 17:40:16,682 INFO L138 SettingsManager]: * Interval Domain=false [2022-10-17 17:40:16,682 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-10-17 17:40:16,683 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-10-17 17:40:16,683 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-10-17 17:40:16,684 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-10-17 17:40:16,684 INFO L138 SettingsManager]: * sizeof long=4 [2022-10-17 17:40:16,684 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-10-17 17:40:16,684 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-10-17 17:40:16,684 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-10-17 17:40:16,684 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-10-17 17:40:16,685 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-10-17 17:40:16,685 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-10-17 17:40:16,685 INFO L138 SettingsManager]: * sizeof long double=12 [2022-10-17 17:40:16,685 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-10-17 17:40:16,685 INFO L138 SettingsManager]: * Use constant arrays=true [2022-10-17 17:40:16,686 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-10-17 17:40:16,686 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-10-17 17:40:16,689 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-10-17 17:40:16,689 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:40:16,690 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-10-17 17:40:16,690 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-10-17 17:40:16,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-10-17 17:40:16,691 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-10-17 17:40:16,691 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-10-17 17:40:16,691 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-10-17 17:40:16,691 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-10-17 17:40:16,692 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-10-17 17:40:16,692 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ea93d7c6d06d46004840cc5fcb436c7c307334e6ee754b8ee507b78f644445d [2022-10-17 17:40:16,979 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-10-17 17:40:17,003 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-10-17 17:40:17,005 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-10-17 17:40:17,007 INFO L271 PluginConnector]: Initializing CDTParser... [2022-10-17 17:40:17,008 INFO L275 PluginConnector]: CDTParser initialized [2022-10-17 17:40:17,009 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/../../sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c [2022-10-17 17:40:17,071 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/data/1946a4d7e/afb9e903f1444234b9652e2f38836129/FLAGad1801bb7 [2022-10-17 17:40:17,534 INFO L306 CDTParser]: Found 1 translation units. [2022-10-17 17:40:17,535 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c [2022-10-17 17:40:17,560 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/data/1946a4d7e/afb9e903f1444234b9652e2f38836129/FLAGad1801bb7 [2022-10-17 17:40:18,067 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/data/1946a4d7e/afb9e903f1444234b9652e2f38836129 [2022-10-17 17:40:18,069 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-10-17 17:40:18,071 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-10-17 17:40:18,081 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-10-17 17:40:18,082 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-10-17 17:40:18,085 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-10-17 17:40:18,086 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,088 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@761c0b99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18, skipping insertion in model container [2022-10-17 17:40:18,088 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,095 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-10-17 17:40:18,143 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-10-17 17:40:18,316 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_a59a617d-f487-4b0a-bc4c-55c3b069759e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c[914,927] [2022-10-17 17:40:18,397 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_a59a617d-f487-4b0a-bc4c-55c3b069759e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c[7115,7128] [2022-10-17 17:40:18,466 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:40:18,476 INFO L203 MainTranslator]: Completed pre-run [2022-10-17 17:40:18,489 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_a59a617d-f487-4b0a-bc4c-55c3b069759e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c[914,927] [2022-10-17 17:40:18,509 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_a59a617d-f487-4b0a-bc4c-55c3b069759e/sv-benchmarks/c/combinations/pc_sfifo_2.cil-1+token_ring.02.cil-2.c[7115,7128] [2022-10-17 17:40:18,533 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-10-17 17:40:18,553 INFO L208 MainTranslator]: Completed translation [2022-10-17 17:40:18,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18 WrapperNode [2022-10-17 17:40:18,554 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-10-17 17:40:18,555 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-10-17 17:40:18,556 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-10-17 17:40:18,556 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-10-17 17:40:18,574 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,586 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,621 INFO L138 Inliner]: procedures = 57, calls = 64, calls flagged for inlining = 25, calls inlined = 25, statements flattened = 465 [2022-10-17 17:40:18,622 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-10-17 17:40:18,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-10-17 17:40:18,623 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-10-17 17:40:18,623 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-10-17 17:40:18,632 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,632 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,637 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,637 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,647 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,657 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,661 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,669 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-10-17 17:40:18,670 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-10-17 17:40:18,670 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-10-17 17:40:18,671 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-10-17 17:40:18,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (1/1) ... [2022-10-17 17:40:18,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-10-17 17:40:18,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:18,704 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-10-17 17:40:18,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-10-17 17:40:18,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-10-17 17:40:18,753 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2022-10-17 17:40:18,753 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2022-10-17 17:40:18,753 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2022-10-17 17:40:18,753 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2022-10-17 17:40:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2022-10-17 17:40:18,754 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2022-10-17 17:40:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2022-10-17 17:40:18,754 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2022-10-17 17:40:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events1 [2022-10-17 17:40:18,754 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events1 [2022-10-17 17:40:18,754 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2022-10-17 17:40:18,755 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2022-10-17 17:40:18,755 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2022-10-17 17:40:18,755 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2022-10-17 17:40:18,755 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads1 [2022-10-17 17:40:18,755 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads1 [2022-10-17 17:40:18,755 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2022-10-17 17:40:18,756 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2022-10-17 17:40:18,756 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels1 [2022-10-17 17:40:18,756 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels1 [2022-10-17 17:40:18,756 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2022-10-17 17:40:18,756 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2022-10-17 17:40:18,756 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-10-17 17:40:18,756 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2022-10-17 17:40:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2022-10-17 17:40:18,757 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events1 [2022-10-17 17:40:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events1 [2022-10-17 17:40:18,757 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-10-17 17:40:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-10-17 17:40:18,757 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2022-10-17 17:40:18,757 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2022-10-17 17:40:18,758 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2022-10-17 17:40:18,758 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2022-10-17 17:40:18,885 INFO L235 CfgBuilder]: Building ICFG [2022-10-17 17:40:18,903 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-10-17 17:40:19,606 INFO L276 CfgBuilder]: Performing block encoding [2022-10-17 17:40:19,879 