./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.06.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.06.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7 --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 4d0fbec14d1477738cb6d25ea9b61fc7005f787f2c8a0ac2c555d7e4fa1dbf47 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:20:58,791 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:20:58,793 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:20:58,851 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:20:58,851 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:20:58,858 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:20:58,862 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:20:58,867 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:20:58,870 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:20:58,878 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:20:58,880 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:20:58,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:20:58,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:20:58,885 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:20:58,888 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:20:58,891 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:20:58,893 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:20:58,894 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:20:58,900 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:20:58,903 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:20:58,905 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:20:58,908 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:20:58,911 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:20:58,913 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:20:58,919 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:20:58,920 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:20:58,920 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:20:58,923 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:20:58,923 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:20:58,925 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:20:58,926 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:20:58,927 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:20:58,929 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:20:58,930 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:20:58,932 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:20:58,932 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:20:58,933 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:20:58,934 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:20:58,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:20:58,935 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:20:58,936 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:20:58,937 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:20:58,990 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:20:58,990 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:20:58,991 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:20:58,991 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:20:58,992 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:20:58,993 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:20:58,993 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:20:58,993 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:20:58,993 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:20:58,994 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:20:58,995 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:20:58,995 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:20:58,996 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:20:58,996 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:20:58,996 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:20:58,996 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:20:58,997 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:20:58,997 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:20:58,998 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:20:58,998 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:20:58,998 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:20:58,999 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:20:58,999 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:20:58,999 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:20:58,999 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:20:59,000 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:20:59,002 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:20:59,002 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:20:59,002 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:20:59,002 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:20:59,003 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:20:59,003 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:20:59,003 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:20:59,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:20:59,004 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:20:59,004 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:20:59,005 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:20:59,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:20:59,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:20:59,005 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:20:59,006 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:20:59,006 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_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d0fbec14d1477738cb6d25ea9b61fc7005f787f2c8a0ac2c555d7e4fa1dbf47 [2021-11-25 18:20:59,319 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:20:59,343 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:20:59,346 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:20:59,347 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:20:59,348 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:20:59,350 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/systemc/token_ring.06.cil-2.c [2021-11-25 18:20:59,425 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/data/f30162c64/18ad45e5b6f2466ca0eb88fc7f17ff94/FLAG5adbe2b65 [2021-11-25 18:21:00,038 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:21:00,039 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/sv-benchmarks/c/systemc/token_ring.06.cil-2.c [2021-11-25 18:21:00,061 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/data/f30162c64/18ad45e5b6f2466ca0eb88fc7f17ff94/FLAG5adbe2b65 [2021-11-25 18:21:00,347 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/data/f30162c64/18ad45e5b6f2466ca0eb88fc7f17ff94 [2021-11-25 18:21:00,352 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:21:00,354 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:21:00,357 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:21:00,357 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:21:00,360 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:21:00,361 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,364 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4ef75887 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00, skipping insertion in model container [2021-11-25 18:21:00,364 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,372 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:21:00,428 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:21:00,623 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_3a5969c6-c762-4942-ae69-95279460e8ef/sv-benchmarks/c/systemc/token_ring.06.cil-2.c[671,684] [2021-11-25 18:21:00,723 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:21:00,742 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:21:00,761 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_3a5969c6-c762-4942-ae69-95279460e8ef/sv-benchmarks/c/systemc/token_ring.06.cil-2.c[671,684] [2021-11-25 18:21:00,841 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:21:00,873 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:21:00,874 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00 WrapperNode [2021-11-25 18:21:00,874 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:21:00,877 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:21:00,877 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:21:00,877 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:21:00,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,898 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,947 INFO L137 Inliner]: procedures = 40, calls = 49, calls flagged for inlining = 24, calls inlined = 24, statements flattened = 505 [2021-11-25 18:21:00,947 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:21:00,948 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:21:00,949 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:21:00,949 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:21:00,959 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,959 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,963 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,964 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,975 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:00,991 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:01,002 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:01,007 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:21:01,009 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:21:01,009 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:21:01,009 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:21:01,024 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (1/1) ... [2021-11-25 18:21:01,038 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:21:01,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:01,064 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:21:01,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:21:01,116 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:21:01,116 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-25 18:21:01,116 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-25 18:21:01,117 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-25 18:21:01,117 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-25 18:21:01,117 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-25 18:21:01,117 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-25 18:21:01,117 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-25 18:21:01,118 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-25 18:21:01,118 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-25 18:21:01,118 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-25 18:21:01,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:21:01,118 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-25 18:21:01,119 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-25 18:21:01,119 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:21:01,119 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:21:01,211 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:21:01,213 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:21:01,880 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:21:02,196 