./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d94a0143393d3950a5bf091072c53e220b7412d84326b758d723e55ee9dd42c8 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:34:18,788 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:34:18,790 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:34:18,829 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:34:18,830 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:34:18,833 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:34:18,836 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:34:18,841 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:34:18,843 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:34:18,849 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:34:18,850 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:34:18,852 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:34:18,852 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:34:18,855 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:34:18,858 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:34:18,860 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:34:18,865 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:34:18,866 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:34:18,868 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:34:18,871 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:34:18,872 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:34:18,875 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:34:18,879 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:34:18,880 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:34:18,888 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:34:18,892 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:34:18,893 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:34:18,894 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:34:18,896 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:34:18,897 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:34:18,898 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:34:18,899 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:34:18,901 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:34:18,902 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:34:18,904 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:34:18,905 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:34:18,905 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:34:18,906 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:34:18,906 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:34:18,907 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:34:18,908 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:34:18,909 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:34:18,960 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:34:18,960 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:34:18,961 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:34:18,961 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:34:18,962 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:34:18,962 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:34:18,962 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:34:18,963 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:34:18,963 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:34:18,963 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:34:18,964 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:34:18,965 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:34:18,965 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:34:18,965 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:34:18,965 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:34:18,966 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:34:18,966 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:34:18,966 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:34:18,967 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:34:18,968 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:34:18,968 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:34:18,968 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:34:18,968 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:34:18,969 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:34:18,969 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:34:18,969 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:34:18,969 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:34:18,970 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:34:18,970 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:34:18,970 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:34:18,970 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:34:18,971 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:34:18,971 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:34:18,971 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:34:18,971 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:34:18,972 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:34:18,972 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:34:18,972 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:34:18,972 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:34:18,972 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:34:18,973 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:34:18,973 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d94a0143393d3950a5bf091072c53e220b7412d84326b758d723e55ee9dd42c8 [2021-11-23 02:34:19,244 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:34:19,268 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:34:19,271 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:34:19,272 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:34:19,273 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:34:19,274 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c [2021-11-23 02:34:19,370 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/data/43df7d42b/87c53a71e2c54cc997679ad51489ca13/FLAG0f8039031 [2021-11-23 02:34:20,421 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:34:20,422 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c [2021-11-23 02:34:20,479 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/data/43df7d42b/87c53a71e2c54cc997679ad51489ca13/FLAG0f8039031 [2021-11-23 02:34:20,722 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/data/43df7d42b/87c53a71e2c54cc997679ad51489ca13 [2021-11-23 02:34:20,724 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:34:20,726 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:34:20,730 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:34:20,730 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:34:20,734 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:34:20,735 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:34:20" (1/1) ... [2021-11-23 02:34:20,736 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c2ac588 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:20, skipping insertion in model container [2021-11-23 02:34:20,737 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:34:20" (1/1) ... [2021-11-23 02:34:20,744 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:34:21,025 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:34:23,314 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_63180079-ff4b-4a72-8f5a-b4890a5ad234/sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c[375709,375722] [2021-11-23 02:34:23,359 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_63180079-ff4b-4a72-8f5a-b4890a5ad234/sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c[383339,383352] [2021-11-23 02:34:23,643 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:34:23,653 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:34:24,949 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_63180079-ff4b-4a72-8f5a-b4890a5ad234/sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c[375709,375722] [2021-11-23 02:34:24,960 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_63180079-ff4b-4a72-8f5a-b4890a5ad234/sv-benchmarks/c/combinations/Problem05_label48+token_ring.05.cil-1.c[383339,383352] [2021-11-23 02:34:24,975 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:34:25,054 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:34:25,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25 