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-10-17 17:40:19,879 INFO L300 CfgBuilder]: Removed 9 assume(true) statements. [2022-10-17 17:40:19,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:40:19 BoogieIcfgContainer [2022-10-17 17:40:19,883 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-10-17 17:40:19,888 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-10-17 17:40:19,889 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-10-17 17:40:19,893 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-10-17 17:40:19,894 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 05:40:18" (1/3) ... [2022-10-17 17:40:19,895 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c3e913 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:40:19, skipping insertion in model container [2022-10-17 17:40:19,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 05:40:18" (2/3) ... [2022-10-17 17:40:19,897 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c3e913 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 05:40:19, skipping insertion in model container [2022-10-17 17:40:19,897 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 05:40:19" (3/3) ... [2022-10-17 17:40:19,898 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_2.cil-1+token_ring.02.cil-2.c [2022-10-17 17:40:19,920 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-10-17 17:40:19,920 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2022-10-17 17:40:20,014 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-10-17 17:40:20,033 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@54794c06, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-10-17 17:40:20,033 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2022-10-17 17:40:20,038 INFO L276 IsEmpty]: Start isEmpty. Operand has 156 states, 106 states have (on average 1.5) internal successors, (159), 114 states have internal predecessors, (159), 32 states have call successors, (32), 15 states have call predecessors, (32), 15 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2022-10-17 17:40:20,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-10-17 17:40:20,051 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:20,051 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:20,052 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:20,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:20,058 INFO L85 PathProgramCache]: Analyzing trace with hash 625245629, now seen corresponding path program 1 times [2022-10-17 17:40:20,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:20,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90089918] [2022-10-17 17:40:20,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:20,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:20,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:20,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:20,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:20,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90089918] [2022-10-17 17:40:20,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90089918] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:20,575 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:20,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-10-17 17:40:20,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581517328] [2022-10-17 17:40:20,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:20,584 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-10-17 17:40:20,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:20,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-10-17 17:40:20,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-10-17 17:40:20,616 INFO L87 Difference]: Start difference. First operand has 156 states, 106 states have (on average 1.5) internal successors, (159), 114 states have internal predecessors, (159), 32 states have call successors, (32), 15 states have call predecessors, (32), 15 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) Second operand has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-10-17 17:40:21,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:21,426 INFO L93 Difference]: Finished difference Result 573 states and 853 transitions. [2022-10-17 17:40:21,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-10-17 17:40:21,429 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 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 38 [2022-10-17 17:40:21,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:21,456 INFO L225 Difference]: With dead ends: 573 [2022-10-17 17:40:21,456 INFO L226 Difference]: Without dead ends: 412 [2022-10-17 17:40:21,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-10-17 17:40:21,476 INFO L413 NwaCegarLoop]: 280 mSDtfsCounter, 545 mSDsluCounter, 411 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 603 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:21,478 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [552 Valid, 603 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 17:40:21,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-10-17 17:40:21,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 399. [2022-10-17 17:40:21,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 283 states have (on average 1.3886925795053005) internal successors, (393), 291 states have internal predecessors, (393), 77 states have call successors, (77), 39 states have call predecessors, (77), 37 states have return successors, (95), 70 states have call predecessors, (95), 73 states have call successors, (95) [2022-10-17 17:40:21,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 565 transitions. [2022-10-17 17:40:21,605 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 565 transitions. Word has length 38 [2022-10-17 17:40:21,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:21,606 INFO L495 AbstractCegarLoop]: Abstraction has 399 states and 565 transitions. [2022-10-17 17:40:21,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.4) internal successors, (27), 5 states have internal predecessors, (27), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-10-17 17:40:21,606 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 565 transitions. [2022-10-17 17:40:21,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-10-17 17:40:21,609 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:21,610 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:21,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-10-17 17:40:21,610 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:21,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:21,611 INFO L85 PathProgramCache]: Analyzing trace with hash -2082638090, now seen corresponding path program 1 times [2022-10-17 17:40:21,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:21,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56396689] [2022-10-17 17:40:21,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:21,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:21,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:21,742 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:21,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:21,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56396689] [2022-10-17 17:40:21,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56396689] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:21,743 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:21,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-10-17 17:40:21,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524435093] [2022-10-17 17:40:21,743 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:21,744 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:40:21,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:21,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:40:21,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:21,746 INFO L87 Difference]: Start difference. First operand 399 states and 565 transitions. Second operand has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-10-17 17:40:22,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:22,502 INFO L93 Difference]: Finished difference Result 874 states and 1195 transitions. [2022-10-17 17:40:22,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-10-17 17:40:22,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 45 [2022-10-17 17:40:22,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:22,518 INFO L225 Difference]: With dead ends: 874 [2022-10-17 17:40:22,518 INFO L226 Difference]: Without dead ends: 810 [2022-10-17 17:40:22,522 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-10-17 17:40:22,524 INFO L413 NwaCegarLoop]: 329 mSDtfsCounter, 730 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 294 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 739 SdHoareTripleChecker+Valid, 811 SdHoareTripleChecker+Invalid, 879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 294 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:22,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [739 Valid, 811 Invalid, 879 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [294 Valid, 585 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-10-17 17:40:22,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2022-10-17 17:40:22,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 739. [2022-10-17 17:40:22,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 739 states, 520 states have (on average 1.3307692307692307) internal successors, (692), 528 states have internal predecessors, (692), 132 states have call successors, (132), 87 states have call predecessors, (132), 85 states have return successors, (165), 125 states have call predecessors, (165), 128 states have call successors, (165) [2022-10-17 17:40:22,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 