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:21:02,197 INFO L301 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-25 18:21:02,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:21:02 BoogieIcfgContainer [2021-11-25 18:21:02,200 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:21:02,202 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:21:02,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:21:02,206 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:21:02,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:21:00" (1/3) ... [2021-11-25 18:21:02,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c368896 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:21:02, skipping insertion in model container [2021-11-25 18:21:02,208 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:21:00" (2/3) ... [2021-11-25 18:21:02,209 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4c368896 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:21:02, skipping insertion in model container [2021-11-25 18:21:02,209 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:21:02" (3/3) ... [2021-11-25 18:21:02,211 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.06.cil-2.c [2021-11-25 18:21:02,217 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:21:02,217 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:21:02,266 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:21:02,272 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 [2021-11-25 18:21:02,272 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:21:02,294 INFO L276 IsEmpty]: Start isEmpty. Operand has 122 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 96 states have internal predecessors, (144), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 18:21:02,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 18:21:02,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:02,303 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:02,303 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:02,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:02,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1177898812, now seen corresponding path program 1 times [2021-11-25 18:21:02,319 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:02,320 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351805418] [2021-11-25 18:21:02,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:02,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:02,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:21:02,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:02,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351805418] [2021-11-25 18:21:02,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351805418] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:02,644 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:21:02,644 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 18:21:02,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496270235] [2021-11-25 18:21:02,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:02,651 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:21:02,652 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:02,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:21:02,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:21:02,683 INFO L87 Difference]: Start difference. First operand has 122 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 96 states have internal predecessors, (144), 20 states have call successors, (20), 6 states have call predecessors, (20), 6 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 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) [2021-11-25 18:21:03,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:03,070 INFO L93 Difference]: Finished difference Result 350 states and 538 transitions. [2021-11-25 18:21:03,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 18:21:03,073 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 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 48 [2021-11-25 18:21:03,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:03,092 INFO L225 Difference]: With dead ends: 350 [2021-11-25 18:21:03,092 INFO L226 Difference]: Without dead ends: 229 [2021-11-25 18:21:03,101 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 [2021-11-25 18:21:03,107 INFO L933 BasicCegarLoop]: 274 mSDtfsCounter, 314 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 208 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 208 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:03,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [314 Valid, 474 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 208 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:21:03,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2021-11-25 18:21:03,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 228. [2021-11-25 18:21:03,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 179 states have (on average 1.4748603351955307) internal successors, (264), 181 states have internal predecessors, (264), 36 states have call successors, (36), 12 states have call predecessors, (36), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-25 18:21:03,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 336 transitions. [2021-11-25 18:21:03,229 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 336 transitions. Word has length 48 [2021-11-25 18:21:03,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:03,230 INFO L470 AbstractCegarLoop]: Abstraction has 228 states and 336 transitions. [2021-11-25 18:21:03,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 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) [2021-11-25 18:21:03,230 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 336 transitions. [2021-11-25 18:21:03,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:21:03,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:03,245 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:03,245 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:21:03,246 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:03,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:03,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1890008703, now seen corresponding path program 1 times [2021-11-25 18:21:03,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:03,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71804185] [2021-11-25 18:21:03,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:03,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:03,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:03,483 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:21:03,483 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:03,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71804185] [2021-11-25 18:21:03,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71804185] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:03,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235784105] [2021-11-25 18:21:03,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:03,485 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:03,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:03,491 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:03,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:21:03,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:03,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:21:03,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:03,912 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:21:03,913 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:03,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235784105] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:03,920 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:03,920 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:21:03,921 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444420014] [2021-11-25 18:21:03,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:03,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:03,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:03,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:03,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:03,924 INFO L87 Difference]: Start difference. First operand 228 states and 336 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) [2021-11-25 18:21:04,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:04,086 INFO L93 Difference]: Finished difference Result 667 states and 999 transitions. [2021-11-25 18:21:04,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:04,087 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 93 [2021-11-25 18:21:04,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:04,096 INFO L225 Difference]: With dead ends: 667 [2021-11-25 18:21:04,096 INFO L226 Difference]: Without dead ends: 444 [2021-11-25 18:21:04,099 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:04,100 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 154 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:04,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 322 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:04,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-11-25 18:21:04,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 440. [2021-11-25 18:21:04,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 349 states have (on average 1.4699140401146131) internal successors, (513), 352 states have internal predecessors, (513), 66 states have call successors, (66), 24 states have call predecessors, (66), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2021-11-25 18:21:04,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 645 transitions. [2021-11-25 18:21:04,177 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 645 transitions. Word has length 93 [2021-11-25 18:21:04,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:04,177 INFO L470 AbstractCegarLoop]: Abstraction has 440 states and 645 transitions. [2021-11-25 18:21:04,177 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) [2021-11-25 18:21:04,178 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 645 transitions. [2021-11-25 18:21:04,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:21:04,181 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:04,181 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:04,217 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 18:21:04,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:04,407 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:04,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:04,408 INFO L85 PathProgramCache]: Analyzing trace with hash 571015583, now seen corresponding path program 1 times [2021-11-25 18:21:04,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:04,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028151165] [2021-11-25 18:21:04,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:04,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:04,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:04,544 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:21:04,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:04,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028151165] [2021-11-25 