WrapperNode [2021-11-23 02:34:25,054 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:34:25,056 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:34:25,056 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:34:25,056 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:34:25,064 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:25,188 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:25,704 INFO L137 Inliner]: procedures = 54, calls = 56, calls flagged for inlining = 32, calls inlined = 32, statements flattened = 12793 [2021-11-23 02:34:25,705 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:34:25,706 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:34:25,706 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:34:25,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:34:25,720 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:25,733 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:25,864 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:25,865 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:26,140 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:26,203 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:26,225 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:26,289 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:34:26,290 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:34:26,290 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:34:26,291 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:34:26,292 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (1/1) ... [2021-11-23 02:34:26,300 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:34:26,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:26,327 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:34:26,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:34:26,384 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:34:26,384 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 02:34:26,385 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 02:34:26,385 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:34:26,385 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:34:26,385 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 02:34:26,385 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 02:34:26,385 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 02:34:26,386 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 02:34:26,386 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 02:34:26,386 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 02:34:26,386 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 02:34:26,386 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 02:34:26,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:34:26,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:34:26,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:34:26,541 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:34:26,543 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:34:34,328 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:34:36,299 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:34:36,299 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-23 02:34:36,305 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:34:36 BoogieIcfgContainer [2021-11-23 02:34:36,305 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:34:36,307 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:34:36,308 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:34:36,311 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:34:36,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:34:20" (1/3) ... [2021-11-23 02:34:36,312 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60f2cd7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:34:36, skipping insertion in model container [2021-11-23 02:34:36,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:34:25" (2/3) ... [2021-11-23 02:34:36,312 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60f2cd7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:34:36, skipping insertion in model container [2021-11-23 02:34:36,313 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:34:36" (3/3) ... [2021-11-23 02:34:36,314 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label48+token_ring.05.cil-1.c [2021-11-23 02:34:36,320 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:34:36,320 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:34:36,386 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:34:36,395 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:34:36,395 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:34:36,563 INFO L276 IsEmpty]: Start isEmpty. Operand has 1754 states, 1726 states have (on average 1.97045191193511) internal successors, (3401), 1729 states have internal predecessors, (3401), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-23 02:34:36,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:34:36,573 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:36,573 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:36,574 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:36,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:36,580 INFO L85 PathProgramCache]: Analyzing trace with hash 211636638, now seen corresponding path program 1 times [2021-11-23 02:34:36,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:36,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295302270] [2021-11-23 02:34:36,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:36,591 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:36,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:36,988 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:34:36,989 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:36,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295302270] [2021-11-23 02:34:36,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295302270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:36,990 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:36,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:34:36,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504712002] [2021-11-23 02:34:36,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:36,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:34:36,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:37,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:34:37,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:34:37,068 INFO L87 Difference]: Start difference. First operand has 1754 states, 1726 states have (on average 1.97045191193511) internal successors, (3401), 1729 states have internal predecessors, (3401), 19 states have call successors, (19), 6 states have call predecessors, (19), 6 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:34:38,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:38,096 INFO L93 Difference]: Finished difference Result 3602 states and 7035 transitions. [2021-11-23 02:34:38,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:34:38,099 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 46 [2021-11-23 02:34:38,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:38,136 INFO L225 Difference]: With dead ends: 3602 [2021-11-23 02:34:38,136 INFO L226 Difference]: Without dead ends: 1847 [2021-11-23 02:34:38,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:34:38,157 INFO L933 BasicCegarLoop]: 3301 mSDtfsCounter, 3548 mSDsluCounter, 3497 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3548 SdHoareTripleChecker+Valid, 6532 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:38,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3548 Valid, 6532 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:34:38,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1847 states. [2021-11-23 02:34:38,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1847 to 1846. [2021-11-23 02:34:38,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1846 states, 1798 states have (on average 1.9443826473859844) internal successors, (3496), 1801 states have internal predecessors, (3496), 34 states have call successors, (34), 12 states have call predecessors, (34), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 02:34:38,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1846 states to 1846 states