./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.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_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/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_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/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_81b8b65d-8e77-45f5-bbc8-8516a5793061/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 c9ff936057be59b0f479a8c37fd17409fe797633e9a8a05703f5728379735d91 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:50:50,886 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:50:50,888 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:50:50,933 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:50:50,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:50:50,939 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:50:50,942 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:50:50,946 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:50:50,949 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:50:50,956 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:50:50,958 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:50:50,959 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:50:50,960 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:50:50,963 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:50:50,965 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:50:50,970 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:50:50,975 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:50:50,976 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:50:50,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:50:50,985 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:50:50,987 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:50:50,989 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:50:50,992 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:50:50,993 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:50:50,998 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:50:50,998 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:50:50,998 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:50:51,000 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:50:51,001 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:50:51,002 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:50:51,002 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:50:51,002 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:50:51,003 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:50:51,004 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:50:51,005 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:50:51,005 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:50:51,006 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:50:51,006 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:50:51,007 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:50:51,008 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:50:51,008 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:50:51,009 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:50:51,044 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:50:51,044 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:50:51,044 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:50:51,044 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:50:51,045 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:50:51,045 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:50:51,046 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:50:51,046 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:50:51,046 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:50:51,046 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:50:51,046 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:50:51,047 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:50:51,047 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:50:51,047 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:50:51,047 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:50:51,047 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:50:51,048 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:50:51,048 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:50:51,049 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:50:51,049 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:50:51,049 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:50:51,049 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:50:51,049 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:50:51,050 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:50:51,050 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:50:51,050 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:50:51,050 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:50:51,050 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:50:51,051 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:50:51,051 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:50:51,051 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:50:51,051 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:50:51,051 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:50:51,052 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:50:51,052 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:50:51,052 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:50:51,052 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:50:51,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:50:51,053 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:50:51,053 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:50:51,053 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:50:51,053 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_81b8b65d-8e77-45f5-bbc8-8516a5793061/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c9ff936057be59b0f479a8c37fd17409fe797633e9a8a05703f5728379735d91 [2021-11-25 19:50:51,392 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:50:51,424 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:50:51,427 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:50:51,429 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:50:51,430 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:50:51,431 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c [2021-11-25 19:50:51,511 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/8fee78ddf/625e19bf9aaf49fba81629bbb3d2d007/FLAG887b4cf9b [2021-11-25 19:50:51,975 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:50:51,975 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c [2021-11-25 19:50:51,983 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/8fee78ddf/625e19bf9aaf49fba81629bbb3d2d007/FLAG887b4cf9b [2021-11-25 19:50:52,307 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/8fee78ddf/625e19bf9aaf49fba81629bbb3d2d007 [2021-11-25 19:50:52,309 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:50:52,310 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:50:52,321 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:50:52,321 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:50:52,324 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:50:52,326 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,327 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17d3b36c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52, skipping insertion in model container [2021-11-25 19:50:52,328 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,333 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:50:52,360 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:50:52,516 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_81b8b65d-8e77-45f5-bbc8-8516a5793061/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c[755,768] [2021-11-25 19:50:52,608 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:50:52,615 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:50:52,627 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_81b8b65d-8e77-45f5-bbc8-8516a5793061/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c[755,768] [2021-11-25 19:50:52,657 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:50:52,670 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:50:52,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52 WrapperNode [2021-11-25 19:50:52,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:50:52,672 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:50:52,672 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:50:52,672 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:50:52,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,698 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,734 INFO L137 Inliner]: procedures = 17, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 148 [2021-11-25 19:50:52,735 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:50:52,736 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:50:52,736 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:50:52,737 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:50:52,744 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,745 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,757 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,764 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,770 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,787 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,789 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,791 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:50:52,792 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:50:52,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:50:52,795 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:50:52,803 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (1/1) ... [2021-11-25 19:50:52,811 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:50:52,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:50:52,834 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:50:52,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:50:52,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:50:52,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:50:52,882 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-25 19:50:52,883 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-25 19:50:52,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:50:52,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:50:52,883 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 19:50:52,884 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 19:50:52,952 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:50:52,953 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:50:53,223 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:50:53,352 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:50:53,352 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 19:50:53,359 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:50:53 BoogieIcfgContainer [2021-11-25 19:50:53,359 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:50:53,361 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:50:53,361 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:50:53,370 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:50:53,370 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:50:52" (1/3) ... [2021-11-25 19:50:53,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66724d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:50:53, skipping insertion in model container [2021-11-25 19:50:53,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:50:52" (2/3) ... [2021-11-25 19:50:53,397 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66724d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:50:53, skipping insertion in model container [2021-11-25 19:50:53,398 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:50:53" (3/3) ... [2021-11-25 19:50:53,399 INFO L111 eAbstractionObserver]: Analyzing ICFG soft_float_1-2a.c.cil.c [2021-11-25 19:50:53,404 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:50:53,405 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:50:53,469 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:50:53,476 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 19:50:53,477 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:50:53,494 INFO L276 IsEmpty]: Start isEmpty. Operand has 45 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 36 states have internal predecessors, (51), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:50:53,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 19:50:53,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:50:53,504 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:50:53,504 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:50:53,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:50:53,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1833966620, now seen corresponding path program 1 times [2021-11-25 19:50:53,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:50:53,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213305590] [2021-11-25 19:50:53,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:53,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:50:53,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:53,918 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:50:53,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:50:53,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213305590] [2021-11-25 19:50:53,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213305590] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:50:53,920 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:50:53,921 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:50:53,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918308422] [2021-11-25 19:50:53,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:50:53,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:50:53,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:50:53,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:50:53,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:50:53,967 INFO L87 Difference]: Start difference. First operand has 45 states, 33 states have (on average 1.5454545454545454) internal successors, (51), 36 states have internal predecessors, (51), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:50:54,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:50:54,226 INFO L93 Difference]: Finished difference Result 127 states and 210 transitions. [2021-11-25 19:50:54,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:50:54,229 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-11-25 19:50:54,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:50:54,237 INFO L225 Difference]: With dead ends: 127 [2021-11-25 19:50:54,237 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 19:50:54,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:50:54,244 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 50 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:50:54,245 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 370 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:50:54,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 19:50:54,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 49. [2021-11-25 19:50:54,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 36 states have (on average 1.3888888888888888) internal successors, (50), 38 states have internal predecessors, (50), 9 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-25 19:50:54,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 71 transitions. [2021-11-25 19:50:54,294 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 71 transitions. Word has length 24 [2021-11-25 19:50:54,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:50:54,294 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 71 transitions. [2021-11-25 19:50:54,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:50:54,298 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 71 transitions. [2021-11-25 19:50:54,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-25 19:50:54,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:50:54,302 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:50:54,303 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:50:54,303 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:50:54,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:50:54,304 INFO L85 PathProgramCache]: Analyzing trace with hash -295088481, now seen corresponding path program 1 times [2021-11-25 19:50:54,304 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:50:54,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124853059] [2021-11-25 19:50:54,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:54,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:50:54,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:54,507 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:50:54,507 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:50:54,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124853059] [2021-11-25 19:50:54,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124853059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:50:54,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:50:54,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:50:54,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247405861] [2021-11-25 19:50:54,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:50:54,510 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:50:54,510 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:50:54,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:50:54,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:50:54,511 INFO L87 Difference]: Start difference. First operand 49 states and 71 transitions. Second operand has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:50:54,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:50:54,618 INFO L93 Difference]: Finished difference Result 78 states and 111 transitions. [2021-11-25 19:50:54,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:50:54,619 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2021-11-25 19:50:54,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:50:54,621 INFO L225 Difference]: With dead ends: 78 [2021-11-25 19:50:54,621 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 19:50:54,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:50:54,623 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 16 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:50:54,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 296 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:50:54,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 19:50:54,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 61. [2021-11-25 19:50:54,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 47 states have internal predecessors, (65), 11 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (14), 12 states have call predecessors, (14), 10 states have call successors, (14) [2021-11-25 19:50:54,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 90 transitions. [2021-11-25 19:50:54,654 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 90 transitions. Word has length 27 [2021-11-25 19:50:54,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:50:54,655 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 90 transitions. [2021-11-25 19:50:54,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:50:54,656 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 90 transitions. [2021-11-25 19:50:54,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 