18:21:04,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028151165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:04,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309230563] [2021-11-25 18:21:04,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:04,547 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:04,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:04,551 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:04,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:21:04,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:04,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 578 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:21:04,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:04,874 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:21:04,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:04,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309230563] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:04,875 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:04,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:21:04,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131410063] [2021-11-25 18:21:04,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:04,876 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:04,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:04,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:04,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:04,877 INFO L87 Difference]: Start difference. First operand 440 states and 645 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 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) [2021-11-25 18:21:04,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:04,996 INFO L93 Difference]: Finished difference Result 1297 states and 1932 transitions. [2021-11-25 18:21:04,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:04,997 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 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 93 [2021-11-25 18:21:04,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:05,004 INFO L225 Difference]: With dead ends: 1297 [2021-11-25 18:21:05,005 INFO L226 Difference]: Without dead ends: 862 [2021-11-25 18:21:05,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:05,008 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 151 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:05,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 296 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:05,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 862 states. [2021-11-25 18:21:05,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 862 to 856. [2021-11-25 18:21:05,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 856 states, 683 states have (on average 1.4626647144948755) internal successors, (999), 688 states have internal predecessors, (999), 124 states have call successors, (124), 48 states have call predecessors, (124), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2021-11-25 18:21:05,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 856 states to 856 states and 1247 transitions. [2021-11-25 18:21:05,090 INFO L78 Accepts]: Start accepts. Automaton has 856 states and 1247 transitions. Word has length 93 [2021-11-25 18:21:05,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:05,092 INFO L470 AbstractCegarLoop]: Abstraction has 856 states and 1247 transitions. [2021-11-25 18:21:05,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 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) [2021-11-25 18:21:05,092 INFO L276 IsEmpty]: Start isEmpty. Operand 856 states and 1247 transitions. [2021-11-25 18:21:05,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:21:05,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:05,099 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:05,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:05,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:05,316 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:05,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:05,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1005383041, now seen corresponding path program 1 times [2021-11-25 18:21:05,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:05,317 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251741081] [2021-11-25 18:21:05,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:05,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:05,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:05,415 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 18:21:05,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:05,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251741081] [2021-11-25 18:21:05,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251741081] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:05,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1316691541] [2021-11-25 18:21:05,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:05,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:05,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:05,420 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:05,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:21:05,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:05,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 572 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:21:05,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:05,746 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 18:21:05,746 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:05,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1316691541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:05,746 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:05,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-25 18:21:05,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153737157] [2021-11-25 18:21:05,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:05,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:05,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:05,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:05,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:05,751 INFO L87 Difference]: Start difference. First operand 856 states and 1247 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 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) [2021-11-25 18:21:05,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:05,908 INFO L93 Difference]: Finished difference Result 2533 states and 3748 transitions. [2021-11-25 18:21:05,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:05,909 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 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 93 [2021-11-25 18:21:05,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:05,932 INFO L225 Difference]: With dead ends: 2533 [2021-11-25 18:21:05,932 INFO L226 Difference]: Without dead ends: 1682 [2021-11-25 18:21:05,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:05,940 INFO L933 BasicCegarLoop]: 160 mSDtfsCounter, 145 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:05,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 296 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:05,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1682 states. [2021-11-25 18:21:06,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1682 to 1672. [2021-11-25 18:21:06,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1672 states, 1339 states have (on average 1.4540702016430171) internal successors, (1947), 1348 states have internal predecessors, (1947), 236 states have call successors, (236), 96 states have call predecessors, (236), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2021-11-25 18:21:06,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1672 states to 1672 states and 2419 transitions. [2021-11-25 18:21:06,089 INFO L78 Accepts]: Start accepts. Automaton has 1672 states and 2419 transitions. Word has length 93 [2021-11-25 18:21:06,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:06,090 INFO L470 AbstractCegarLoop]: Abstraction has 1672 states and 2419 transitions. [2021-11-25 18:21:06,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 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) [2021-11-25 18:21:06,091 INFO L276 IsEmpty]: Start isEmpty. Operand 1672 states and 2419 transitions. [2021-11-25 18:21:06,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-25 18:21:06,104 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:06,104 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:06,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:06,331 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:06,332 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:06,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:06,332 INFO L85 PathProgramCache]: Analyzing trace with hash -139244705, now seen corresponding path program 1 times [2021-11-25 18:21:06,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:06,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864773280] [2021-11-25 18:21:06,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:06,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:06,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:06,402 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 18:21:06,402 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:06,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864773280] [2021-11-25 18:21:06,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864773280] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:06,403 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:21:06,403 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:21:06,403 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963599785] [2021-11-25 18:21:06,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:06,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:06,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:06,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:06,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:21:06,406 INFO L87 Difference]: Start difference. First operand 1672 states and 2419 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 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) [2021-11-25 18:21:06,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:06,569 INFO L93 Difference]: Finished difference Result 2962 states and 4356 transitions. [2021-11-25 18:21:06,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:06,569 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 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 93 [2021-11-25 18:21:06,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:06,588 INFO L225 Difference]: With dead ends: 2962 [2021-11-25 18:21:06,588 INFO L226 Difference]: Without dead ends: 2112 [2021-11-25 18:21:06,594 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 [2021-11-25 18:21:06,595 INFO L933 BasicCegarLoop]: 223 mSDtfsCounter, 74 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:06,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 375 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:06,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2112 