and 3564 transitions. [2021-11-23 02:34:38,337 INFO L78 Accepts]: Start accepts. Automaton has 1846 states and 3564 transitions. Word has length 46 [2021-11-23 02:34:38,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:38,337 INFO L470 AbstractCegarLoop]: Abstraction has 1846 states and 3564 transitions. [2021-11-23 02:34:38,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:34:38,338 INFO L276 IsEmpty]: Start isEmpty. Operand 1846 states and 3564 transitions. [2021-11-23 02:34:38,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:34:38,344 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:38,345 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:38,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:34:38,346 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:38,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:38,347 INFO L85 PathProgramCache]: Analyzing trace with hash -797941317, now seen corresponding path program 1 times [2021-11-23 02:34:38,347 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:38,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214096229] [2021-11-23 02:34:38,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:38,348 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:38,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:38,535 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:34:38,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:38,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214096229] [2021-11-23 02:34:38,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [214096229] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:38,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513375104] [2021-11-23 02:34:38,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:38,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:38,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:38,545 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:38,565 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:34:38,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:38,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:34:38,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:38,928 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:34:38,930 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:38,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513375104] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:38,936 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:34:38,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:34:38,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954590599] [2021-11-23 02:34:38,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:38,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:38,939 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:38,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:38,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:38,946 INFO L87 Difference]: Start difference. First operand 1846 states and 3564 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:34:39,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:39,387 INFO L93 Difference]: Finished difference Result 2239 states and 4145 transitions. [2021-11-23 02:34:39,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:39,388 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2021-11-23 02:34:39,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:39,406 INFO L225 Difference]: With dead ends: 2239 [2021-11-23 02:34:39,406 INFO L226 Difference]: Without dead ends: 2039 [2021-11-23 02:34:39,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:39,410 INFO L933 BasicCegarLoop]: 3224 mSDtfsCounter, 3393 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3393 SdHoareTripleChecker+Valid, 3344 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:39,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3393 Valid, 3344 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:39,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2039 states. [2021-11-23 02:34:39,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2039 to 2035. [2021-11-23 02:34:39,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2035 states, 1947 states have (on average 1.9049820236260915) internal successors, (3709), 1951 states have internal predecessors, (3709), 62 states have call successors, (62), 24 states have call predecessors, (62), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2021-11-23 02:34:39,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2035 states to 2035 states and 3833 transitions. [2021-11-23 02:34:39,509 INFO L78 Accepts]: Start accepts. Automaton has 2035 states and 3833 transitions. Word has length 87 [2021-11-23 02:34:39,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:39,510 INFO L470 AbstractCegarLoop]: Abstraction has 2035 states and 3833 transitions. [2021-11-23 02:34:39,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:34:39,510 INFO L276 IsEmpty]: Start isEmpty. Operand 2035 states and 3833 transitions. [2021-11-23 02:34:39,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:34:39,516 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:39,516 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:39,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:39,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:39,730 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:39,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:39,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1827013187, now seen corresponding path program 1 times [2021-11-23 02:34:39,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:39,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090986242] [2021-11-23 02:34:39,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:39,731 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:39,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:39,822 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:34:39,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:39,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090986242] [2021-11-23 02:34:39,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090986242] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:39,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140441733] [2021-11-23 02:34:39,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:39,824 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:39,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:39,826 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:39,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:34:39,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:39,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 558 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:34:39,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:40,108 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:34:40,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:40,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140441733] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:40,109 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:34:40,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:34:40,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758061346] [2021-11-23 02:34:40,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:40,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:40,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:40,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:40,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:40,114 INFO L87 Difference]: Start difference. First operand 2035 states and 3833 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:34:40,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:40,574 INFO L93 Difference]: Finished difference Result 2800 states and 4956 transitions. [2021-11-23 02:34:40,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:40,575 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2021-11-23 02:34:40,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:40,596 INFO L225 Difference]: With dead ends: 2800 [2021-11-23 02:34:40,596 INFO L226 Difference]: Without dead ends: 2411 [2021-11-23 02:34:40,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:40,603 INFO L933 BasicCegarLoop]: 3223 mSDtfsCounter, 3402 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3402 