19:50:54,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:50:54,659 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:50:54,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:50:54,660 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:50:54,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:50:54,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1692541996, now seen corresponding path program 1 times [2021-11-25 19:50:54,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:50:54,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725074511] [2021-11-25 19:50:54,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:54,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:50:54,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:55,041 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:50:55,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:50:55,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725074511] [2021-11-25 19:50:55,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [725074511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:50:55,043 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:50:55,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-25 19:50:55,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240301337] [2021-11-25 19:50:55,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:50:55,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:50:55,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:50:55,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:50:55,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:50:55,048 INFO L87 Difference]: Start difference. First operand 61 states and 90 transitions. Second operand has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:50:55,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:50:55,336 INFO L93 Difference]: Finished difference Result 93 states and 134 transitions. [2021-11-25 19:50:55,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 19:50:55,337 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-11-25 19:50:55,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:50:55,345 INFO L225 Difference]: With dead ends: 93 [2021-11-25 19:50:55,345 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 19:50:55,346 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:50:55,352 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 58 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:50:55,357 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 589 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:50:55,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 19:50:55,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 59. [2021-11-25 19:50:55,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 46 states have internal predecessors, (63), 11 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (13), 11 states have call predecessors, (13), 10 states have call successors, (13) [2021-11-25 19:50:55,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 87 transitions. [2021-11-25 19:50:55,379 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 87 transitions. Word has length 28 [2021-11-25 19:50:55,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:50:55,379 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 87 transitions. [2021-11-25 19:50:55,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.7) internal successors, (17), 10 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:50:55,380 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 87 transitions. [2021-11-25 19:50:55,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-25 19:50:55,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:50:55,383 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:50:55,383 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:50:55,383 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:50:55,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:50:55,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1250961361, now seen corresponding path program 1 times [2021-11-25 19:50:55,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:50:55,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925848028] [2021-11-25 19:50:55,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:55,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:50:55,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:55,587 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:50:55,588 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:50:55,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925848028] [2021-11-25 19:50:55,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925848028] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:50:55,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113401775] [2021-11-25 19:50:55,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:50:55,590 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:50:55,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:50:55,591 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:50:55,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:50:55,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:50:55,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 19:50:55,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:50:55,988 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:50:55,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:50:56,540 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:50:56,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113401775] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:50:56,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440926162] [2021-11-25 19:50:56,561 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-25 19:50:56,561 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:50:56,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:50:56,573 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:50:56,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:50:58,665 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 66 for LOIs [2021-11-25 19:51:00,633 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-25 19:51:00,768 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:51:11,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '909#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| Int) (|aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| Int) (|aux_div_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61| Int) (|aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| Int) (|aux_div_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| Int)) (and (< |aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| 4294967296) (< (+ |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| (* 4294967296 |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|)) 4294967296) (< |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| 4294967296) (< |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| |aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61|) (<= 0 |aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61|) (not (= (+ |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| (* 4294967296 |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|)) 0)) (= |__VERIFIER_assert_#in~cond| (ite (<= (ite (<= (mod (div (+ (* |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| 4294967296) (* |aux_div_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61| 4294967296) |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|) 16777216) 4294967296) 2147483647) (mod (div (+ (* |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| 4294967296) (* |aux_div_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61| 4294967296) |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|) 16777216) 4294967296) (+ (mod (div (+ (* |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| 4294967296) (* |aux_div_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61| 4294967296) |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|) 16777216) 4294967296) (- 4294967296))) (ite (<= (mod (div (+ |aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| (* |aux_div_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| 4294967296)) 16777216) 4294967296) 2147483647) (mod (div (+ |aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| (* |aux_div_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| 4294967296)) 16777216) 4294967296) (+ (- 4294967296) (mod (div (+ |aux_mod_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| (* |aux_div_v_ULTIMATE.start_addflt_~a#1_BEFORE_CALL_1_61| 4294967296)) 16777216) 4294967296)))) 1 0)) (or (and (= (+ (* 4294967296 |aux_div_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61|) |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| (* 4294967296 |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|)) 0) (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |#NULL.offset| 0) (= |#NULL.base| 0))) (<= 0 (+ |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72| (* 4294967296 |aux_div_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|))) (<= 0 |aux_mod_aux_mod_v_ULTIMATE.start_addflt_~b#1_BEFORE_CALL_1_61_72|))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:51:11,430 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:51:11,431 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:51:11,431 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 18 [2021-11-25 19:51:11,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120622655] [2021-11-25 19:51:11,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:51:11,432 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-25 19:51:11,432 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:51:11,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-25 19:51:11,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1137, Unknown=1, NotChecked=0, Total=1260 [2021-11-25 19:51:11,433 INFO L87 Difference]: Start difference. First operand 59 states and 87 transitions. Second operand has 18 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (9), 8 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 19:51:11,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:11,952 INFO L93 Difference]: Finished difference Result 145 states and 214 transitions. [2021-11-25 19:51:11,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:51:11,953 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (9), 8 states have call predecessors, (9), 5 states have call successors, (9) Word has length 28 [2021-11-25 19:51:11,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:11,954 INFO L225 Difference]: With dead ends: 145 [2021-11-25 19:51:11,954 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 19:51:11,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=186, Invalid=1793, Unknown=1, NotChecked=0, Total=1980 [2021-11-25 19:51:11,958 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 89 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 586 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:11,958 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 586 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:51:11,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 19:51:11,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 58. [2021-11-25 19:51:11,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 45 states have internal predecessors, (59), 9 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (12), 10 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-25 19:51:11,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 80 transitions. [2021-11-25 19:51:11,970 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 80 transitions. Word has length 28 [2021-11-25 19:51:11,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:11,970 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 80 transitions. [2021-11-25 19:51:11,971 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 6 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (9), 8 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-25 19:51:11,971 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 80 transitions. [2021-11-25 19:51:11,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-25 19:51:11,972 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:11,973 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:12,011 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:12,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:12,199 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:12,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:12,200 INFO L85 PathProgramCache]: Analyzing trace with hash 242985674, now seen corresponding path program 1 times [2021-11-25 19:51:12,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:51:12,200 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878063675] [2021-11-25 19:51:12,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:12,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:51:12,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:12,311 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:51:12,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:51:12,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878063675] [2021-11-25 19:51:12,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878063675] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:51:12,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210654943] [2021-11-25 19:51:12,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:12,312 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:12,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:51:12,313 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:51:12,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:51:12,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:12,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:51:12,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:12,544 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:51:12,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:12,773 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:51:12,773 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210654943] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:51:12,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1027645524] [2021-11-25 19:51:12,779 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-25 19:51:12,779 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:51:12,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:51:12,780 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:51:12,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:51:13,193 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-25 19:51:13,322 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:51:15,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1027645524] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:15,918 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:51:15,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [9, 11, 9] total 38 [2021-11-25 19:51:15,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54163188] [2021-11-25 19:51:15,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:15,920 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-25 19:51:15,920 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:51:15,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-25 19:51:15,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1273, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 19:51:15,921 INFO L87 Difference]: Start difference. First operand 58 states and 80 transitions. Second operand has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:51:18,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:18,998 INFO L93 Difference]: Finished difference Result 91 states and 125 transitions. [2021-11-25 19:51:18,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 19:51:18,999 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 31 [2021-11-25 19:51:18,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:19,000 INFO L225 Difference]: With dead ends: 91 [2021-11-25 19:51:19,000 INFO L226 Difference]: Without dead ends: 78 [2021-11-25 19:51:19,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=236, Invalid=2020, Unknown=0, NotChecked=0, Total=2256 [2021-11-25 19:51:19,003 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 128 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:19,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 155 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:51:19,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-25 19:51:19,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 57. [2021-11-25 19:51:19,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 45 states have internal predecessors, (58), 9 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (12), 9 states have call predecessors, (12), 8 states have call successors, (12) [2021-11-25 19:51:19,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 79 transitions. [2021-11-25 19:51:19,017 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 79 transitions. Word has length 31 [2021-11-25 19:51:19,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:19,018 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 79 transitions. [2021-11-25 19:51:19,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:51:19,018 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 79 transitions. [2021-11-25 19:51:19,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:51:19,020 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:19,020 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-25 19:51:19,057 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:19,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:19,236 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:19,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:19,236 INFO L85 PathProgramCache]: Analyzing trace with hash 2102854921, now seen corresponding path program 1 times [2021-11-25 19:51:19,236 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:51:19,236 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080557658] [2021-11-25 19:51:19,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:19,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:51:19,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:19,753 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:51:19,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:51:19,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080557658] [2021-11-25 19:51:19,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080557658] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:51:19,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960147466] [2021-11-25 19:51:19,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:19,754 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:19,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:51:19,758 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:51:19,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:51:19,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:19,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-25 19:51:19,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:20,272 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-25 19:51:20,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:24,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960147466] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:51:24,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1000747375] [2021-11-25 19:51:24,818 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2021-11-25 19:51:24,819 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:51:24,819 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:51:24,819 