states. [2021-11-25 18:21:06,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2112 to 1956. [2021-11-25 18:21:06,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1956 states, 1607 states have (on average 1.4953329184816428) internal successors, (2403), 1616 states have internal predecessors, (2403), 244 states have call successors, (244), 104 states have call predecessors, (244), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-25 18:21:06,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1956 states to 1956 states and 2891 transitions. [2021-11-25 18:21:06,728 INFO L78 Accepts]: Start accepts. Automaton has 1956 states and 2891 transitions. Word has length 93 [2021-11-25 18:21:06,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:06,729 INFO L470 AbstractCegarLoop]: Abstraction has 1956 states and 2891 transitions. [2021-11-25 18:21:06,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 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) [2021-11-25 18:21:06,730 INFO L276 IsEmpty]: Start isEmpty. Operand 1956 states and 2891 transitions. [2021-11-25 18:21:06,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 18:21:06,738 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:06,738 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, 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] [2021-11-25 18:21:06,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 18:21:06,739 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:06,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:06,740 INFO L85 PathProgramCache]: Analyzing trace with hash -80839007, now seen corresponding path program 1 times [2021-11-25 18:21:06,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:06,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465584222] [2021-11-25 18:21:06,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:06,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:06,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:06,843 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 18:21:06,847 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:06,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465584222] [2021-11-25 18:21:06,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465584222] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:06,848 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:21:06,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:21:06,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262878646] [2021-11-25 18:21:06,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:06,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:06,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:06,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:06,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:21:06,850 INFO L87 Difference]: Start difference. First operand 1956 states and 2891 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-25 18:21:07,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:07,081 INFO L93 Difference]: Finished difference Result 5785 states and 8648 transitions. [2021-11-25 18:21:07,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:07,082 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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 125 [2021-11-25 18:21:07,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:07,111 INFO L225 Difference]: With dead ends: 5785 [2021-11-25 18:21:07,112 INFO L226 Difference]: Without dead ends: 3834 [2021-11-25 18:21:07,154 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 [2021-11-25 18:21:07,155 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 143 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:07,156 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 298 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:07,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3834 states. [2021-11-25 18:21:07,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3834 to 3808. [2021-11-25 18:21:07,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3808 states, 3131 states have (on average 1.4829128074097733) internal successors, (4643), 3148 states have internal predecessors, (4643), 468 states have call successors, (468), 208 states have call predecessors, (468), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-25 18:21:07,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3808 states to 3808 states and 5579 transitions. [2021-11-25 18:21:07,373 INFO L78 Accepts]: Start accepts. Automaton has 3808 states and 5579 transitions. Word has length 125 [2021-11-25 18:21:07,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:07,376 INFO L470 AbstractCegarLoop]: Abstraction has 3808 states and 5579 transitions. [2021-11-25 18:21:07,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-25 18:21:07,376 INFO L276 IsEmpty]: Start isEmpty. Operand 3808 states and 5579 transitions. [2021-11-25 18:21:07,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 18:21:07,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:07,390 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, 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] [2021-11-25 18:21:07,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 18:21:07,390 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:07,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:07,391 INFO L85 PathProgramCache]: Analyzing trace with hash -5703449, now seen corresponding path program 1 times [2021-11-25 18:21:07,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:07,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359296290] [2021-11-25 18:21:07,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:07,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:07,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:07,512 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 18:21:07,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:07,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359296290] [2021-11-25 18:21:07,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359296290] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:07,513 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:21:07,513 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:21:07,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830760179] [2021-11-25 18:21:07,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:07,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:07,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:07,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:07,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:21:07,515 INFO L87 Difference]: Start difference. First operand 3808 states and 5579 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-25 18:21:07,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:07,900 INFO L93 Difference]: Finished difference Result 11269 states and 16688 transitions. [2021-11-25 18:21:07,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:07,901 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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 125 [2021-11-25 18:21:07,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:07,963 INFO L225 Difference]: With dead ends: 11269 [2021-11-25 18:21:07,963 INFO L226 Difference]: Without dead ends: 7466 [2021-11-25 18:21:07,979 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 [2021-11-25 18:21:07,982 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 145 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:07,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 298 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:07,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7466 states. [2021-11-25 18:21:08,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7466 to 7416. [2021-11-25 18:21:08,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7416 states, 6099 states have (on average 1.469585177898016) internal successors, (8963), 6132 states have internal predecessors, (8963), 900 states have call successors, (900), 416 states have call predecessors, (900), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2021-11-25 18:21:08,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7416 states to 7416 states and 10763 transitions. [2021-11-25 18:21:08,483 INFO L78 Accepts]: Start accepts. Automaton has 7416 states and 10763 transitions. Word has length 125 [2021-11-25 18:21:08,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:08,484 INFO L470 AbstractCegarLoop]: Abstraction has 7416 states and 10763 transitions. [2021-11-25 18:21:08,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-25 18:21:08,484 INFO L276 IsEmpty]: Start isEmpty. Operand 7416 states and 10763 transitions. [2021-11-25 18:21:08,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 18:21:08,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:08,511 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, 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] [2021-11-25 18:21:08,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 18:21:08,512 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:08,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:08,512 INFO L85 PathProgramCache]: Analyzing trace with hash -450392317, now seen corresponding path program 1 times [2021-11-25 18:21:08,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:08,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019352982] [2021-11-25 18:21:08,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:08,513 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:08,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:08,575 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-25 18:21:08,575 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:08,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019352982] [2021-11-25 18:21:08,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019352982] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:08,576 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:21:08,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:21:08,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936145411] [2021-11-25 18:21:08,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:08,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:08,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:08,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:08,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:21:08,578 INFO L87 Difference]: Start difference. First operand 7416 states and 10763 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-25 18:21:09,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:09,311 INFO L93 Difference]: Finished difference Result 21949 states and 32176 transitions. [2021-11-25 18:21:09,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:09,312 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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 125 [2021-11-25 18:21:09,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:09,445 INFO L225 Difference]: With dead ends: 21949 [2021-11-25 18:21:09,445 INFO L226 Difference]: Without dead ends: 14538 [2021-11-25 18:21:09,485 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 [2021-11-25 18:21:09,486 