739 states to 739 states and 989 transitions. [2022-10-17 17:40:22,673 INFO L78 Accepts]: Start accepts. Automaton has 739 states and 989 transitions. Word has length 45 [2022-10-17 17:40:22,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:22,674 INFO L495 AbstractCegarLoop]: Abstraction has 739 states and 989 transitions. [2022-10-17 17:40:22,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.0) internal successors, (30), 6 states have internal predecessors, (30), 4 states have call successors, (8), 2 states have call predecessors, (8), 4 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-10-17 17:40:22,675 INFO L276 IsEmpty]: Start isEmpty. Operand 739 states and 989 transitions. [2022-10-17 17:40:22,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-10-17 17:40:22,684 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:22,685 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:22,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-10-17 17:40:22,685 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:22,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:22,691 INFO L85 PathProgramCache]: Analyzing trace with hash -128609907, now seen corresponding path program 1 times [2022-10-17 17:40:22,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:22,691 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773935152] [2022-10-17 17:40:22,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:22,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:22,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:22,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:22,964 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:22,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773935152] [2022-10-17 17:40:22,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773935152] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:22,964 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:22,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-10-17 17:40:22,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438167851] [2022-10-17 17:40:22,965 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:22,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:40:22,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:22,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:40:22,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-10-17 17:40:22,966 INFO L87 Difference]: Start difference. First operand 739 states and 989 transitions. Second operand has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-10-17 17:40:23,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:23,606 INFO L93 Difference]: Finished difference Result 1500 states and 1936 transitions. [2022-10-17 17:40:23,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-10-17 17:40:23,607 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2022-10-17 17:40:23,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:23,616 INFO L225 Difference]: With dead ends: 1500 [2022-10-17 17:40:23,617 INFO L226 Difference]: Without dead ends: 1097 [2022-10-17 17:40:23,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-10-17 17:40:23,628 INFO L413 NwaCegarLoop]: 165 mSDtfsCounter, 315 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:23,629 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 588 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:40:23,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1097 states. [2022-10-17 17:40:23,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1097 to 1068. [2022-10-17 17:40:23,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1068 states, 743 states have (on average 1.2960969044414536) internal successors, (963), 752 states have internal predecessors, (963), 188 states have call successors, (188), 135 states have call predecessors, (188), 135 states have return successors, (239), 182 states have call predecessors, (239), 184 states have call successors, (239) [2022-10-17 17:40:23,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1068 states to 1068 states and 1390 transitions. [2022-10-17 17:40:23,816 INFO L78 Accepts]: Start accepts. Automaton has 1068 states and 1390 transitions. Word has length 46 [2022-10-17 17:40:23,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:23,816 INFO L495 AbstractCegarLoop]: Abstraction has 1068 states and 1390 transitions. [2022-10-17 17:40:23,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-10-17 17:40:23,817 INFO L276 IsEmpty]: Start isEmpty. Operand 1068 states and 1390 transitions. [2022-10-17 17:40:23,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-10-17 17:40:23,818 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:23,819 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:23,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-10-17 17:40:23,819 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:23,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:23,820 INFO L85 PathProgramCache]: Analyzing trace with hash 991298271, now seen corresponding path program 1 times [2022-10-17 17:40:23,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:23,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073515430] [2022-10-17 17:40:23,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:23,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:23,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:23,872 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:23,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:23,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073515430] [2022-10-17 17:40:23,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073515430] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:23,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:23,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:23,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80566721] [2022-10-17 17:40:23,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:23,874 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:23,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:23,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:23,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:23,876 INFO L87 Difference]: Start difference. First operand 1068 states and 1390 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-10-17 17:40:24,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:24,105 INFO L93 Difference]: Finished difference Result 2009 states and 2549 transitions. [2022-10-17 17:40:24,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:24,106 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2022-10-17 17:40:24,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:24,115 INFO L225 Difference]: With dead ends: 2009 [2022-10-17 17:40:24,115 INFO L226 Difference]: Without dead ends: 1327 [2022-10-17 17:40:24,118 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:24,128 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 68 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:24,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 337 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:24,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2022-10-17 17:40:24,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 1305. [2022-10-17 17:40:24,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1305 states, 904 states have (on average 1.279867256637168) internal successors, (1157), 913 states have internal predecessors, (1157), 230 states have call successors, (230), 173 states have call predecessors, (230), 169 states have return successors, (285), 220 states have call predecessors, (285), 226 states have call successors, (285) [2022-10-17 17:40:24,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1305 states to 1305 states and 1672 transitions. [2022-10-17 17:40:24,321 INFO L78 Accepts]: Start accepts. Automaton has 1305 states and 1672 transitions. Word has length 47 [2022-10-17 17:40:24,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:24,323 INFO L495 AbstractCegarLoop]: Abstraction has 1305 states and 1672 transitions. [2022-10-17 17:40:24,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-10-17 17:40:24,323 INFO L276 IsEmpty]: Start isEmpty. Operand 1305 states and 1672 transitions. [2022-10-17 17:40:24,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-10-17 17:40:24,325 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:24,325 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:24,327 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-10-17 17:40:24,328 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:24,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:24,329 INFO L85 PathProgramCache]: Analyzing trace with hash -32616359, now seen corresponding path program 1 times [2022-10-17 17:40:24,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:24,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946289767] [2022-10-17 17:40:24,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:24,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:24,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:24,410 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-10-17 17:40:24,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:24,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946289767] [2022-10-17 17:40:24,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946289767] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:24,411 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:24,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:24,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623887383] [2022-10-17 17:40:24,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:24,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:24,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:24,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:24,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:24,413 