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:51:24,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:51:25,183 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2021-11-25 19:51:25,448 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2021-11-25 19:51:28,400 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 6 [2021-11-25 19:51:29,118 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 18 for LOIs [2021-11-25 19:51:29,132 INFO L197 IcfgInterpreter]: Interpreting procedure base2flt with input of size 60 for LOIs [2021-11-25 19:51:29,244 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:51:35,987 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1824#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:51:35,987 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:51:35,987 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:51:35,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 25 [2021-11-25 19:51:35,988 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86935273] [2021-11-25 19:51:35,988 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 19:51:35,988 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:51:35,989 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:51:35,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:51:35,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2363, Unknown=2, NotChecked=0, Total=2550 [2021-11-25 19:51:35,990 INFO L87 Difference]: Start difference. First operand 57 states and 79 transitions. Second operand has 25 states, 21 states have (on average 1.619047619047619) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:51:37,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:37,358 INFO L93 Difference]: Finished difference Result 86 states and 115 transitions. [2021-11-25 19:51:37,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:51:37,359 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 1.619047619047619) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 32 [2021-11-25 19:51:37,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:37,360 INFO L225 Difference]: With dead ends: 86 [2021-11-25 19:51:37,360 INFO L226 Difference]: Without dead ends: 65 [2021-11-25 19:51:37,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 852 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=335, Invalid=3695, Unknown=2, NotChecked=0, Total=4032 [2021-11-25 19:51:37,363 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 136 mSDsluCounter, 726 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 145 SdHoareTripleChecker+Valid, 700 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:37,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [145 Valid, 700 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 544 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:51:37,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-25 19:51:37,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 55. [2021-11-25 19:51:37,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 42 states have (on average 1.3571428571428572) internal successors, (57), 44 states have internal predecessors, (57), 8 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (9), 8 states have call predecessors, (9), 7 states have call successors, (9) [2021-11-25 19:51:37,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 74 transitions. [2021-11-25 19:51:37,376 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 74 transitions. Word has length 32 [2021-11-25 19:51:37,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:37,376 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 74 transitions. [2021-11-25 19:51:37,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 21 states have (on average 1.619047619047619) internal successors, (34), 20 states have internal predecessors, (34), 6 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:51:37,377 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 74 transitions. [2021-11-25 19:51:37,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:51:37,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:37,378 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-11-25 19:51:37,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:37,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:51:37,587 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:37,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:37,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1153759543, now seen corresponding path program 2 times [2021-11-25 19:51:37,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:51:37,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939243650] [2021-11-25 19:51:37,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:37,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:51:37,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:38,049 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:51:38,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:51:38,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939243650] [2021-11-25 19:51:38,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939243650] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:51:38,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353611289] [2021-11-25 19:51:38,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:51:38,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:38,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:51:38,051 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:51:38,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:51:38,098 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-25 19:51:38,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:51:38,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 19:51:38,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:38,552 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:51:38,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:38,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353611289] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:38,552 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:51:38,552 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [15] total 21 [2021-11-25 19:51:38,552 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201174167] [2021-11-25 19:51:38,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:38,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:51:38,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:51:38,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:51:38,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:51:38,554 INFO L87 Difference]: Start difference. First operand 55 states and 74 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:38,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:38,903 INFO L93 Difference]: Finished difference Result 71 states and 94 transitions. [2021-11-25 19:51:38,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:51:38,903 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 32 [2021-11-25 19:51:38,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:38,904 INFO L225 Difference]: With dead ends: 71 [2021-11-25 19:51:38,904 INFO L226 Difference]: Without dead ends: 53 [2021-11-25 19:51:38,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:51:38,906 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 51 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:38,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 316 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:38,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-25 19:51:38,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-25 19:51:38,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 42 states have internal predecessors, (51), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:51:38,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 69 transitions. [2021-11-25 19:51:38,927 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 69 transitions. Word has length 32 [2021-11-25 19:51:38,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:38,927 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 69 transitions. [2021-11-25 19:51:38,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:38,928 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 69 transitions. [2021-11-25 19:51:38,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:51:38,929 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:38,929 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:38,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:39,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:39,147 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:39,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:39,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1789743814, now seen corresponding path program 2 times [2021-11-25 19:51:39,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:51:39,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389781722] [2021-11-25 19:51:39,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:39,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:51:39,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 19:51:39,224 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-11-25 19:51:39,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-11-25 19:51:39,306 INFO L133 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2021-11-25 19:51:39,306 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-11-25 19:51:39,307 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 19:51:39,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-25 19:51:39,312 INFO L732 BasicCegarLoop]: Path program histogram: [2, 2, 1, 1, 1, 1] [2021-11-25 19:51:39,314 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-25 19:51:39,348 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 07:51:39 BoogieIcfgContainer [2021-11-25 19:51:39,348 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-25 19:51:39,349 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-25 19:51:39,349 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-25 19:51:39,349 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-25 19:51:39,350 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:50:53" (3/4) ... [2021-11-25 19:51:39,352 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-25 19:51:39,352 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-25 19:51:39,353 INFO L158 Benchmark]: Toolchain (without parser) took 47042.85ms. Allocated memory was 88.1MB in the beginning and 232.8MB in the end (delta: 144.7MB). Free memory was 51.5MB in the beginning and 119.5MB in the end (delta: -68.0MB). Peak memory consumption was 75.1MB. Max. memory is 16.1GB. [2021-11-25 19:51:39,353 INFO L158 Benchmark]: CDTParser took 0.24ms. Allocated memory is still 88.1MB. Free memory is still 68.9MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:51:39,354 INFO L158 Benchmark]: CACSL2BoogieTranslator took 350.13ms. Allocated memory is still 88.1MB. Free memory was 51.3MB in the beginning and 62.2MB in the end (delta: -10.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2021-11-25 19:51:39,354 INFO L158 Benchmark]: Boogie Procedure Inliner took 63.78ms. Allocated memory is still 88.1MB. Free memory was 62.2MB in the beginning and 60.4MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-25 19:51:39,354 INFO L158 Benchmark]: Boogie Preprocessor took 55.17ms. Allocated memory is still 88.1MB. Free memory was 60.1MB in the beginning and 58.7MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:51:39,356 INFO L158 Benchmark]: RCFGBuilder took 567.30ms. Allocated memory is still 88.1MB. Free memory was 58.7MB in the beginning and 38.2MB in the end (delta: 20.5MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-11-25 19:51:39,357 INFO L158 Benchmark]: TraceAbstraction took 45987.30ms. Allocated memory was 88.1MB in the beginning and 232.8MB in the end (delta: 144.7MB). Free memory was 37.6MB in the beginning and 119.5MB in the end (delta: -81.9MB). Peak memory consumption was 64.9MB. Max. memory is 16.1GB. [2021-11-25 19:51:39,357 INFO L158 Benchmark]: Witness Printer took 3.82ms. Allocated memory is still 232.8MB. Free memory is still 119.5MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-25 19:51:39,359 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24ms. Allocated memory is still 88.1MB. Free memory is still 68.9MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 350.13ms. Allocated memory is still 88.1MB. Free memory was 51.3MB in the beginning and 62.2MB in the end (delta: -10.9MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 63.78ms. Allocated memory is still 88.1MB. Free memory was 62.2MB in the beginning and 60.4MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 55.17ms. Allocated memory is still 88.1MB. Free memory was 60.1MB in the beginning and 58.7MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 567.30ms. Allocated memory is still 88.1MB. Free memory was 58.7MB in the beginning and 38.2MB in the end (delta: 20.5MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. * TraceAbstraction took 45987.30ms. Allocated memory was 88.1MB in the beginning and 232.8MB in the end (delta: 144.7MB). Free memory was 37.6MB in the beginning and 119.5MB in the end (delta: -81.9MB). Peak memory consumption was 64.9MB. Max. memory is 16.1GB. * Witness Printer took 3.82ms. Allocated memory is still 232.8MB. Free memory is still 119.5MB. There was no memory consumed. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 18]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of bitwiseOr at line 111, overapproximation of bitwiseAnd at line 109. Possible FailurePath: [L227] unsigned int a ; [L228] unsigned int ma = __VERIFIER_nondet_uint(); [L229] signed char ea = __VERIFIER_nondet_char(); [L230] unsigned int b ; [L231] unsigned int mb = __VERIFIER_nondet_uint(); [L232] signed char eb = __VERIFIER_nondet_char(); [L233] unsigned int r_add ; [L234] unsigned int zero ; [L235] int sa ; [L236] int sb ; [L237] int tmp ; [L238] int tmp___0 ; [L239] int tmp___1 ; [L240] int tmp___2 ; [L241] int tmp___3 ; [L242] int tmp___4 ; [L243] int tmp___5 ; [L244] int tmp___6 ; [L245] int tmp___7 ; [L246] int tmp___8 ; [L247] int tmp___9 ; [L248] int __retres23 ; VAL [ea=0, eb=0] [L252] CALL, EXPR base2flt(0, 0) VAL [\old(e)=0, \old(m)=0] [L26] unsigned int res ; [L27] unsigned int __retres4 ; VAL [\old(e)=0, \old(m)=0, e=0, m=0] [L30] COND TRUE ! m [L31] __retres4 = 0U VAL [\old(e)=0, \old(m)=0, __retres4=0, e=0, m=0] [L81] return (__retres4); [L252] RET, EXPR base2flt(0, 0) VAL [base2flt(0, 0)=0, ea=0, eb=0] [L252] zero = base2flt(0, 0) [L253] CALL, EXPR base2flt(ma, ea) VAL [\old(e)=0, \old(m)=16777216] [L26] unsigned int res ; [L27] unsigned int __retres4 ; VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L30] COND FALSE !(! m) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L36] COND FALSE !(m < 1U << 24U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L58] COND TRUE 1 VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L60] COND FALSE !(m >= 1U << 25U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L77] m = m & ~ (1U << 24U) [L78] res = m | ((unsigned int ) (e + 128) << 24U) [L79] __retres4 = res VAL [\old(e)=0, \old(m)=16777216, __retres4=1, e=0, res=1] [L81] return (__retres4); [L253] RET, EXPR base2flt(ma, ea) VAL [base2flt(ma, ea)=-72057589742960639, ea=0, eb=0, ma=16777216, zero=0] [L253] a = base2flt(ma, ea) [L254] CALL, EXPR base2flt(mb, eb) VAL [\old(e)=0, \old(m)=16777216] [L26] unsigned int res ; [L27] unsigned int __retres4 ; VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L30] COND FALSE !(! m) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L36] COND FALSE !(m < 1U << 24U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L58] COND TRUE 1 VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L60] COND FALSE !(m >= 1U << 25U) VAL [\old(e)=0, \old(m)=16777216, e=0, m=16777216] [L77] m = m & ~ (1U << 24U) [L78] res = m | ((unsigned int ) (e + 128) << 24U) [L79] __retres4 = res VAL [\old(e)=0, \old(m)=16777216, __retres4=33554431, e=0, res=33554431] [L81] return (__retres4); [L254] RET, EXPR base2flt(mb, eb) VAL [a=1, base2flt(mb, eb)=-72057598299340801, ea=0, eb=0, ma=16777216, mb=16777216, zero=0] [L254] b = base2flt(mb, eb) [L256] COND FALSE !(a < zero) [L259] COND TRUE a > zero [L260] tmp = 1 [L264] sa = tmp [L266] COND FALSE !(b < zero) [L269] COND TRUE b > zero [L270] tmp___0 = 1 [L274] sb = tmp___0 [L277] CALL addflt(a, b) [L85] unsigned int res ; [L86] unsigned int ma ; [L87] unsigned int mb ; [L88] unsigned int delta ; [L89] int ea ; [L90] int eb ; [L91] unsigned int tmp ; [L92] unsigned int __retres10 ; [L95] COND TRUE a < b [L96] tmp = a [L97] a = b [L98] b = tmp VAL [\old(a)=1, \old(b)=33554431, a=33554431, b=1, tmp=1] [L102] COND FALSE !(! b) [L109] ma = a & ((1U << 24U) - 1U) [L110] ea = (int )(a >> 24U) - 128 [L111] ma = ma | (1U << 24U) [L112] mb = b & ((1U << 24U) - 1U) [L113] eb = (int )(b >> 24U) - 128 [L114] mb = mb | (1U << 24U) VAL [\old(a)=1, \old(b)=33554431, a=33554431, b=1, ea=-383, eb=128, tmp=1] [L115] CALL __VERIFIER_assert(ea >= eb) VAL [\old(cond)=0] [L17] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L18] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 45 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 45.8s, OverallIterations: 8, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 6.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 570 SdHoareTripleChecker+Valid, 1.9s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 528 mSDsluCounter, 3012 SdHoareTripleChecker+Invalid, 1.6s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 2936 mSDsCounter, 86 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1822 IncrementalHoareTripleChecker+Invalid, 1908 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 86 mSolverCounterUnsat, 356 mSDtfsCounter, 1822 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 412 GetRequests, 204 SyntacticMatches, 4 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1810 ImplicationChecksByTransitivity, 29.