SdHoareTripleChecker+Valid, 3343 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:40,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3402 Valid, 3343 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:40,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2411 states. [2021-11-23 02:34:40,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2411 to 2405. [2021-11-23 02:34:40,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2405 states, 2239 states have (on average 1.8414470745868692) internal successors, (4123), 2245 states have internal predecessors, (4123), 116 states have call successors, (116), 48 states have call predecessors, (116), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2021-11-23 02:34:40,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2405 states to 2405 states and 4355 transitions. [2021-11-23 02:34:40,747 INFO L78 Accepts]: Start accepts. Automaton has 2405 states and 4355 transitions. Word has length 87 [2021-11-23 02:34:40,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:40,749 INFO L470 AbstractCegarLoop]: Abstraction has 2405 states and 4355 transitions. [2021-11-23 02:34:40,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:34:40,750 INFO L276 IsEmpty]: Start isEmpty. Operand 2405 states and 4355 transitions. [2021-11-23 02:34:40,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:34:40,755 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:40,755 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:40,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:40,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-23 02:34:40,970 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:40,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:40,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1746060283, now seen corresponding path program 1 times [2021-11-23 02:34:40,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:40,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404577421] [2021-11-23 02:34:40,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:40,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:41,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:41,121 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:34:41,121 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:41,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404577421] [2021-11-23 02:34:41,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404577421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:41,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123767016] [2021-11-23 02:34:41,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:41,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:41,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:41,133 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:41,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:34:41,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:41,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:34:41,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:41,429 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:34:41,429 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:41,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123767016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:41,430 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:34:41,430 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:34:41,430 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370038997] [2021-11-23 02:34:41,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:41,431 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:41,431 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:41,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:41,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:41,432 INFO L87 Difference]: Start difference. First operand 2405 states and 4355 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:34:41,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:41,941 INFO L93 Difference]: Finished difference Result 3898 states and 6528 transitions. [2021-11-23 02:34:41,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:41,945 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 87 [2021-11-23 02:34:41,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:41,971 INFO L225 Difference]: With dead ends: 3898 [2021-11-23 02:34:41,971 INFO L226 Difference]: Without dead ends: 3139 [2021-11-23 02:34:41,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:41,978 INFO L933 BasicCegarLoop]: 3198 mSDtfsCounter, 3399 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3399 SdHoareTripleChecker+Valid, 3318 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:41,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3399 Valid, 3318 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:34:41,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3139 states. [2021-11-23 02:34:42,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3139 to 3129. [2021-11-23 02:34:42,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3129 states, 2811 states have (on average 1.7527570259694059) internal successors, (4927), 2821 states have internal predecessors, (4927), 220 states have call successors, (220), 96 states have call predecessors, (220), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2021-11-23 02:34:42,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3129 states to 3129 states and 5367 transitions. [2021-11-23 02:34:42,156 INFO L78 Accepts]: Start accepts. Automaton has 3129 states and 5367 transitions. Word has length 87 [2021-11-23 02:34:42,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:42,156 INFO L470 AbstractCegarLoop]: Abstraction has 3129 states and 5367 transitions. [2021-11-23 02:34:42,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:34:42,157 INFO L276 IsEmpty]: Start isEmpty. Operand 3129 states and 5367 transitions. [2021-11-23 02:34:42,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 02:34:42,162 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:42,162 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:42,199 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:42,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:42,378 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:42,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:42,378 INFO L85 PathProgramCache]: Analyzing trace with hash 2112083581, now seen corresponding path program 1 times [2021-11-23 02:34:42,379 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:42,379 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194608710] [2021-11-23 02:34:42,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:42,379 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:42,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:42,560 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 02:34:42,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:42,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194608710] [2021-11-23 02:34:42,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194608710] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:42,561 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:42,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:34:42,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484071815] [2021-11-23 02:34:42,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:42,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:42,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:42,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:42,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:34:42,565 INFO L87 Difference]: Start difference. First operand 3129 states and 5367 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:34:43,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:43,122 INFO L93 Difference]: Finished difference Result 4283 states and 7048 transitions. [2021-11-23 02:34:43,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:43,123 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 87 [2021-11-23 02:34:43,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:43,150 INFO L225 Difference]: With dead ends: 4283 [2021-11-23 02:34:43,151 INFO L226 Difference]: Without dead ends: 3521 [2021-11-23 02:34:43,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:34:43,156 INFO