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 148 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:09,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 305 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:09,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14538 states. [2021-11-25 18:21:10,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14538 to 14440. [2021-11-25 18:21:10,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14440 states, 11875 states have (on average 1.4554105263157895) internal successors, (17283), 11940 states have internal predecessors, (17283), 1732 states have call successors, (1732), 832 states have call predecessors, (1732), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2021-11-25 18:21:10,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14440 states to 14440 states and 20747 transitions. [2021-11-25 18:21:10,328 INFO L78 Accepts]: Start accepts. Automaton has 14440 states and 20747 transitions. Word has length 125 [2021-11-25 18:21:10,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:10,329 INFO L470 AbstractCegarLoop]: Abstraction has 14440 states and 20747 transitions. [2021-11-25 18:21:10,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 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) [2021-11-25 18:21:10,329 INFO L276 IsEmpty]: Start isEmpty. Operand 14440 states and 20747 transitions. [2021-11-25 18:21:10,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:21:10,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:10,399 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 18:21:10,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 18:21:10,399 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:10,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:10,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1326025340, now seen corresponding path program 1 times [2021-11-25 18:21:10,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:10,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321133280] [2021-11-25 18:21:10,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:10,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:10,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:10,475 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-25 18:21:10,476 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:10,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321133280] [2021-11-25 18:21:10,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321133280] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:10,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:21:10,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 18:21:10,477 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518329511] [2021-11-25 18:21:10,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:10,477 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:10,477 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:10,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:10,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:21:10,479 INFO L87 Difference]: Start difference. First operand 14440 states and 20747 transitions. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 3 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:11,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:11,686 INFO L93 Difference]: Finished difference Result 37932 states and 55501 transitions. [2021-11-25 18:21:11,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:11,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 3 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 144 [2021-11-25 18:21:11,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:11,819 INFO L225 Difference]: With dead ends: 37932 [2021-11-25 18:21:11,819 INFO L226 Difference]: Without dead ends: 23498 [2021-11-25 18:21:11,878 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 [2021-11-25 18:21:11,881 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 84 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:11,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 336 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:11,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23498 states. [2021-11-25 18:21:13,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23498 to 20240. [2021-11-25 18:21:13,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20240 states, 17287 states have (on average 1.522010759530283) internal successors, (26311), 17353 states have internal predecessors, (26311), 1926 states have call successors, (1926), 1026 states have call predecessors, (1926), 1026 states have return successors, (1926), 1861 states have call predecessors, (1926), 1926 states have call successors, (1926) [2021-11-25 18:21:13,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20240 states to 20240 states and 30163 transitions. [2021-11-25 18:21:13,159 INFO L78 Accepts]: Start accepts. Automaton has 20240 states and 30163 transitions. Word has length 144 [2021-11-25 18:21:13,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:13,160 INFO L470 AbstractCegarLoop]: Abstraction has 20240 states and 30163 transitions. [2021-11-25 18:21:13,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 3 states have call successors, (10), 1 states have call predecessors, (10), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:13,161 INFO L276 IsEmpty]: Start isEmpty. Operand 20240 states and 30163 transitions. [2021-11-25 18:21:13,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:21:13,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:13,247 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 18:21:13,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-25 18:21:13,247 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:13,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:13,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1153047128, now seen corresponding path program 2 times [2021-11-25 18:21:13,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:13,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534889398] [2021-11-25 18:21:13,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:13,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:13,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:13,352 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-25 18:21:13,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:13,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534889398] [2021-11-25 18:21:13,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534889398] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:13,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564487660] [2021-11-25 18:21:13,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:21:13,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:13,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:13,355 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:13,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:21:13,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:21:13,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:21:13,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:21:13,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:13,757 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-25 18:21:13,757 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:13,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564487660] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:13,758 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:13,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 18:21:13,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856989336] [2021-11-25 18:21:13,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:13,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:13,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:13,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:13,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:13,760 INFO L87 Difference]: Start difference. First operand 20240 states and 30163 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:14,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:14,746 INFO L93 Difference]: Finished difference Result 30708 states and 46357 transitions. [2021-11-25 18:21:14,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:14,747 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 144 [2021-11-25 18:21:14,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:14,831 INFO L225 Difference]: With dead ends: 30708 [2021-11-25 18:21:14,831 INFO L226 Difference]: Without dead ends: 20306 [2021-11-25 18:21:14,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:14,857 INFO L933 BasicCegarLoop]: 273 mSDtfsCounter, 142 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:14,858 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 412 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:21:14,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20306 states. [2021-11-25 18:21:15,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20306 to 19984. [2021-11-25 18:21:15,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19984 states, 17031 states have (on average 1.503552345722506) internal successors, (25607), 17097 states have internal predecessors, (25607), 1926 states have call successors, (1926), 1026 states have call predecessors, (1926), 1026 states have return successors, (1926), 1861 states have call predecessors, (1926), 1926 states have call successors, (1926) [2021-11-25 18:21:15,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19984 states to 19984 states and 29459 transitions. [2021-11-25 18:21:15,974 INFO L78 Accepts]: Start accepts. Automaton has 19984 states and 29459 transitions. Word has length 144 [2021-11-25 18:21:15,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:15,974 INFO L470 AbstractCegarLoop]: Abstraction has 19984 states and 29459 transitions. [2021-11-25 18:21:15,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:15,975 INFO L276 IsEmpty]: Start isEmpty. Operand 19984 states and 29459 transitions. [2021-11-25 18:21:16,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:21:16,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:16,065 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:16,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:16,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:16,291 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:16,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:16,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1814380919, now seen corresponding path program 1 times [2021-11-25 18:21:16,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:16,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335849003] [2021-11-25 18:21:16,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:16,292 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:16,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:16,403 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-25 18:21:16,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:16,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335849003] [2021-11-25 18:21:16,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335849003] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:16,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1324460234] [2021-11-25 