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=61occurred in iteration=2, InterpolantAutomatonStates: 99, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 7 MinimizatonAttempts, 113 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 8.5s InterpolantComputationTime, 357 NumberOfCodeBlocks, 341 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 371 ConstructedInterpolants, 0 QuantifiedInterpolants, 1438 SizeOfPredicates, 50 NumberOfNonLiveVariables, 428 ConjunctsInSsa, 99 ConjunctsInUnsatCore, 13 InterpolantComputations, 4 PerfectInterpolantSequences, 114/156 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 0.5s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 2, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 24, DAG_INTERPRETER_EARLY_EXITS: 1, TOOLS_POST_APPLICATIONS: 24, TOOLS_POST_TIME: 0.2s, TOOLS_POST_CALL_APPLICATIONS: 9, TOOLS_POST_CALL_TIME: 0.1s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.1s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 39, TOOLS_QUANTIFIERELIM_TIME: 0.4s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.0s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 56, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 11, DOMAIN_JOIN_TIME: 0.1s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 24, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 1, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 223, DAG_COMPRESSION_RETAINED_NODES: 55, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces [2021-11-25 19:51:39,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/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_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/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 c9ff936057be59b0f479a8c37fd17409fe797633e9a8a05703f5728379735d91 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:51:41,831 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:51:41,834 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:51:41,893 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:51:41,894 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:51:41,898 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:51:41,901 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:51:41,906 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:51:41,909 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:51:41,916 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:51:41,918 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:51:41,919 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:51:41,920 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:51:41,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:51:41,924 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:51:41,928 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:51:41,930 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:51:41,931 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:51:41,933 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:51:41,943 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:51:41,945 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:51:41,946 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:51:41,949 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:51:41,951 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:51:41,955 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:51:41,955 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:51:41,956 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:51:41,958 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:51:41,958 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:51:41,959 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:51:41,960 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:51:41,961 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:51:41,963 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:51:41,963 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:51:41,965 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:51:41,965 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:51:41,966 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:51:41,966 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:51:41,967 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:51:41,968 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:51:41,969 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:51:41,970 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-25 19:51:42,013 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:51:42,013 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:51:42,014 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:51:42,014 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:51:42,015 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:51:42,015 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:51:42,015 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:51:42,016 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:51:42,016 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:51:42,016 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:51:42,017 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:51:42,017 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:51:42,019 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:51:42,019 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:51:42,019 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:51:42,019 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:51:42,020 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:51:42,020 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:51:42,020 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:51:42,020 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-25 19:51:42,021 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-25 19:51:42,021 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-25 19:51:42,021 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:51:42,021 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:51:42,021 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:51:42,022 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:51:42,022 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:51:42,022 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-25 19:51:42,022 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:51:42,023 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:51:42,023 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:51:42,023 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:51:42,024 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:51:42,024 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-25 19:51:42,024 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-25 19:51:42,025 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:51:42,025 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:51:42,025 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:51:42,026 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_81b8b65d-8e77-45f5-bbc8-8516a5793061/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c9ff936057be59b0f479a8c37fd17409fe797633e9a8a05703f5728379735d91 [2021-11-25 19:51:42,386 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:51:42,408 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:51:42,411 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:51:42,412 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:51:42,413 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:51:42,414 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c [2021-11-25 19:51:42,491 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/dbcfb39ff/0d27db59c8b747d5a25e03700c00f383/FLAGe7df152bf [2021-11-25 19:51:43,122 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:51:43,124 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c [2021-11-25 19:51:43,137 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/dbcfb39ff/0d27db59c8b747d5a25e03700c00f383/FLAGe7df152bf [2021-11-25 19:51:43,458 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/data/dbcfb39ff/0d27db59c8b747d5a25e03700c00f383 [2021-11-25 19:51:43,461 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:51:43,462 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:51:43,479 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:51:43,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:51:43,482 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:51:43,483 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,484 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fbc086b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43, skipping insertion in model container [2021-11-25 19:51:43,484 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,491 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:51:43,518 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:51:43,664 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_81b8b65d-8e77-45f5-bbc8-8516a5793061/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c[755,768] [2021-11-25 19:51:43,737 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:51:43,756 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:51:43,774 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_81b8b65d-8e77-45f5-bbc8-8516a5793061/sv-benchmarks/c/bitvector/soft_float_1-2a.c.cil.c[755,768] [2021-11-25 19:51:43,824 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:51:43,837 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:51:43,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43 WrapperNode [2021-11-25 19:51:43,838 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:51:43,839 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:51:43,839 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:51:43,839 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:51:43,846 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,857 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,886 INFO L137 Inliner]: procedures = 17, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 146 [2021-11-25 19:51:43,886 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:51:43,887 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:51:43,887 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:51:43,887 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:51:43,896 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,897 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,901 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,901 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,910 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,915 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,918 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,921 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:51:43,922 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:51:43,923 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:51:43,923 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:51:43,924 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (1/1) ... [2021-11-25 19:51:43,930 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:51:43,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:51:43,977 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:51:43,990 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:51:44,027 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:51:44,028 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-25 19:51:44,028 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2021-11-25 19:51:44,028 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2021-11-25 19:51:44,028 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:51:44,028 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:51:44,029 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 19:51:44,029 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 19:51:44,159 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:51:44,163 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:51:44,548 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:51:44,559 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:51:44,560 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 19:51:44,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:51:44 BoogieIcfgContainer [2021-11-25 19:51:44,562 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:51:44,564 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:51:44,564 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:51:44,567 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:51:44,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:51:43" (1/3) ... [2021-11-25 19:51:44,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477f8a8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:51:44, skipping insertion in model container [2021-11-25 19:51:44,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:51:43" (2/3) ... [2021-11-25 19:51:44,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477f8a8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:51:44, skipping insertion in model container [2021-11-25 19:51:44,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:51:44" (3/3) ... [2021-11-25 19:51:44,572 INFO L111 eAbstractionObserver]: Analyzing ICFG soft_float_1-2a.c.cil.c [2021-11-25 19:51:44,582 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:51:44,582 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:51:44,664 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:51:44,675 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 19:51:44,675 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:51:44,697 INFO L276 IsEmpty]: Start isEmpty. Operand has 72 states, 60 states have (on average 1.6) internal successors, (96), 63 states have internal predecessors, (96), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:51:44,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-25 19:51:44,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:44,706 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:44,707 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:44,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:44,718 INFO L85 PathProgramCache]: Analyzing trace with hash -760882007, now seen corresponding path program 1 times [2021-11-25 19:51:44,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:44,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1421929223] [2021-11-25 19:51:44,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:44,732 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:44,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:44,736 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:44,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-25 19:51:44,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:44,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:51:44,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:45,009 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:45,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:45,114 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:45,115 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:45,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1421929223] [2021-11-25 19:51:45,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1421929223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:51:45,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1552120165] [2021-11-25 19:51:45,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:45,117 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:51:45,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:51:45,120 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:51:45,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (3)] Waiting until timeout for monitored process [2021-11-25 19:51:45,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:45,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:51:45,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:45,332 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:45,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:45,422 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:45,422 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1552120165] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:51:45,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311596464] [2021-11-25 19:51:45,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:45,423 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:51:45,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:51:45,427 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:51:45,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:51:45,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:45,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:51:45,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:45,571 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:45,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:45,678 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:45,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311596464] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:51:45,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-25 19:51:45,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8, 8, 8, 8] total 10 [2021-11-25 19:51:45,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620392663] [2021-11-25 19:51:45,683 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-25 19:51:45,688 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:51:45,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:45,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:51:45,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:51:45,727 INFO L87 Difference]: Start difference. First operand has 72 states, 60 states have (on average 1.6) internal successors, (96), 63 states have internal predecessors, (96), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 19:51:46,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:46,411 INFO L93 Difference]: Finished difference Result 380 states and 641 transitions. [2021-11-25 19:51:46,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-25 19:51:46,416 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 32 [2021-11-25 19:51:46,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:46,443 INFO L225 Difference]: With dead ends: 380 [2021-11-25 19:51:46,444 INFO L226 Difference]: Without dead ends: 279 [2021-11-25 19:51:46,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:51:46,455 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 320 mSDsluCounter, 1452 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 1668 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:46,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [328 Valid, 1668 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:51:46,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2021-11-25 19:51:46,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 112. [2021-11-25 19:51:46,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 94 states have (on average 1.425531914893617) internal successors, (134), 95 states have internal predecessors, (134), 14 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (20), 16 states have call predecessors, (20), 13 states have call successors, (20) [2021-11-25 19:51:46,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 168 transitions. [2021-11-25 19:51:46,543 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 168 transitions. Word has length 32 [2021-11-25 19:51:46,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:46,544 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 168 transitions. [2021-11-25 19:51:46,545 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-25 19:51:46,545 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 168 transitions. [2021-11-25 19:51:46,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 19:51:46,552 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:46,552 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:46,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 19:51:46,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:46,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:47,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:47,154 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:47,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:47,155 INFO L85 PathProgramCache]: Analyzing trace with hash -1276417986, now seen corresponding path program 1 times [2021-11-25 19:51:47,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:47,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1160680168] [2021-11-25 19:51:47,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:47,157 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:47,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:47,163 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:47,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-25 19:51:47,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:47,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:51:47,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:47,350 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:47,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:47,350 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:47,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1160680168] [2021-11-25 