L933 BasicCegarLoop]: 3252 mSDtfsCounter, 64 mSDsluCounter, 3425 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 6442 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:43,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 6442 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:34:43,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3521 states. [2021-11-23 02:34:43,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3521 to 3373. [2021-11-23 02:34:43,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3373 states, 3039 states have (on average 1.7476143468246133) internal successors, (5311), 3049 states have internal predecessors, (5311), 228 states have call successors, (228), 104 states have call predecessors, (228), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2021-11-23 02:34:43,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3373 states to 3373 states and 5767 transitions. [2021-11-23 02:34:43,311 INFO L78 Accepts]: Start accepts. Automaton has 3373 states and 5767 transitions. Word has length 87 [2021-11-23 02:34:43,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:43,314 INFO L470 AbstractCegarLoop]: Abstraction has 3373 states and 5767 transitions. [2021-11-23 02:34:43,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 02:34:43,314 INFO L276 IsEmpty]: Start isEmpty. Operand 3373 states and 5767 transitions. [2021-11-23 02:34:43,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 02:34:43,325 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:43,327 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:43,327 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:34:43,327 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:43,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:43,329 INFO L85 PathProgramCache]: Analyzing trace with hash 2003411347, now seen corresponding path program 1 times [2021-11-23 02:34:43,329 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:43,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118278813] [2021-11-23 02:34:43,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:43,330 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:43,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:43,436 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 02:34:43,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:43,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118278813] [2021-11-23 02:34:43,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118278813] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:43,437 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:43,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:34:43,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612708563] [2021-11-23 02:34:43,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:43,440 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:43,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:43,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:43,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:34:43,441 INFO L87 Difference]: Start difference. First operand 3373 states and 5767 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:34:43,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:43,944 INFO L93 Difference]: Finished difference Result 6754 states and 10724 transitions. [2021-11-23 02:34:43,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:43,945 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2021-11-23 02:34:43,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:43,982 INFO L225 Difference]: With dead ends: 6754 [2021-11-23 02:34:43,982 INFO L226 Difference]: Without dead ends: 5027 [2021-11-23 02:34:43,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:34:43,992 INFO L933 BasicCegarLoop]: 3200 mSDtfsCounter, 3393 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3393 SdHoareTripleChecker+Valid, 3320 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:43,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3393 Valid, 3320 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:44,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5027 states. [2021-11-23 02:34:44,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5027 to 5001. [2021-11-23 02:34:44,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5001 states, 4355 states have (on average 1.6512055109070034) internal successors, (7191), 4373 states have internal predecessors, (7191), 436 states have call successors, (436), 208 states have call predecessors, (436), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2021-11-23 02:34:44,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5001 states to 5001 states and 8063 transitions. [2021-11-23 02:34:44,220 INFO L78 Accepts]: Start accepts. Automaton has 5001 states and 8063 transitions. Word has length 116 [2021-11-23 02:34:44,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:44,221 INFO L470 AbstractCegarLoop]: Abstraction has 5001 states and 8063 transitions. [2021-11-23 02:34:44,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:34:44,221 INFO L276 IsEmpty]: Start isEmpty. Operand 5001 states and 8063 transitions. [2021-11-23 02:34:44,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-23 02:34:44,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:44,234 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:34:44,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:34:44,234 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:44,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:44,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1773267854, now seen corresponding path program 1 times [2021-11-23 02:34:44,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:44,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694690485] [2021-11-23 02:34:44,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:44,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:44,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:44,296 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 02:34:44,296 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:44,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694690485] [2021-11-23 02:34:44,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694690485] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:44,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:34:44,297 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:34:44,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213273475] [2021-11-23 02:34:44,297 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:44,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:44,298 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:44,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:44,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:34:44,299 INFO L87 Difference]: Start difference. First operand 5001 states and 8063 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:34:44,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:44,896 INFO L93 Difference]: Finished difference Result 11566 states and 17572 transitions. [2021-11-23 02:34:44,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:44,897 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 116 [2021-11-23 02:34:44,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:44,956 INFO L225 Difference]: With dead ends: 11566 [2021-11-23 02:34:44,956 INFO L226 Difference]: Without dead ends: 8211 [2021-11-23 02:34:44,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:34:44,974 INFO L933 BasicCegarLoop]: 3214 mSDtfsCounter, 3396 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3396 SdHoareTripleChecker+Valid, 3334 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:44,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3396 Valid, 3334 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:34:44,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8211 states. [2021-11-23 02:34:45,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8211 to 8161. [2021-11-23 02:34:45,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8161 states, 6907 states have (on average 1.5623280729694513) internal successors, (10791), 6941 states have internal predecessors, (10791), 836 states have call successors, (836), 416 states have call predecessors, (836), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2021-11-23 