18:21:16,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:16,405 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:16,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:16,406 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:16,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:21:16,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:16,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 774 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:21:16,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:16,822 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 18:21:16,823 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:16,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1324460234] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:16,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:16,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-25 18:21:16,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127323387] [2021-11-25 18:21:16,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:16,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:16,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:16,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:16,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:16,828 INFO L87 Difference]: Start difference. First operand 19984 states and 29459 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:21:17,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:17,979 INFO L93 Difference]: Finished difference Result 38260 states and 56949 transitions. [2021-11-25 18:21:17,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:17,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 144 [2021-11-25 18:21:17,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:18,087 INFO L225 Difference]: With dead ends: 38260 [2021-11-25 18:21:18,087 INFO L226 Difference]: Without dead ends: 28242 [2021-11-25 18:21:18,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-25 18:21:18,108 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 110 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:18,109 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 404 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:18,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28242 states. [2021-11-25 18:21:19,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28242 to 25488. [2021-11-25 18:21:19,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25488 states, 22151 states have (on average 1.5374023746106271) internal successors, (34055), 22217 states have internal predecessors, (34055), 2118 states have call successors, (2118), 1218 states have call predecessors, (2118), 1218 states have return successors, (2118), 2053 states have call predecessors, (2118), 2118 states have call successors, (2118) [2021-11-25 18:21:19,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25488 states to 25488 states and 38291 transitions. [2021-11-25 18:21:19,306 INFO L78 Accepts]: Start accepts. Automaton has 25488 states and 38291 transitions. Word has length 144 [2021-11-25 18:21:19,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:19,307 INFO L470 AbstractCegarLoop]: Abstraction has 25488 states and 38291 transitions. [2021-11-25 18:21:19,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-25 18:21:19,307 INFO L276 IsEmpty]: Start isEmpty. Operand 25488 states and 38291 transitions. [2021-11-25 18:21:19,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:21:19,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:19,370 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:19,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 18:21:19,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:19,583 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:19,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:19,584 INFO L85 PathProgramCache]: Analyzing trace with hash 2052960420, now seen corresponding path program 2 times [2021-11-25 18:21:19,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:19,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797007727] [2021-11-25 18:21:19,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:19,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:19,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:19,671 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 18:21:19,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:19,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797007727] [2021-11-25 18:21:19,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797007727] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:19,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679526858] [2021-11-25 18:21:19,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:21:19,673 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:19,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:19,674 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:19,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:21:19,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:21:19,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:21:19,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:21:19,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:20,035 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 18:21:20,036 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:20,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679526858] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:20,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:20,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:21:20,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255344942] [2021-11-25 18:21:20,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:20,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:20,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:20,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:20,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:20,039 INFO L87 Difference]: Start difference. First operand 25488 states and 38291 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:21,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:21,026 INFO L93 Difference]: Finished difference Result 38532 states and 58453 transitions. [2021-11-25 18:21:21,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:21,026 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 144 [2021-11-25 18:21:21,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:21,121 INFO L225 Difference]: With dead ends: 38532 [2021-11-25 18:21:21,122 INFO L226 Difference]: Without dead ends: 25554 [2021-11-25 18:21:21,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:21,153 INFO L933 BasicCegarLoop]: 267 mSDtfsCounter, 149 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:21,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 405 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:21,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25554 states. [2021-11-25 18:21:22,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25554 to 25328. [2021-11-25 18:21:22,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25328 states, 21991 states have (on average 1.5253058069210133) internal successors, (33543), 22057 states have internal predecessors, (33543), 2118 states have call successors, (2118), 1218 states have call predecessors, (2118), 1218 states have return successors, (2118), 2053 states have call predecessors, (2118), 2118 states have call successors, (2118) [2021-11-25 18:21:22,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25328 states to 25328 states and 37779 transitions. [2021-11-25 18:21:22,250 INFO L78 Accepts]: Start accepts. Automaton has 25328 states and 37779 transitions. Word has length 144 [2021-11-25 18:21:22,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:22,251 INFO L470 AbstractCegarLoop]: Abstraction has 25328 states and 37779 transitions. [2021-11-25 18:21:22,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:22,251 INFO L276 IsEmpty]: Start isEmpty. Operand 25328 states and 37779 transitions. [2021-11-25 18:21:22,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:21:22,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:22,305 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:22,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:22,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:22,519 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:22,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:22,520 INFO L85 PathProgramCache]: Analyzing trace with hash 1001511331, now seen corresponding path program 1 times [2021-11-25 18:21:22,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:22,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923215961] [2021-11-25 18:21:22,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:22,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:22,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:22,626 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 18:21:22,626 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:22,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923215961] [2021-11-25 18:21:22,627 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [923215961] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:22,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216874534] [2021-11-25 18:21:22,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:22,627 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:22,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:22,632 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:22,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:21:22,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:22,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 780 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:21:22,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 18:21:23,076 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:23,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1216874534] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:23,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:23,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:21:23,078 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041664096] [2021-11-25 18:21:23,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:23,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:23,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:23,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:23,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:23,079 INFO L87 Difference]: Start difference. First operand 25328 states and 37779 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:24,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:24,093 INFO L93 Difference]: Finished difference Result 41836 states and 61630 transitions. [2021-11-25 18:21:24,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:24,093 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 144 [2021-11-25 18:21:24,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:24,203 INFO L225 Difference]: With dead ends: 41836 [2021-11-25 18:21:24,203 INFO L226 Difference]: Without dead ends: 29098 [2021-11-25 18:21:24,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:24,242 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 147 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:24,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [147 Valid, 205 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:21:24,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29098 states. [2021-11-25 18:21:25,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29098 to 29098. [2021-11-25 18:21:25,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29098 states, 25381 states have (on average 1.4828808951577952) internal successors, (37637), 25447 states have internal predecessors, (37637), 2244 states have call successors, (2244), 1472 states have call predecessors, (2244), 1472 states have return successors, (2244), 2179 states have call predecessors, (2244), 2244 states have call successors, (2244) [2021-11-25 18:21:25,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29098 states to 29098 states and 42125 transitions. [2021-11-25 18:21:25,531 INFO L78 Accepts]: Start accepts. Automaton has 29098 states and 42125 transitions. Word has length 144 [2021-11-25 18:21:25,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:25,531 INFO L470 AbstractCegarLoop]: Abstraction has 29098 states and 42125 transitions. [2021-11-25 18:21:25,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:25,532 INFO L276 IsEmpty]: Start isEmpty. Operand 29098 states and 42125 transitions. [2021-11-25 18:21:25,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-25 18:21:25,598 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:25,598 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:25,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:25,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:25,819 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:25,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:25,820 INFO L85 PathProgramCache]: Analyzing trace with hash -534363205, now seen corresponding path program 1 times [2021-11-25 18:21:25,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:25,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649783999] [2021-11-25 18:21:25,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:25,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:25,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:25,922 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 18:21:25,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:25,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649783999] [2021-11-25 18:21:25,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649783999] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:25,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [162763451] [2021-11-25 18:21:25,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:25,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:25,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:25,925 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:25,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:21:26,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:26,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 783 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:21:26,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:26,377 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 18:21:26,377 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:26,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [162763451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:26,378 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:26,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:21:26,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398982806] [2021-11-25 18:21:26,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:26,379 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:26,379 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:26,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:26,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:26,380 INFO L87 Difference]: Start difference. First operand 29098 states and 42125 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:27,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:27,935 INFO L93 Difference]: Finished difference Result 71764 states and 105428 transitions. [2021-11-25 18:21:27,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:27,936 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 144 [2021-11-25 18:21:27,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:28,084 INFO L225 Difference]: With dead ends: 71764 [2021-11-25 18:21:28,085 INFO L226 Difference]: Without dead ends: 42672 [2021-11-25 18:21:28,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:28,136 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 73 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:28,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 311 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:28,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42672 states. [2021-11-25 18:21:29,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42672 to 34634. [2021-11-25 18:21:29,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34634 states, 30533 states have (on average 1.5072544460092359) internal successors, (46021), 30599 states have internal predecessors, (46021), 2436 states have call successors, (2436), 1664 states have call predecessors, (2436), 1664 states have return successors, (2436), 2371 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-25 18:21:29,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34634 states to 34634 states and 50893 transitions. [2021-11-25 18:21:29,649 INFO L78 Accepts]: Start accepts. Automaton has 34634 states and 50893 transitions. Word has length 144 [2021-11-25 18:21:29,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:29,649 INFO L470 AbstractCegarLoop]: Abstraction has 34634 states and 50893 transitions. [2021-11-25 18:21:29,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:29,649 INFO L276 IsEmpty]: Start isEmpty. Operand 34634 states and 50893 transitions. [2021-11-25 18:21:29,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 18:21:29,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:29,719 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:29,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:29,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 18:21:29,947 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:29,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:29,948 INFO L85 PathProgramCache]: Analyzing trace with hash 2108406321, now seen corresponding path program 1 times [2021-11-25 18:21:29,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:29,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484264058] [2021-11-25 18:21:29,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:29,948 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:29,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:30,033 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 41 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 18:21:30,033 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:30,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484264058] [2021-11-25 18:21:30,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484264058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:30,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784770965] [2021-11-25 18:21:30,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:30,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:30,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:30,035 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:30,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 18:21:30,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:30,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:21:30,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:30,498 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:21:30,498 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:30,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784770965] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:30,499 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:30,499 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-25 18:21:30,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200128765] [2021-11-25 18:21:30,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:30,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 18:21:30,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:30,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 18:21:30,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-25 18:21:30,502 INFO L87 Difference]: Start difference. First operand 34634 states and 50893 transitions. Second operand has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 18:21:32,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:32,824 INFO L93 Difference]: Finished difference Result 103376 states and 151277 transitions. [2021-11-25 18:21:32,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 18:21:32,825 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 145 [2021-11-25 18:21:32,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:33,283 INFO L225 Difference]: With dead ends: 103376 [2021-11-25 18:21:33,283 INFO L226 Difference]: Without dead ends: 68748 [2021-11-25 18:21:33,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-25 18:21:33,357 INFO L933 BasicCegarLoop]: 296 mSDtfsCounter, 170 mSDsluCounter, 486 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 709 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:33,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 709 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:33,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68748 states. [2021-11-25 18:21:36,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68748 to 68482. [2021-11-25 18:21:36,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68482 states, 60227 states have (on average 1.4771281983163698) internal successors, (88963), 60486 states have internal predecessors, (88963), 4801 states have call successors, (4801), 3325 states have call predecessors, (4801), 3453 states have return successors, (5597), 4671 states have call predecessors, (5597), 4801 states have call successors, (5597) [2021-11-25 18:21:36,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68482 states to 68482 states and 99361 transitions. [2021-11-25 18:21:36,373 INFO L78 Accepts]: Start accepts. Automaton has 68482 states and 99361 transitions. Word has length 145 [2021-11-25 18:21:36,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:36,374 INFO L470 AbstractCegarLoop]: Abstraction has 68482 states and 99361 transitions. [2021-11-25 18:21:36,374 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 27.75) internal successors, (111), 4 states have internal predecessors, (111), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-25 18:21:36,374 INFO L276 IsEmpty]: Start isEmpty. Operand 68482 states and 99361 transitions. [2021-11-25 18:21:36,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 18:21:36,486 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:36,486 