19:51:47,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1160680168] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:47,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:47,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:51:47,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224092325] [2021-11-25 19:51:47,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:47,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:51:47,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:47,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:51:47,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:51:47,354 INFO L87 Difference]: Start difference. First operand 112 states and 168 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:47,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:47,463 INFO L93 Difference]: Finished difference Result 248 states and 373 transitions. [2021-11-25 19:51:47,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:51:47,464 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 40 [2021-11-25 19:51:47,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:47,468 INFO L225 Difference]: With dead ends: 248 [2021-11-25 19:51:47,469 INFO L226 Difference]: Without dead ends: 187 [2021-11-25 19:51:47,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:51:47,475 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 53 mSDsluCounter, 358 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 451 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:47,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 451 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:47,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-11-25 19:51:47,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2021-11-25 19:51:47,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 159 states have (on average 1.4150943396226414) internal successors, (225), 158 states have internal predecessors, (225), 20 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (26), 26 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 19:51:47,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 271 transitions. [2021-11-25 19:51:47,499 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 271 transitions. Word has length 40 [2021-11-25 19:51:47,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:47,500 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 271 transitions. [2021-11-25 19:51:47,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 5 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:47,500 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 271 transitions. [2021-11-25 19:51:47,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-25 19:51:47,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:47,503 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:47,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:47,720 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:47,720 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:47,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:47,721 INFO L85 PathProgramCache]: Analyzing trace with hash -596359616, now seen corresponding path program 1 times [2021-11-25 19:51:47,722 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:47,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2004447434] [2021-11-25 19:51:47,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:47,722 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:47,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:47,730 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:47,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-25 19:51:47,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:47,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:51:47,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:47,916 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:47,916 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:47,917 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:47,917 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2004447434] [2021-11-25 19:51:47,917 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2004447434] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:47,918 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:47,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:51:47,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478510560] [2021-11-25 19:51:47,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:47,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:51:47,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:47,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:51:47,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:51:47,924 INFO L87 Difference]: Start difference. First operand 183 states and 271 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:48,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:48,052 INFO L93 Difference]: Finished difference Result 256 states and 381 transitions. [2021-11-25 19:51:48,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:51:48,052 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 40 [2021-11-25 19:51:48,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:48,054 INFO L225 Difference]: With dead ends: 256 [2021-11-25 19:51:48,055 INFO L226 Difference]: Without dead ends: 201 [2021-11-25 19:51:48,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:51:48,059 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 105 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 536 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:48,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 536 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:48,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-11-25 19:51:48,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 174. [2021-11-25 19:51:48,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 152 states have (on average 1.394736842105263) internal successors, (212), 151 states have internal predecessors, (212), 18 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (24), 24 states have call predecessors, (24), 17 states have call successors, (24) [2021-11-25 19:51:48,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 254 transitions. [2021-11-25 19:51:48,088 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 254 transitions. Word has length 40 [2021-11-25 19:51:48,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:48,089 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 254 transitions. [2021-11-25 19:51:48,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:48,090 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 254 transitions. [2021-11-25 19:51:48,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 19:51:48,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:48,099 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 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 19:51:48,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:48,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:48,310 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:48,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:48,311 INFO L85 PathProgramCache]: Analyzing trace with hash -2082074321, now seen corresponding path program 1 times [2021-11-25 19:51:48,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:48,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2047216251] [2021-11-25 19:51:48,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:48,312 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:48,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:48,313 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:48,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-25 19:51:48,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:48,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:51:48,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:48,516 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:48,517 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:48,517 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:48,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2047216251] [2021-11-25 19:51:48,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2047216251] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:48,518 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:48,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:48,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839789002] [2021-11-25 19:51:48,518 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:48,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:48,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:48,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:48,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:48,520 INFO L87 Difference]: Start difference. First operand 174 states and 254 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:48,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:48,576 INFO L93 Difference]: Finished difference Result 321 states and 475 transitions. [2021-11-25 19:51:48,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:51:48,578 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 43 [2021-11-25 19:51:48,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:48,580 INFO L225 Difference]: With dead ends: 321 [2021-11-25 19:51:48,581 INFO L226 Difference]: Without dead ends: 255 [2021-11-25 19:51:48,589 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:48,591 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 68 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:48,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 338 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:51:48,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-11-25 19:51:48,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 223. [2021-11-25 19:51:48,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 199 states have (on average 1.3517587939698492) internal successors, (269), 198 states have internal predecessors, (269), 20 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (26), 26 states have call predecessors, (26), 19 states have call successors, (26) [2021-11-25 19:51:48,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 315 transitions. [2021-11-25 19:51:48,629 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 315 transitions. Word has length 43 [2021-11-25 19:51:48,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:48,631 INFO L470 AbstractCegarLoop]: Abstraction has 223 states and 315 transitions. [2021-11-25 19:51:48,632 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:48,632 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 315 transitions. [2021-11-25 19:51:48,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-25 19:51:48,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:48,635 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:48,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:48,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:48,847 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:48,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:48,849 INFO L85 PathProgramCache]: Analyzing trace with hash -1847325628, now seen corresponding path program 1 times [2021-11-25 19:51:48,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:48,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1584659474] [2021-11-25 19:51:48,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:48,850 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:48,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:48,852 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:48,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-25 19:51:48,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:48,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:51:48,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:49,010 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-25 19:51:49,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:49,010 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:49,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1584659474] [2021-11-25 19:51:49,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1584659474] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:49,011 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:49,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:49,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504075647] [2021-11-25 19:51:49,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:49,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:49,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:49,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:49,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:49,013 INFO L87 Difference]: Start difference. First operand 223 states and 315 transitions. Second operand has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:51:49,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:49,092 INFO L93 Difference]: Finished difference Result 367 states and 518 transitions. [2021-11-25 19:51:49,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:51:49,093 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2021-11-25 19:51:49,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:49,095 INFO L225 Difference]: With dead ends: 367 [2021-11-25 19:51:49,095 INFO L226 Difference]: Without dead ends: 147 [2021-11-25 19:51:49,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:49,097 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 25 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:49,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 247 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:49,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-25 19:51:49,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 135. [2021-11-25 19:51:49,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 119 states have (on average 1.3277310924369747) internal successors, (158), 121 states have internal predecessors, (158), 11 states have call successors, (11), 2 states have call predecessors, (11), 4 states have return successors, (16), 13 states have call predecessors, (16), 10 states have call successors, (16) [2021-11-25 19:51:49,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 185 transitions. [2021-11-25 19:51:49,110 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 185 transitions. Word has length 43 [2021-11-25 19:51:49,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:49,110 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 185 transitions. [2021-11-25 19:51:49,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-25 19:51:49,110 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 185 transitions. [2021-11-25 19:51:49,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 19:51:49,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:49,112 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:51:49,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:49,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:49,323 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:49,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:49,324 INFO L85 PathProgramCache]: Analyzing trace with hash 1563397194, now seen corresponding path program 1 times [2021-11-25 19:51:49,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:49,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1988826839] [2021-11-25 19:51:49,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:49,324 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:49,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:49,326 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:49,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-25 19:51:49,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:49,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:51:49,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:49,616 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:51:49,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:49,792 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:49,792 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:49,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1988826839] [2021-11-25 19:51:49,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1988826839] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:51:49,793 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:51:49,793 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-25 19:51:49,793 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227270136] [2021-11-25 19:51:49,793 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:49,793 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:51:49,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:49,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:51:49,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:51:49,794 INFO L87 Difference]: Start difference. First operand 135 states and 185 transitions. Second operand has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:50,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:50,254 INFO L93 Difference]: Finished difference Result 267 states and 392 transitions. [2021-11-25 19:51:50,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:51:50,255 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-25 19:51:50,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:50,257 INFO L225 Difference]: With dead ends: 267 [2021-11-25 19:51:50,257 INFO L226 Difference]: Without dead ends: 231 [2021-11-25 19:51:50,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-11-25 19:51:50,259 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 193 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:50,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 519 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 19:51:50,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-25 19:51:50,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 163. [2021-11-25 19:51:50,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 144 states have (on average 1.3194444444444444) internal successors, (190), 147 states have internal predecessors, (190), 14 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (19), 16 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-25 19:51:50,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 223 transitions. [2021-11-25 19:51:50,275 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 223 transitions. Word has length 44 [2021-11-25 19:51:50,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:50,276 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 223 transitions. [2021-11-25 19:51:50,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.833333333333333) internal successors, (29), 6 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:50,276 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 223 transitions. [2021-11-25 19:51:50,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 19:51:50,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:50,278 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:51:50,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:50,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:50,489 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:50,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:50,490 INFO L85 PathProgramCache]: Analyzing trace with hash -956562740, now seen corresponding path program 1 times [2021-11-25 19:51:50,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:50,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1067684786] [2021-11-25 19:51:50,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:50,491 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:50,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:50,492 