INFO L87 Difference]: Start difference. First operand 1305 states and 1672 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-10-17 17:40:24,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:24,646 INFO L93 Difference]: Finished difference Result 1711 states and 2162 transitions. [2022-10-17 17:40:24,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:24,647 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 53 [2022-10-17 17:40:24,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:24,655 INFO L225 Difference]: With dead ends: 1711 [2022-10-17 17:40:24,655 INFO L226 Difference]: Without dead ends: 1156 [2022-10-17 17:40:24,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:24,659 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 175 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:24,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 246 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:24,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1156 states. [2022-10-17 17:40:24,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1156 to 950. [2022-10-17 17:40:24,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 950 states, 668 states have (on average 1.278443113772455) internal successors, (854), 676 states have internal predecessors, (854), 167 states have call successors, (167), 119 states have call predecessors, (167), 113 states have return successors, (193), 156 states have call predecessors, (193), 163 states have call successors, (193) [2022-10-17 17:40:24,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 950 states to 950 states and 1214 transitions. [2022-10-17 17:40:24,798 INFO L78 Accepts]: Start accepts. Automaton has 950 states and 1214 transitions. Word has length 53 [2022-10-17 17:40:24,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:24,798 INFO L495 AbstractCegarLoop]: Abstraction has 950 states and 1214 transitions. [2022-10-17 17:40:24,798 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-10-17 17:40:24,799 INFO L276 IsEmpty]: Start isEmpty. Operand 950 states and 1214 transitions. [2022-10-17 17:40:24,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-10-17 17:40:24,801 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:24,801 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:24,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-10-17 17:40:24,802 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:24,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:24,802 INFO L85 PathProgramCache]: Analyzing trace with hash -1641230165, now seen corresponding path program 1 times [2022-10-17 17:40:24,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:24,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944958022] [2022-10-17 17:40:24,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:24,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:24,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:24,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:24,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:24,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944958022] [2022-10-17 17:40:24,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944958022] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:24,926 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:24,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-10-17 17:40:24,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644169442] [2022-10-17 17:40:24,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:24,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-10-17 17:40:24,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:24,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-10-17 17:40:24,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-10-17 17:40:24,929 INFO L87 Difference]: Start difference. First operand 950 states and 1214 transitions. Second operand has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2022-10-17 17:40:25,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:25,252 INFO L93 Difference]: Finished difference Result 1205 states and 1515 transitions. [2022-10-17 17:40:25,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-10-17 17:40:25,253 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 54 [2022-10-17 17:40:25,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:25,263 INFO L225 Difference]: With dead ends: 1205 [2022-10-17 17:40:25,263 INFO L226 Difference]: Without dead ends: 1202 [2022-10-17 17:40:25,264 INFO L412 NwaCegarLoop]: 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 [2022-10-17 17:40:25,265 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 325 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:25,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 225 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-10-17 17:40:25,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1202 states. [2022-10-17 17:40:25,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1202 to 949. [2022-10-17 17:40:25,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 949 states, 668 states have (on average 1.2694610778443114) internal successors, (848), 675 states have internal predecessors, (848), 166 states have call successors, (166), 119 states have call predecessors, (166), 113 states have return successors, (193), 156 states have call predecessors, (193), 163 states have call successors, (193) [2022-10-17 17:40:25,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 949 states to 949 states and 1207 transitions. [2022-10-17 17:40:25,402 INFO L78 Accepts]: Start accepts. Automaton has 949 states and 1207 transitions. Word has length 54 [2022-10-17 17:40:25,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:25,403 INFO L495 AbstractCegarLoop]: Abstraction has 949 states and 1207 transitions. [2022-10-17 17:40:25,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.75) internal successors, (39), 4 states have internal predecessors, (39), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2022-10-17 17:40:25,403 INFO L276 IsEmpty]: Start isEmpty. Operand 949 states and 1207 transitions. [2022-10-17 17:40:25,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-10-17 17:40:25,405 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:25,405 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:25,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-10-17 17:40:25,405 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:25,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:25,406 INFO L85 PathProgramCache]: Analyzing trace with hash 660744648, now seen corresponding path program 1 times [2022-10-17 17:40:25,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:25,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568235217] [2022-10-17 17:40:25,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:25,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:25,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:25,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:25,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:25,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568235217] [2022-10-17 17:40:25,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568235217] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:40:25,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678542281] [2022-10-17 17:40:25,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:25,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:25,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:25,567 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:25,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-10-17 17:40:25,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:25,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 9 conjunts are in the unsatisfiable core [2022-10-17 17:40:25,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:26,065 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:26,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-10-17 17:40:26,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:26,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678542281] provided 0 perfect and 2 imperfect interpolant sequences [2022-10-17 17:40:26,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029928762] [2022-10-17 17:40:26,266 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2022-10-17 17:40:26,266 INFO L166 IcfgInterpreter]: Building call graph [2022-10-17 17:40:26,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-10-17 17:40:26,276 INFO L176 IcfgInterpreter]: Starting interpretation [2022-10-17 17:40:26,277 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-10-17 17:40:28,713 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events1 with input of size 105 for LOIs [2022-10-17 17:40:28,733 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 73 for LOIs [2022-10-17 17:40:28,740 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 101 for LOIs [2022-10-17 17:40:28,756 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads1 with input of size 109 for LOIs [2022-10-17 17:40:29,056 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_write_p_triggered with input of size 105 for LOIs [2022-10-17 17:40:29,122 INFO L197 IcfgInterpreter]: Interpreting procedure is_do_read_c_triggered with input of size 105 for LOIs [2022-10-17 17:40:29,163 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events1 with input of size 105 for LOIs [2022-10-17 17:40:29,182 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels1 with input of size 112 for LOIs [2022-10-17 17:40:29,201 INFO L180 IcfgInterpreter]: Interpretation finished [2022-10-17 17:40:37,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20209#(and (= ~q_req_up~0 