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:36,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-25 18:21:36,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 18:21:36,699 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:36,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:36,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1279804528, now seen corresponding path program 2 times [2021-11-25 18:21:36,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:36,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183739650] [2021-11-25 18:21:36,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:36,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:36,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:36,778 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:21:36,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:36,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183739650] [2021-11-25 18:21:36,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183739650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:36,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2058896092] [2021-11-25 18:21:36,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:21:36,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:36,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:36,780 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:36,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 18:21:36,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:21:36,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:21:36,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:21:36,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:37,149 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 84 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 18:21:37,149 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:37,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2058896092] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:37,149 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:37,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:21:37,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594565932] [2021-11-25 18:21:37,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:37,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:37,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:37,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:37,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:37,151 INFO L87 Difference]: Start difference. First operand 68482 states and 99361 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:40,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:40,069 INFO L93 Difference]: Finished difference Result 137080 states and 202181 transitions. [2021-11-25 18:21:40,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:40,069 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-25 18:21:40,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:40,428 INFO L225 Difference]: With dead ends: 137080 [2021-11-25 18:21:40,428 INFO L226 Difference]: Without dead ends: 101436 [2021-11-25 18:21:40,504 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:40,505 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 138 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:40,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 308 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:21:40,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101436 states. [2021-11-25 18:21:44,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101436 to 100534. [2021-11-25 18:21:44,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100534 states, 88255 states have (on average 1.4764375956036486) internal successors, (130303), 88578 states have internal predecessors, (130303), 7165 states have call successors, (7165), 4985 states have call predecessors, (7165), 5113 states have return successors, (8981), 6971 states have call predecessors, (8981), 7165 states have call successors, (8981) [2021-11-25 18:21:44,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100534 states to 100534 states and 146449 transitions. [2021-11-25 18:21:44,476 INFO L78 Accepts]: Start accepts. Automaton has 100534 states and 146449 transitions. Word has length 145 [2021-11-25 18:21:44,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:44,477 INFO L470 AbstractCegarLoop]: Abstraction has 100534 states and 146449 transitions. [2021-11-25 18:21:44,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:44,477 INFO L276 IsEmpty]: Start isEmpty. Operand 100534 states and 146449 transitions. [2021-11-25 18:21:44,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 18:21:44,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:44,648 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:21:44,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:44,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 18:21:44,849 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:44,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:44,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1328119540, now seen corresponding path program 3 times [2021-11-25 18:21:44,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:44,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731818322] [2021-11-25 18:21:44,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:44,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:44,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:44,945 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 13 proven. 42 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:21:44,946 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:44,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731818322] [2021-11-25 18:21:44,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731818322] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:44,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833536650] [2021-11-25 18:21:44,947 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:21:44,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:44,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:44,948 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:44,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 18:21:45,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:21:45,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:21:45,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:21:45,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:21:45,355 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 76 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-25 18:21:45,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:21:45,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833536650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:21:45,356 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:21:45,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 18:21:45,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786132064] [2021-11-25 18:21:45,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:21:45,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:21:45,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:21:45,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:21:45,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:45,358 INFO L87 Difference]: Start difference. First operand 100534 states and 146449 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:49,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:21:49,042 INFO L93 Difference]: Finished difference Result 176560 states and 255932 transitions. [2021-11-25 18:21:49,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:21:49,052 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 145 [2021-11-25 18:21:49,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:21:49,433 INFO L225 Difference]: With dead ends: 176560 [2021-11-25 18:21:49,433 INFO L226 Difference]: Without dead ends: 108096 [2021-11-25 18:21:49,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-25 18:21:49,572 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 103 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:21:49,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 217 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:21:49,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108096 states. [2021-11-25 18:21:53,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108096 to 107936. [2021-11-25 18:21:53,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107936 states, 95129 states have (on average 1.453111038694825) internal successors, (138233), 95260 states have internal predecessors, (138233), 7347 states have call successors, (7347), 5551 states have call predecessors, (7347), 5459 states have return successors, (8685), 7125 states have call predecessors, (8685), 7347 states have call successors, (8685) [2021-11-25 18:21:53,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107936 states to 107936 states and 154265 transitions. [2021-11-25 18:21:53,813 INFO L78 Accepts]: Start accepts. Automaton has 107936 states and 154265 transitions. Word has length 145 [2021-11-25 18:21:53,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:21:53,813 INFO L470 AbstractCegarLoop]: Abstraction has 107936 states and 154265 transitions. [2021-11-25 18:21:53,814 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 3 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-25 18:21:53,814 INFO L276 IsEmpty]: Start isEmpty. Operand 107936 states and 154265 transitions. [2021-11-25 18:21:53,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 18:21:53,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:21:53,985 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 18:21:54,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 18:21:54,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 18:21:54,186 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:21:54,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:21:54,186 INFO L85 PathProgramCache]: Analyzing trace with hash -409144917, now seen corresponding path program 1 times [2021-11-25 18:21:54,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:21:54,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201689498] [2021-11-25 18:21:54,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:54,187 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:21:54,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:21:54,266 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 18:21:54,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:21:54,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201689498] [2021-11-25 18:21:54,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201689498] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:21:54,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007237992] [2021-11-25 18:21:54,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:21:54,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:21:54,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:21:54,268 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:21:54,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3a5969c6-c762-4942-ae69-95279460e8ef/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process