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:50,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-25 19:51:50,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:50,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:51:50,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:50,644 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:50,644 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:50,644 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:50,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1067684786] [2021-11-25 19:51:50,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1067684786] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:50,645 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:50,645 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:51:50,645 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748104634] [2021-11-25 19:51:50,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:50,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:51:50,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:50,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:51:50,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:50,648 INFO L87 Difference]: Start difference. First operand 163 states and 223 transitions. Second operand has 5 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:50,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:50,679 INFO L93 Difference]: Finished difference Result 170 states and 229 transitions. [2021-11-25 19:51:50,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:51:50,680 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-25 19:51:50,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:50,685 INFO L225 Difference]: With dead ends: 170 [2021-11-25 19:51:50,685 INFO L226 Difference]: Without dead ends: 163 [2021-11-25 19:51:50,686 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:51:50,689 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 5 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:50,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 379 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:51:50,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2021-11-25 19:51:50,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2021-11-25 19:51:50,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 144 states have (on average 1.2986111111111112) internal successors, (187), 147 states have internal predecessors, (187), 14 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (19), 16 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-25 19:51:50,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 220 transitions. [2021-11-25 19:51:50,709 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 220 transitions. Word has length 44 [2021-11-25 19:51:50,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:50,709 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 220 transitions. [2021-11-25 19:51:50,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:50,710 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 220 transitions. [2021-11-25 19:51:50,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 19:51:50,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:50,711 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:51:50,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:50,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:50,923 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:50,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:50,924 INFO L85 PathProgramCache]: Analyzing trace with hash -261265623, now seen corresponding path program 2 times [2021-11-25 19:51:50,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:50,924 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [228894305] [2021-11-25 19:51:50,924 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-25 19:51:50,924 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:50,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:50,925 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:50,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-25 19:51:50,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-25 19:51:50,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:51:50,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-25 19:51:50,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:51,184 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:51:51,184 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:51,184 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:51,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [228894305] [2021-11-25 19:51:51,184 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [228894305] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:51,184 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:51,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:51:51,185 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350215638] [2021-11-25 19:51:51,185 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:51,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:51:51,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:51,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:51:51,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:51:51,186 INFO L87 Difference]: Start difference. First operand 163 states and 220 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:51,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:51,270 INFO L93 Difference]: Finished difference Result 202 states and 277 transitions. [2021-11-25 19:51:51,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:51:51,271 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-25 19:51:51,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:51,273 INFO L225 Difference]: With dead ends: 202 [2021-11-25 19:51:51,273 INFO L226 Difference]: Without dead ends: 200 [2021-11-25 19:51:51,273 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:51:51,274 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 38 mSDsluCounter, 463 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 592 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:51,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 592 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 10 Unchecked, 0.0s Time] [2021-11-25 19:51:51,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-25 19:51:51,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 167. [2021-11-25 19:51:51,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 147 states have (on average 1.2925170068027212) internal successors, (190), 150 states have internal predecessors, (190), 14 states have call successors, (14), 3 states have call predecessors, (14), 5 states have return successors, (19), 16 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-25 19:51:51,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 223 transitions. [2021-11-25 19:51:51,287 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 223 transitions. Word has length 44 [2021-11-25 19:51:51,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:51,287 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 223 transitions. [2021-11-25 19:51:51,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:51,287 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 223 transitions. [2021-11-25 19:51:51,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 19:51:51,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:51,289 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:51:51,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:51,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:51,499 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:51,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:51,499 INFO L85 PathProgramCache]: Analyzing trace with hash -204007321, now seen corresponding path program 1 times [2021-11-25 19:51:51,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:51,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1147869228] [2021-11-25 19:51:51,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:51,500 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:51,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:51,501 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:51,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-25 19:51:51,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:51,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:51:51,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:51,731 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:51:51,732 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:51,732 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:51,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1147869228] [2021-11-25 19:51:51,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1147869228] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:51,732 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:51,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:51:51,733 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [907292353] [2021-11-25 19:51:51,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:51,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:51:51,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:51,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:51:51,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:51:51,735 INFO L87 Difference]: Start difference. First operand 167 states and 223 transitions. Second operand has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:51,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:51,807 INFO L93 Difference]: Finished difference Result 212 states and 289 transitions. [2021-11-25 19:51:51,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:51:51,810 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 44 [2021-11-25 19:51:51,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:51,812 INFO L225 Difference]: With dead ends: 212 [2021-11-25 19:51:51,812 INFO L226 Difference]: Without dead ends: 210 [2021-11-25 19:51:51,813 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:51:51,813 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 38 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 463 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:51,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 463 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2021-11-25 19:51:51,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-11-25 19:51:51,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 171. [2021-11-25 19:51:51,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 150 states have (on average 1.2866666666666666) internal successors, (193), 153 states have internal predecessors, (193), 14 states have call successors, (14), 4 states have call predecessors, (14), 6 states have return successors, (19), 16 states have call predecessors, (19), 13 states have call successors, (19) [2021-11-25 19:51:51,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 226 transitions. [2021-11-25 19:51:51,839 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 226 transitions. Word has length 44 [2021-11-25 19:51:51,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:51,840 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 226 transitions. [2021-11-25 19:51:51,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.2) internal successors, (26), 5 states have internal predecessors, (26), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:51,840 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 226 transitions. [2021-11-25 19:51:51,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-25 19:51:51,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:51,842 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:51:51,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:52,050 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:52,051 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:52,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:52,051 INFO L85 PathProgramCache]: Analyzing trace with hash 561980754, now seen corresponding path program 1 times [2021-11-25 19:51:52,051 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:52,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1819581702] [2021-11-25 19:51:52,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:52,052 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:52,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:52,053 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:52,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-25 19:51:52,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:52,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:51:52,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:52,180 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:52,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:52,181 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:52,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1819581702] [2021-11-25 19:51:52,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1819581702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:52,181 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:52,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:52,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57022841] [2021-11-25 19:51:52,182 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:52,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:52,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:52,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:52,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:52,183 INFO L87 Difference]: Start difference. First operand 171 states and 226 transitions. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:52,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:52,221 INFO L93 Difference]: Finished difference Result 283 states and 384 transitions. [2021-11-25 19:51:52,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:51:52,222 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 45 [2021-11-25 19:51:52,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:52,224 INFO L225 Difference]: With dead ends: 283 [2021-11-25 19:51:52,224 INFO L226 Difference]: Without dead ends: 231 [2021-11-25 19:51:52,225 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:52,226 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 77 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:52,226 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 312 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:51:52,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-25 19:51:52,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 190. [2021-11-25 19:51:52,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 168 states have (on average 1.2916666666666667) internal successors, (217), 170 states have internal predecessors, (217), 15 states have call successors, (15), 4 states have call predecessors, (15), 6 states have return successors, (20), 17 states have call predecessors, (20), 14 states have call successors, (20) [2021-11-25 19:51:52,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 252 transitions. [2021-11-25 19:51:52,243 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 252 transitions. Word has length 45 [2021-11-25 19:51:52,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:52,244 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 252 transitions. [2021-11-25 19:51:52,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:52,244 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 252 transitions. [2021-11-25 19:51:52,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-25 19:51:52,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:52,246 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:51:52,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:52,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:52,458 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:52,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:52,459 INFO L85 PathProgramCache]: Analyzing trace with hash 2079579127, now seen corresponding path program 1 times [2021-11-25 19:51:52,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:52,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [714398462] [2021-11-25 19:51:52,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:52,459 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:52,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:52,460 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:52,462 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-25 19:51:52,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:52,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:51:52,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:52,588 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:52,588 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:52,588 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:52,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [714398462] [2021-11-25 19:51:52,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [714398462] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:52,589 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:52,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:52,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317987483] [2021-11-25 19:51:52,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:52,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:52,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:52,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:52,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:52,591 INFO L87 Difference]: Start difference. First operand 190 states and 252 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:52,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:52,633 INFO L93 Difference]: Finished difference Result 205 states and 268 transitions. [2021-11-25 19:51:52,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:51:52,634 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 48 [2021-11-25 19:51:52,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:52,636 INFO L225 Difference]: With dead ends: 205 [2021-11-25 19:51:52,636 INFO L226 Difference]: Without dead ends: 166 [2021-11-25 19:51:52,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:52,637 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 1 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:52,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 282 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:51:52,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-25 19:51:52,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2021-11-25 19:51:52,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 144 states have (on average 1.3055555555555556) internal successors, (188), 147 states have internal predecessors, (188), 15 states have call successors, (15), 4 states have call predecessors, (15), 6 states have return successors, (18), 16 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-25 19:51:52,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 221 transitions. [2021-11-25 19:51:52,649 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 221 transitions. Word has length 48 [2021-11-25 19:51:52,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:52,649 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 221 transitions. [2021-11-25 19:51:52,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:52,650 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 221 transitions. [2021-11-25 19:51:52,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:51:52,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:52,651 