1) (= ~t1_pc~0 0) (= ~T1_E~0 2) (= ~m_st~0 0) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~t2_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~p_dw_pc~0 1) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (= ~local~0 0) (= ~token~0 0) (= ~c_dr_pc~0 0) (= 2 ~p_dw_st~0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= ~E_1~0 2) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~c_dr_st~0 1) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2022-10-17 17:40:37,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-10-17 17:40:37,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-10-17 17:40:37,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2022-10-17 17:40:37,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251737353] [2022-10-17 17:40:37,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-10-17 17:40:37,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-10-17 17:40:37,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:37,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-10-17 17:40:37,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2022-10-17 17:40:37,680 INFO L87 Difference]: Start difference. First operand 949 states and 1207 transitions. Second operand has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 7 states have internal predecessors, (79), 4 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2022-10-17 17:40:38,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:38,383 INFO L93 Difference]: Finished difference Result 2179 states and 2658 transitions. [2022-10-17 17:40:38,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-10-17 17:40:38,384 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 7 states have internal predecessors, (79), 4 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) Word has length 55 [2022-10-17 17:40:38,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:38,403 INFO L225 Difference]: With dead ends: 2179 [2022-10-17 17:40:38,404 INFO L226 Difference]: Without dead ends: 2176 [2022-10-17 17:40:38,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=203, Invalid=1867, Unknown=0, NotChecked=0, Total=2070 [2022-10-17 17:40:38,406 INFO L413 NwaCegarLoop]: 296 mSDtfsCounter, 541 mSDsluCounter, 689 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 541 SdHoareTripleChecker+Valid, 837 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:38,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [541 Valid, 837 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:40:38,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2176 states. [2022-10-17 17:40:38,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2176 to 1769. [2022-10-17 17:40:38,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1769 states, 1231 states have (on average 1.2380178716490657) internal successors, (1524), 1238 states have internal predecessors, (1524), 306 states have call successors, (306), 244 states have call predecessors, (306), 230 states have return successors, (345), 288 states have call predecessors, (345), 303 states have call successors, (345) [2022-10-17 17:40:38,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1769 states to 1769 states and 2175 transitions. [2022-10-17 17:40:38,632 INFO L78 Accepts]: Start accepts. Automaton has 1769 states and 2175 transitions. Word has length 55 [2022-10-17 17:40:38,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:38,633 INFO L495 AbstractCegarLoop]: Abstraction has 1769 states and 2175 transitions. [2022-10-17 17:40:38,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 11.285714285714286) internal successors, (79), 7 states have internal predecessors, (79), 4 states have call successors, (20), 3 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2022-10-17 17:40:38,633 INFO L276 IsEmpty]: Start isEmpty. Operand 1769 states and 2175 transitions. [2022-10-17 17:40:38,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-10-17 17:40:38,635 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:38,635 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:38,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-10-17 17:40:38,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:38,850 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:38,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:38,850 INFO L85 PathProgramCache]: Analyzing trace with hash -512300437, now seen corresponding path program 2 times [2022-10-17 17:40:38,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:38,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363131821] [2022-10-17 17:40:38,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:38,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:38,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:38,903 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-10-17 17:40:38,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:38,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363131821] [2022-10-17 17:40:38,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363131821] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:38,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:38,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:38,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87875513] [2022-10-17 17:40:38,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:38,905 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:38,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:38,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:38,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:38,906 INFO L87 Difference]: Start difference. First operand 1769 states and 2175 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2022-10-17 17:40:39,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:39,141 INFO L93 Difference]: Finished difference Result 2461 states and 2985 transitions. [2022-10-17 17:40:39,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:39,142 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 58 [2022-10-17 17:40:39,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:39,152 INFO L225 Difference]: With dead ends: 2461 [2022-10-17 17:40:39,152 INFO L226 Difference]: Without dead ends: 1315 [2022-10-17 17:40:39,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:39,156 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 180 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:39,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 283 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:39,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1315 states. [2022-10-17 17:40:39,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1315 to 1305. [2022-10-17 17:40:39,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1305 states, 919 states have (on average 1.2328618063112078) internal successors, (1133), 926 states have internal predecessors, (1133), 222 states have call successors, (222), 168 states have call predecessors, (222), 162 states have return successors, (253), 212 states have call predecessors, (253), 219 states have call successors, (253) [2022-10-17 17:40:39,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1305 states to 1305 states and 1608 transitions. [2022-10-17 17:40:39,330 INFO L78 Accepts]: Start accepts. Automaton has 1305 states and 1608 transitions. Word has length 58 [2022-10-17 17:40:39,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:39,330 INFO L495 AbstractCegarLoop]: Abstraction has 1305 states and 1608 transitions. [2022-10-17 17:40:39,330 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2022-10-17 17:40:39,330 INFO L276 IsEmpty]: Start isEmpty. Operand 1305 states and 1608 transitions. [2022-10-17 17:40:39,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-10-17 17:40:39,332 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:39,333 INFO L195 NwaCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:39,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-10-17 17:40:39,333 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:39,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:39,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1909104559, now seen corresponding path program 1 times [2022-10-17 17:40:39,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:39,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634186370] [2022-10-17 17:40:39,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:39,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:39,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:39,377 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-10-17 17:40:39,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:39,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634186370] [2022-10-17 17:40:39,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1634186370] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:39,378 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:39,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:39,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369773665] [2022-10-17 17:40:39,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:39,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:39,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:39,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:39,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:39,380 INFO L87 Difference]: Start difference. First operand 1305 states and 1608 transitions. Second operand has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-10-17 17:40:39,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:39,629 INFO L93 Difference]: Finished difference Result 2145 states and 2584 transitions. [2022-10-17 17:40:39,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:39,630 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 61 [2022-10-17 