02:34:45,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8161 states to 8161 states and 12463 transitions. [2021-11-23 02:34:45,422 INFO L78 Accepts]: Start accepts. Automaton has 8161 states and 12463 transitions. Word has length 116 [2021-11-23 02:34:45,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:45,423 INFO L470 AbstractCegarLoop]: Abstraction has 8161 states and 12463 transitions. [2021-11-23 02:34:45,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 02:34:45,424 INFO L276 IsEmpty]: Start isEmpty. Operand 8161 states and 12463 transitions. [2021-11-23 02:34:45,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 02:34:45,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:45,459 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 02:34:45,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:34:45,459 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:45,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:45,460 INFO L85 PathProgramCache]: Analyzing trace with hash -704827337, now seen corresponding path program 1 times [2021-11-23 02:34:45,460 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:45,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542944751] [2021-11-23 02:34:45,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:45,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:45,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:45,560 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 02:34:45,561 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:45,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1542944751] [2021-11-23 02:34:45,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1542944751] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:45,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647736266] [2021-11-23 02:34:45,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:45,562 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:45,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:45,566 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:45,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:34:45,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:45,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 735 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:34:45,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:45,980 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:34:45,980 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:34:45,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [647736266] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:34:45,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:34:45,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 02:34:45,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121190125] [2021-11-23 02:34:45,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:34:45,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:34:45,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:34:45,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:34:45,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:45,983 INFO L87 Difference]: Start difference. First operand 8161 states and 12463 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:34:46,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:34:46,811 INFO L93 Difference]: Finished difference Result 13957 states and 20833 transitions. [2021-11-23 02:34:46,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:34:46,812 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 134 [2021-11-23 02:34:46,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:34:46,880 INFO L225 Difference]: With dead ends: 13957 [2021-11-23 02:34:46,880 INFO L226 Difference]: Without dead ends: 10627 [2021-11-23 02:34:46,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:34:46,897 INFO L933 BasicCegarLoop]: 3276 mSDtfsCounter, 95 mSDsluCounter, 3426 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 6468 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:34:46,897 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 6468 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:34:46,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10627 states. [2021-11-23 02:34:47,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10627 to 9393. [2021-11-23 02:34:47,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9393 states, 8043 states have (on average 1.5744125326370757) internal successors, (12663), 8077 states have internal predecessors, (12663), 884 states have call successors, (884), 464 states have call predecessors, (884), 464 states have return successors, (884), 852 states have call predecessors, (884), 884 states have call successors, (884) [2021-11-23 02:34:47,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9393 states to 9393 states and 14431 transitions. [2021-11-23 02:34:47,466 INFO L78 Accepts]: Start accepts. Automaton has 9393 states and 14431 transitions. Word has length 134 [2021-11-23 02:34:47,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:34:47,468 INFO L470 AbstractCegarLoop]: Abstraction has 9393 states and 14431 transitions. [2021-11-23 02:34:47,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:34:47,468 INFO L276 IsEmpty]: Start isEmpty. Operand 9393 states and 14431 transitions. [2021-11-23 02:34:47,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-23 02:34:47,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:34:47,500 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 02:34:47,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:34:47,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:47,726 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:34:47,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:34:47,726 INFO L85 PathProgramCache]: Analyzing trace with hash -1317024008, now seen corresponding path program 2 times [2021-11-23 02:34:47,726 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:34:47,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354527566] [2021-11-23 02:34:47,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:34:47,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:34:47,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:34:47,844 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:34:47,844 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:34:47,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354527566] [2021-11-23 02:34:47,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354527566] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:34:47,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22976551] [2021-11-23 02:34:47,845 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:34:47,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:34:47,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:34:47,847 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:34:47,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_63180079-ff4b-4a72-8f5a-b4890a5ad234/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:34:48,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:34:48,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:34:48,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:34:48,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:34:48,476 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 62 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:34:48,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:34:49,122 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 19 proven. 40 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-23 02:34:49,122 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [22976551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:34:49,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1682539511] [2021-11-23 02:34:49,147 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2021-11-23 02:34:49,148 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:34:49,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:34:49,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:34:49,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:35:11,738 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 157 for LOIs [2021-11-23 02:35:11,798 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12 [2021-11-23 02:35:18,974 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 12