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:51:52,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:52,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:52,868 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:52,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:52,868 INFO L85 PathProgramCache]: Analyzing trace with hash -1609971577, now seen corresponding path program 1 times [2021-11-25 19:51:52,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:52,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [100764348] [2021-11-25 19:51:52,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:52,869 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:52,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:52,870 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:52,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-25 19:51:52,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:52,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:51:52,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:53,001 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:51:53,001 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:53,002 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:53,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [100764348] [2021-11-25 19:51:53,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [100764348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:53,002 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:53,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 19:51:53,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131635460] [2021-11-25 19:51:53,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:53,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:51:53,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:53,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:51:53,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:53,004 INFO L87 Difference]: Start difference. First operand 166 states and 221 transitions. Second operand has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:53,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:53,090 INFO L93 Difference]: Finished difference Result 241 states and 326 transitions. [2021-11-25 19:51:53,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:51:53,091 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 49 [2021-11-25 19:51:53,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:53,093 INFO L225 Difference]: With dead ends: 241 [2021-11-25 19:51:53,093 INFO L226 Difference]: Without dead ends: 199 [2021-11-25 19:51:53,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:51:53,095 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 141 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:53,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 332 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:53,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-11-25 19:51:53,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 166. [2021-11-25 19:51:53,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 144 states have (on average 1.2916666666666667) internal successors, (186), 147 states have internal predecessors, (186), 15 states have call successors, (15), 4 states have call predecessors, (15), 6 states have return successors, (18), 16 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-25 19:51:53,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 219 transitions. [2021-11-25 19:51:53,112 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 219 transitions. Word has length 49 [2021-11-25 19:51:53,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:53,112 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 219 transitions. [2021-11-25 19:51:53,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.2) internal successors, (31), 5 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:53,113 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 219 transitions. [2021-11-25 19:51:53,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-25 19:51:53,114 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:53,114 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:51:53,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:53,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:53,324 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:53,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:53,325 INFO L85 PathProgramCache]: Analyzing trace with hash -908906999, now seen corresponding path program 1 times [2021-11-25 19:51:53,325 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:53,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1042531602] [2021-11-25 19:51:53,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:53,325 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:53,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:53,327 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:53,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-25 19:51:53,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:53,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:51:53,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:53,455 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:51:53,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:53,455 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:53,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1042531602] [2021-11-25 19:51:53,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1042531602] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:53,456 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:53,456 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:53,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3262882] [2021-11-25 19:51:53,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:53,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:53,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:53,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:53,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:53,458 INFO L87 Difference]: Start difference. First operand 166 states and 219 transitions. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:53,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:53,539 INFO L93 Difference]: Finished difference Result 239 states and 312 transitions. [2021-11-25 19:51:53,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:51:53,540 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 49 [2021-11-25 19:51:53,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:53,542 INFO L225 Difference]: With dead ends: 239 [2021-11-25 19:51:53,542 INFO L226 Difference]: Without dead ends: 212 [2021-11-25 19:51:53,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:53,543 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 86 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:53,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 286 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:53,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-25 19:51:53,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 166. [2021-11-25 19:51:53,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 144 states have (on average 1.2847222222222223) internal successors, (185), 147 states have internal predecessors, (185), 15 states have call successors, (15), 4 states have call predecessors, (15), 6 states have return successors, (18), 16 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-25 19:51:53,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 218 transitions. [2021-11-25 19:51:53,559 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 218 transitions. Word has length 49 [2021-11-25 19:51:53,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:53,560 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 218 transitions. [2021-11-25 19:51:53,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:53,560 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 218 transitions. [2021-11-25 19:51:53,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:51:53,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:53,562 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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 19:51:53,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:53,773 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:53,774 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:53,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:53,774 INFO L85 PathProgramCache]: Analyzing trace with hash 1552744902, now seen corresponding path program 1 times [2021-11-25 19:51:53,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:53,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [346007920] [2021-11-25 19:51:53,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:53,775 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:53,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:53,776 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:53,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-25 19:51:53,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:53,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:51:53,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:53,974 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:53,974 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:53,974 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:53,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [346007920] [2021-11-25 19:51:53,974 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [346007920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:53,975 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:53,975 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:51:53,975 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294788692] [2021-11-25 19:51:53,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:53,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:51:53,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:53,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:51:53,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:51:53,976 INFO L87 Difference]: Start difference. First operand 166 states and 218 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:54,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:54,274 INFO L93 Difference]: Finished difference Result 270 states and 370 transitions. [2021-11-25 19:51:54,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:51:54,275 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 50 [2021-11-25 19:51:54,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:54,277 INFO L225 Difference]: With dead ends: 270 [2021-11-25 19:51:54,277 INFO L226 Difference]: Without dead ends: 246 [2021-11-25 19:51:54,277 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:51:54,278 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 180 mSDsluCounter, 454 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 572 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:54,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 572 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:51:54,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2021-11-25 19:51:54,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 199. [2021-11-25 19:51:54,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 173 states have (on average 1.283236994219653) internal successors, (222), 177 states have internal predecessors, (222), 19 states have call successors, (19), 4 states have call predecessors, (19), 6 states have return successors, (22), 20 states have call predecessors, (22), 18 states have call successors, (22) [2021-11-25 19:51:54,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 263 transitions. [2021-11-25 19:51:54,295 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 263 transitions. Word has length 50 [2021-11-25 19:51:54,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:54,296 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 263 transitions. [2021-11-25 19:51:54,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:54,296 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 263 transitions. [2021-11-25 19:51:54,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-25 19:51:54,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:54,298 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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 19:51:54,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:54,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:54,509 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:54,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:54,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1182826734, now seen corresponding path program 1 times [2021-11-25 19:51:54,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:54,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1268991542] [2021-11-25 19:51:54,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:54,510 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:54,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:54,510 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:54,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-25 19:51:54,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:54,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:51:54,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:54,642 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:54,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:54,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:54,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1268991542] [2021-11-25 19:51:54,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1268991542] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:54,643 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:54,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:54,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132508932] [2021-11-25 19:51:54,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:54,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:54,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:54,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:54,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:54,645 INFO L87 Difference]: Start difference. First operand 199 states and 263 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:54,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:54,685 INFO L93 Difference]: Finished difference Result 241 states and 312 transitions. [2021-11-25 19:51:54,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:51:54,686 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 50 [2021-11-25 19:51:54,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:54,687 INFO L225 Difference]: With dead ends: 241 [2021-11-25 19:51:54,687 INFO L226 Difference]: Without dead ends: 207 [2021-11-25 19:51:54,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:54,689 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 87 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:54,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 230 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:51:54,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-11-25 19:51:54,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 199. [2021-11-25 19:51:54,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 173 states have (on average 1.2138728323699421) internal successors, (210), 177 states have internal predecessors, (210), 19 states have call successors, (19), 4 states have call predecessors, (19), 6 states have return successors, (22), 20 states have call predecessors, (22), 18 states have call successors, (22) [2021-11-25 19:51:54,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 251 transitions. [2021-11-25 19:51:54,707 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 251 transitions. Word has length 50 [2021-11-25 19:51:54,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:54,707 INFO L470 AbstractCegarLoop]: Abstraction has 199 states and 251 transitions. [2021-11-25 19:51:54,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:54,708 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 251 transitions. [2021-11-25 19:51:54,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:51:54,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:54,709 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:54,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:54,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:54,921 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:54,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:54,922 INFO L85 PathProgramCache]: Analyzing trace with hash 1332385442, now seen corresponding path program 1 times [2021-11-25 19:51:54,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:54,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [142651487] [2021-11-25 19:51:54,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:54,923 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:54,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:54,924 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:54,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-25 19:51:54,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:54,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:51:54,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:55,097 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:55,098 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:55,098 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:55,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [142651487] [2021-11-25 19:51:55,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [142651487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:55,098 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:55,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:51:55,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327397846] [2021-11-25 19:51:55,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:55,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:51:55,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:55,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:51:55,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:51:55,100 INFO L87 Difference]: Start difference. First operand 199 states and 251 transitions. 