17:40:39,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:39,641 INFO L225 Difference]: With dead ends: 2145 [2022-10-17 17:40:39,641 INFO L226 Difference]: Without dead ends: 1623 [2022-10-17 17:40:39,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:39,644 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 43 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:39,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 373 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:39,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1623 states. [2022-10-17 17:40:39,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1623 to 1458. [2022-10-17 17:40:39,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1458 states, 1026 states have (on average 1.2251461988304093) internal successors, (1257), 1037 states have internal predecessors, (1257), 247 states have call successors, (247), 193 states have call predecessors, (247), 183 states have return successors, (278), 229 states have call predecessors, (278), 244 states have call successors, (278) [2022-10-17 17:40:39,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1458 states to 1458 states and 1782 transitions. [2022-10-17 17:40:39,844 INFO L78 Accepts]: Start accepts. Automaton has 1458 states and 1782 transitions. Word has length 61 [2022-10-17 17:40:39,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:39,845 INFO L495 AbstractCegarLoop]: Abstraction has 1458 states and 1782 transitions. [2022-10-17 17:40:39,845 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-10-17 17:40:39,845 INFO L276 IsEmpty]: Start isEmpty. Operand 1458 states and 1782 transitions. [2022-10-17 17:40:39,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-10-17 17:40:39,847 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:39,848 INFO L195 NwaCegarLoop]: trace histogram [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] [2022-10-17 17:40:39,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-10-17 17:40:39,848 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:39,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:39,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1564239491, now seen corresponding path program 1 times [2022-10-17 17:40:39,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:39,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177029069] [2022-10-17 17:40:39,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:39,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:39,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:40,117 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-10-17 17:40:40,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:40,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177029069] [2022-10-17 17:40:40,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177029069] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:40,118 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:40,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-10-17 17:40:40,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526961973] [2022-10-17 17:40:40,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:40,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:40:40,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:40,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:40:40,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:40,120 INFO L87 Difference]: Start difference. First operand 1458 states and 1782 transitions. Second operand has 6 states, 6 states have (on average 6.5) internal successors, (39), 6 states have internal predecessors, (39), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-10-17 17:40:40,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:40,702 INFO L93 Difference]: Finished difference Result 1994 states and 2575 transitions. [2022-10-17 17:40:40,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-10-17 17:40:40,703 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.5) internal successors, (39), 6 states have internal predecessors, (39), 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 67 [2022-10-17 17:40:40,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:40,714 INFO L225 Difference]: With dead ends: 1994 [2022-10-17 17:40:40,714 INFO L226 Difference]: Without dead ends: 1670 [2022-10-17 17:40:40,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2022-10-17 17:40:40,717 INFO L413 NwaCegarLoop]: 189 mSDtfsCounter, 329 mSDsluCounter, 406 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:40,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 537 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-10-17 17:40:40,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1670 states. [2022-10-17 17:40:40,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1670 to 1638. [2022-10-17 17:40:40,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1638 states, 1155 states have (on average 1.2372294372294372) internal successors, (1429), 1168 states have internal predecessors, (1429), 280 states have call successors, (280), 211 states have call predecessors, (280), 201 states have return successors, (326), 260 states have call predecessors, (326), 277 states have call successors, (326) [2022-10-17 17:40:40,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1638 states to 1638 states and 2035 transitions. [2022-10-17 17:40:40,953 INFO L78 Accepts]: Start accepts. Automaton has 1638 states and 2035 transitions. Word has length 67 [2022-10-17 17:40:40,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:40,955 INFO L495 AbstractCegarLoop]: Abstraction has 1638 states and 2035 transitions. [2022-10-17 17:40:40,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.5) internal successors, (39), 6 states have internal predecessors, (39), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-10-17 17:40:40,955 INFO L276 IsEmpty]: Start isEmpty. Operand 1638 states and 2035 transitions. [2022-10-17 17:40:40,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-10-17 17:40:40,958 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:40,958 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:40,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-10-17 17:40:40,959 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:40,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:40,960 INFO L85 PathProgramCache]: Analyzing trace with hash -223801190, now seen corresponding path program 1 times [2022-10-17 17:40:40,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:40,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868620593] [2022-10-17 17:40:40,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:40,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:40,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:41,021 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-10-17 17:40:41,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:41,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868620593] [2022-10-17 17:40:41,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868620593] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:41,024 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:41,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:41,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288088880] [2022-10-17 17:40:41,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:41,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:41,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:41,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:41,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:41,026 INFO L87 Difference]: Start difference. First operand 1638 states and 2035 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-10-17 17:40:41,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:41,311 INFO L93 Difference]: Finished difference Result 2187 states and 2839 transitions. [2022-10-17 17:40:41,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:41,311 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 68 [2022-10-17 17:40:41,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:41,324 INFO L225 Difference]: With dead ends: 2187 [2022-10-17 17:40:41,324 INFO L226 Difference]: Without dead ends: 1745 [2022-10-17 17:40:41,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:41,327 INFO L413 NwaCegarLoop]: 208 mSDtfsCounter, 37 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:41,328 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 377 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:41,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1745 states. [2022-10-17 17:40:41,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1745 to 1684. [2022-10-17 17:40:41,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1684 states, 1195 states have (on average 1.2476987447698744) internal successors, (1491), 1208 states have internal predecessors, (1491), 283 states have call successors, (283), 214 states have call predecessors, (283), 204 states have return successors, (329), 263 states have call predecessors, (329), 280 states have call successors, (329) [2022-10-17 17:40:41,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1684 states to 1684 states and 2103 transitions. [2022-10-17 17:40:41,580 INFO L78 Accepts]: Start accepts. Automaton has 1684 states and 2103 transitions. Word has length 68 [2022-10-17 17:40:41,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:41,580 INFO L495 AbstractCegarLoop]: Abstraction has 1684 states and 2103 transitions. [2022-10-17 17:40:41,581 INFO L496 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-10-17 17:40:41,581 INFO L276 IsEmpty]: Start isEmpty. Operand 1684 states and 2103 transitions. [2022-10-17 17:40:41,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-10-17 17:40:41,583 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:41,583 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:41,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-10-17 17:40:41,584 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:41,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:41,585 INFO L85 PathProgramCache]: Analyzing trace with hash 511962874, now seen corresponding path program 1 times [2022-10-17 17:40:41,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:41,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686867794] [2022-10-17 17:40:41,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:41,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:41,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:41,743 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-10-17 17:40:41,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:41,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686867794] [2022-10-17 17:40:41,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686867794] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:41,743 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:41,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-10-17 17:40:41,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778026662] [2022-10-17 17:40:41,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:41,744 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-10-17 17:40:41,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:41,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-10-17 17:40:41,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-10-17 17:40:41,745 INFO L87 Difference]: Start difference. First operand 1684 states and 2103 transitions. Second operand has 8 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-10-17 17:40:42,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:42,557 INFO L93 Difference]: Finished difference Result 3274 states and 3928 transitions. [2022-10-17 17:40:42,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-10-17 17:40:42,558 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 70 [2022-10-17 17:40:42,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:42,572 INFO L225 Difference]: With dead ends: 3274 [2022-10-17 17:40:42,572 INFO L226 Difference]: Without dead ends: 2152 [2022-10-17 17:40:42,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2022-10-17 17:40:42,577 INFO L413 NwaCegarLoop]: 158 mSDtfsCounter, 295 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 315 SdHoareTripleChecker+Valid, 570 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:42,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [315 Valid, 570 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-10-17 17:40:42,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2152 states. [2022-10-17 17:40:42,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2152 to 2045. [2022-10-17 17:40:42,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2045 states, 1436 states have (on average 1.2207520891364902) internal successors, (1753), 1449 states have internal predecessors, (1753), 347 states have call successors, (347), 270 states have call predecessors, (347), 260 states have return successors, (393), 327 states have call predecessors, (393), 344 states have call successors, (393) [2022-10-17 17:40:42,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2045 states to 2045 states and 2493 transitions. [2022-10-17 17:40:42,920 INFO L78 Accepts]: Start accepts. Automaton has 2045 states and 2493 transitions. Word has length 70 [2022-10-17 17:40:42,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:42,920 INFO L495 AbstractCegarLoop]: Abstraction has 2045 states and 2493 transitions. [2022-10-17 17:40:42,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-10-17 17:40:42,921 INFO L276 IsEmpty]: Start isEmpty. Operand 2045 states and 2493 transitions. [2022-10-17 17:40:42,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-10-17 17:40:42,923 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:42,924 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:42,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-10-17 17:40:42,924 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:42,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:42,926 INFO L85 PathProgramCache]: Analyzing trace with hash -630364273, now seen corresponding path program 1 times [2022-10-17 17:40:42,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:42,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919184304] [2022-10-17 17:40:42,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:42,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:42,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:42,983 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-10-17 17:40:42,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:42,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919184304] [2022-10-17 17:40:42,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919184304] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:42,984 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:42,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:42,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810414306] [2022-10-17 17:40:42,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:42,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:42,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:42,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:42,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:42,986 INFO L87 Difference]: Start difference. First operand 2045 states and 2493 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-10-17 17:40:43,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:43,352 INFO L93 Difference]: Finished difference Result 3642 states and 4321 transitions. [2022-10-17 17:40:43,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:43,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 71 [2022-10-17 17:40:43,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:43,367 INFO L225 Difference]: With dead ends: 3642 [2022-10-17 17:40:43,367 INFO L226 Difference]: Without dead ends: 2263 [2022-10-17 17:40:43,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:43,372 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 38 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:43,373 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 367 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:43,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2263 states. [2022-10-17 17:40:43,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2263 to 2182. [2022-10-17 17:40:43,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2182 states, 1533 states have (on average 1.2165688193085453) internal successors, (1865), 1552 states have internal predecessors, (1865), 368 states have call successors, (368), 291 states have call predecessors, (368), 279 states have return successors, (420), 340 states have call predecessors, (420), 365 states have call successors, (420) [2022-10-17 17:40:43,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2182 states to 2182 states and 2653 transitions. [2022-10-17 17:40:43,725 INFO L78 Accepts]: Start accepts. Automaton has 2182 states and 2653 transitions. Word has length 71 [2022-10-17 17:40:43,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:43,725 INFO L495 AbstractCegarLoop]: Abstraction has 2182 states and 2653 transitions. [2022-10-17 17:40:43,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-10-17 17:40:43,726 INFO L276 IsEmpty]: Start isEmpty. Operand 2182 states and 2653 transitions. [2022-10-17 17:40:43,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-10-17 17:40:43,730 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:43,730 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:43,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-10-17 17:40:43,731 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:43,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:43,731 INFO L85 PathProgramCache]: Analyzing trace with hash -859123262, now seen corresponding path program 1 times [2022-10-17 17:40:43,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:43,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930755808] [2022-10-17 17:40:43,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:43,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:43,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:43,786 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-10-17 17:40:43,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:43,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930755808] [2022-10-17 17:40:43,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930755808] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:43,787 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-10-17 17:40:43,787 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-10-17 17:40:43,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422692424] [2022-10-17 17:40:43,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:43,788 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:43,788 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:43,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:43,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:43,789 INFO L87 Difference]: Start difference. First operand 2182 states and 2653 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-10-17 17:40:44,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:44,282 INFO L93 Difference]: Finished difference Result 3248 states and 4221 transitions. [2022-10-17 17:40:44,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-10-17 17:40:44,283 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 88 [2022-10-17 17:40:44,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:44,302 INFO L225 Difference]: With dead ends: 3248 [2022-10-17 17:40:44,302 INFO L226 Difference]: Without dead ends: 2697 [2022-10-17 17:40:44,306 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-10-17 17:40:44,307 INFO L413 NwaCegarLoop]: 179 mSDtfsCounter, 169 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:44,307 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 262 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:44,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2697 states. [2022-10-17 17:40:44,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2697 to 2682. [2022-10-17 17:40:44,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2682 states, 1897 states have (on average 1.2377438060094887) internal successors, (2348), 1921 states have internal predecessors, (2348), 453 states have call successors, (453), 342 states have call predecessors, (453), 330 states have return successors, (535), 420 states have call predecessors, (535), 450 states have call successors, (535) [2022-10-17 17:40:44,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2682 states to 2682 states and 3336 transitions. [2022-10-17 17:40:44,836 INFO L78 Accepts]: Start accepts. Automaton has 2682 states and 3336 transitions. Word has length 88 [2022-10-17 17:40:44,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:44,837 INFO L495 AbstractCegarLoop]: Abstraction has 2682 states and 3336 transitions. [2022-10-17 17:40:44,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-10-17 17:40:44,837 INFO L276 IsEmpty]: Start isEmpty. Operand 2682 states and 3336 transitions. [2022-10-17 17:40:44,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-10-17 17:40:44,843 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:44,843 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:44,843 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-10-17 17:40:44,844 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:44,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:44,844 INFO L85 PathProgramCache]: Analyzing trace with hash 1397488118, now seen corresponding path program 1 times [2022-10-17 17:40:44,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:44,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266862183] [2022-10-17 17:40:44,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:44,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:44,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:45,288 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 15 proven. 13 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-10-17 17:40:45,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:45,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266862183] [2022-10-17 17:40:45,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266862183] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:40:45,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364302427] [2022-10-17 17:40:45,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:45,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:45,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:45,293 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:45,317 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-10-17 17:40:45,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:45,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 13 conjunts are in the unsatisfiable core [2022-10-17 17:40:45,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:45,495 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-10-17 17:40:45,495 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:40:45,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364302427] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:45,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:40:45,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [14] total 17 [2022-10-17 17:40:45,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638987333] [2022-10-17 17:40:45,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:45,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-10-17 17:40:45,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:45,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-10-17 17:40:45,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-10-17 17:40:45,505 INFO L87 Difference]: Start difference. First operand 2682 states and 3336 transitions. Second operand has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2022-10-17 17:40:46,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-10-17 17:40:46,085 INFO L93 Difference]: Finished difference Result 4086 states and 4997 transitions. [2022-10-17 17:40:46,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-10-17 17:40:46,094 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 102 [2022-10-17 17:40:46,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-10-17 17:40:46,120 INFO L225 Difference]: With dead ends: 4086 [2022-10-17 17:40:46,120 INFO L226 Difference]: Without dead ends: 2466 [2022-10-17 17:40:46,127 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2022-10-17 17:40:46,128 INFO L413 NwaCegarLoop]: 216 mSDtfsCounter, 172 mSDsluCounter, 679 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 798 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-10-17 17:40:46,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 798 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-10-17 17:40:46,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2466 states. [2022-10-17 17:40:46,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2466 to 2177. [2022-10-17 17:40:46,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2177 states, 1582 states have (on average 1.259165613147914) internal successors, (1992), 1604 states have internal predecessors, (1992), 349 states have call successors, (349), 252 states have call predecessors, (349), 244 states have return successors, (425), 322 states have call predecessors, (425), 346 states have call successors, (425) [2022-10-17 17:40:46,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2177 states to 2177 states and 2766 transitions. [2022-10-17 17:40:46,540 INFO L78 Accepts]: Start accepts. Automaton has 2177 states and 2766 transitions. Word has length 102 [2022-10-17 17:40:46,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-10-17 17:40:46,541 INFO L495 AbstractCegarLoop]: Abstraction has 2177 states and 2766 transitions. [2022-10-17 17:40:46,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 13.6) internal successors, (68), 5 states have internal predecessors, (68), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2022-10-17 17:40:46,541 INFO L276 IsEmpty]: Start isEmpty. Operand 2177 states and 2766 transitions. [2022-10-17 17:40:46,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-10-17 17:40:46,551 INFO L187 NwaCegarLoop]: Found error trace [2022-10-17 17:40:46,551 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-10-17 17:40:46,591 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-10-17 17:40:46,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-10-17 17:40:46,765 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-10-17 17:40:46,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-10-17 17:40:46,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1445437574, now seen corresponding path program 1 times [2022-10-17 17:40:46,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-10-17 17:40:46,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701442310] [2022-10-17 17:40:46,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:46,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-10-17 17:40:46,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:46,902 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-10-17 17:40:46,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-10-17 17:40:46,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701442310] [2022-10-17 17:40:46,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701442310] provided 0 perfect and 1 imperfect interpolant sequences [2022-10-17 17:40:46,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221363484] [2022-10-17 17:40:46,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-10-17 17:40:46,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-10-17 17:40:46,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 [2022-10-17 17:40:46,905 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-10-17 17:40:46,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a59a617d-f487-4b0a-bc4c-55c3b069759e/bin/utaipan-G1rejxKTta/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-10-17 17:40:47,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-10-17 17:40:47,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 2 conjunts are in the unsatisfiable core [2022-10-17 17:40:47,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-10-17 17:40:47,109 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-10-17 17:40:47,110 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-10-17 17:40:47,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [221363484] provided 1 perfect and 0 imperfect interpolant sequences [2022-10-17 17:40:47,110 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-10-17 17:40:47,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2022-10-17 17:40:47,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810285864] [2022-10-17 17:40:47,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-10-17 17:40:47,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-10-17 17:40:47,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-10-17 17:40:47,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-10-17 17:40:47,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-10-17 17:40:47,113 INFO L87 Difference]: Start difference. First operand 2177 states and 2766 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)