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:55,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:55,129 INFO L93 Difference]: Finished difference Result 208 states and 259 transitions. [2021-11-25 19:51:55,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:51:55,130 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 52 [2021-11-25 19:51:55,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:55,131 INFO L225 Difference]: With dead ends: 208 [2021-11-25 19:51:55,131 INFO L226 Difference]: Without dead ends: 167 [2021-11-25 19:51:55,132 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:51:55,133 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 1 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:55,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 279 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:51:55,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-25 19:51:55,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 161. [2021-11-25 19:51:55,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 138 states have (on average 1.2246376811594204) internal successors, (169), 143 states have internal predecessors, (169), 16 states have call successors, (16), 4 states have call predecessors, (16), 6 states have return successors, (16), 15 states have call predecessors, (16), 14 states have call successors, (16) [2021-11-25 19:51:55,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 201 transitions. [2021-11-25 19:51:55,147 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 201 transitions. Word has length 52 [2021-11-25 19:51:55,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:55,147 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 201 transitions. [2021-11-25 19:51:55,147 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:55,147 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 201 transitions. [2021-11-25 19:51:55,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-25 19:51:55,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:55,149 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:51:55,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:55,364 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:55,365 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:55,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:55,365 INFO L85 PathProgramCache]: Analyzing trace with hash -444512686, now seen corresponding path program 1 times [2021-11-25 19:51:55,365 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:55,365 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1175970139] [2021-11-25 19:51:55,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:55,366 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:55,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:55,367 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:55,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-25 19:51:55,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:55,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:51:55,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:55,534 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:51:55,534 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:55,534 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:55,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1175970139] [2021-11-25 19:51:55,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1175970139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:55,535 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:55,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:51:55,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839631709] [2021-11-25 19:51:55,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:55,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:51:55,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:55,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:51:55,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:51:55,536 INFO L87 Difference]: Start difference. First operand 161 states and 201 transitions. Second operand has 6 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:55,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:55,736 INFO L93 Difference]: Finished difference Result 234 states and 301 transitions. [2021-11-25 19:51:55,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:51:55,737 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 52 [2021-11-25 19:51:55,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:55,739 INFO L225 Difference]: With dead ends: 234 [2021-11-25 19:51:55,739 INFO L226 Difference]: Without dead ends: 185 [2021-11-25 19:51:55,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:51:55,740 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 87 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:55,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 487 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:51:55,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-25 19:51:55,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 135. [2021-11-25 19:51:55,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 112 states have (on average 1.25) internal successors, (140), 117 states have internal predecessors, (140), 17 states have call successors, (17), 4 states have call predecessors, (17), 5 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:51:55,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 172 transitions. [2021-11-25 19:51:55,754 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 172 transitions. Word has length 52 [2021-11-25 19:51:55,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:55,754 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 172 transitions. [2021-11-25 19:51:55,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 6.333333333333333) internal successors, (38), 6 states have internal predecessors, (38), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-25 19:51:55,755 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 172 transitions. [2021-11-25 19:51:55,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-25 19:51:55,755 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:55,756 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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 19:51:55,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:55,967 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:55,967 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:55,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:55,968 INFO L85 PathProgramCache]: Analyzing trace with hash -71376074, now seen corresponding path program 1 times [2021-11-25 19:51:55,968 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:55,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [729007089] [2021-11-25 19:51:55,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:55,969 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:55,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:55,970 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:55,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-25 19:51:56,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:56,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:51:56,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:51:56,704 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:51:56,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:51:56,704 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:51:56,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [729007089] [2021-11-25 19:51:56,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [729007089] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:51:56,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:51:56,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:51:56,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602989297] [2021-11-25 19:51:56,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:51:56,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:51:56,705 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:51:56,705 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:51:56,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:51:56,706 INFO L87 Difference]: Start difference. First operand 135 states and 172 transitions. Second operand has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:51:56,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:51:56,740 INFO L93 Difference]: Finished difference Result 143 states and 181 transitions. [2021-11-25 19:51:56,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:51:56,741 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 54 [2021-11-25 19:51:56,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:51:56,742 INFO L225 Difference]: With dead ends: 143 [2021-11-25 19:51:56,742 INFO L226 Difference]: Without dead ends: 141 [2021-11-25 19:51:56,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:51:56,744 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 9 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 26 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:51:56,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 484 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 26 Unchecked, 0.0s Time] [2021-11-25 19:51:56,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-25 19:51:56,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-11-25 19:51:56,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 115 states have (on average 1.2434782608695651) internal successors, (143), 122 states have internal predecessors, (143), 19 states have call successors, (19), 5 states have call predecessors, (19), 6 states have return successors, (17), 14 states have call predecessors, (17), 17 states have call successors, (17) [2021-11-25 19:51:56,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 179 transitions. [2021-11-25 19:51:56,757 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 179 transitions. Word has length 54 [2021-11-25 19:51:56,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:51:56,758 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 179 transitions. [2021-11-25 19:51:56,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 7 states have internal predecessors, (34), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:51:56,758 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 179 transitions. [2021-11-25 19:51:56,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 19:51:56,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:51:56,759 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:51:56,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-25 19:51:56,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:51:56,970 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:51:56,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:51:56,971 INFO L85 PathProgramCache]: Analyzing trace with hash 1768875186, now seen corresponding path program 1 times [2021-11-25 19:51:56,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:51:56,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1555656145] [2021-11-25 19:51:56,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:51:56,972 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:51:56,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:51:56,973 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:51:56,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-25 19:51:57,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:51:57,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:51:57,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:01,466 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:52:01,466 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:01,466 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:01,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1555656145] [2021-11-25 19:52:01,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1555656145] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:01,467 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:01,467 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:52:01,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929096539] [2021-11-25 19:52:01,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:01,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:52:01,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:01,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:52:01,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=38, Unknown=2, NotChecked=0, Total=56 [2021-11-25 19:52:01,468 INFO L87 Difference]: Start difference. First operand 141 states and 179 transitions. Second operand has 8 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:52:01,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:01,562 INFO L93 Difference]: Finished difference Result 183 states and 233 transitions. [2021-11-25 19:52:01,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:52:01,563 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 55 [2021-11-25 19:52:01,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:01,564 INFO L225 Difference]: With dead ends: 183 [2021-11-25 19:52:01,564 INFO L226 Difference]: Without dead ends: 181 [2021-11-25 19:52:01,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=20, Invalid=50, Unknown=2, NotChecked=0, Total=72 [2021-11-25 19:52:01,565 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 37 mSDsluCounter, 495 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:01,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 599 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 35 Unchecked, 0.0s Time] [2021-11-25 19:52:01,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-11-25 19:52:01,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 139. [2021-11-25 19:52:01,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 115 states have (on average 1.2434782608695651) internal successors, (143), 120 states have internal predecessors, (143), 17 states have call successors, (17), 5 states have call predecessors, (17), 6 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:52:01,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 175 transitions. [2021-11-25 19:52:01,577 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 175 transitions. Word has length 55 [2021-11-25 19:52:01,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:01,578 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 175 transitions. [2021-11-25 19:52:01,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 5.0) internal successors, (35), 7 states have internal predecessors, (35), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:52:01,579 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 175 transitions. [2021-11-25 19:52:01,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-25 19:52:01,580 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:01,580 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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] [2021-11-25 19:52:01,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:01,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:01,793 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:01,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:01,794 INFO L85 PathProgramCache]: Analyzing trace with hash -2067393215, now seen corresponding path program 1 times [2021-11-25 19:52:01,794 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:01,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [252758448] [2021-11-25 19:52:01,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:01,794 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:01,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:01,797 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:01,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-25 19:52:01,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:01,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:52:01,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:02,659 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:52:02,660 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:02,660 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:02,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [252758448] [2021-11-25 19:52:02,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [252758448] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:02,660 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:02,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-25 19:52:02,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892418104] [2021-11-25 19:52:02,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:02,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:52:02,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:02,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:52:02,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:52:02,662 INFO L87 Difference]: Start difference. First operand 139 states and 175 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:52:04,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:04,408 INFO L93 Difference]: Finished difference Result 201 states and 256 transitions. [2021-11-25 19:52:04,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:52:04,410 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 58 [2021-11-25 19:52:04,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:04,411 INFO L225 Difference]: With dead ends: 201 [2021-11-25 19:52:04,411 INFO L226 Difference]: Without dead ends: 189 [2021-11-25 19:52:04,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-11-25 19:52:04,413 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 164 mSDsluCounter, 824 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 923 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:04,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 923 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:52:04,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-25 19:52:04,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 139. [2021-11-25 19:52:04,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 115 states have (on average 1.2260869565217392) internal successors, (141), 120 states have internal predecessors, (141), 17 states have call successors, (17), 5 states have call predecessors, (17), 6 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:52:04,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 173 transitions. [2021-11-25 19:52:04,429 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 173 transitions. Word has length 58 [2021-11-25 19:52:04,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:04,430 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 173 transitions. [2021-11-25 19:52:04,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:52:04,430 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 173 transitions. [2021-11-25 19:52:04,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 19:52:04,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:04,431 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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 19:52:04,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:04,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:04,643 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:04,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:04,643 INFO L85 PathProgramCache]: Analyzing trace with hash 589240327, now seen corresponding path program 1 times [2021-11-25 19:52:04,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:04,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1251387511] [2021-11-25 19:52:04,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:04,644 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:04,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:04,645 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:04,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-25 19:52:04,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:04,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:52:04,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:04,837 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:52:04,837 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:04,837 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:04,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1251387511] [2021-11-25 19:52:04,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1251387511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:04,838 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:04,838 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:52:04,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540431482] [2021-11-25 19:52:04,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:04,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:52:04,839 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:04,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:52:04,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:52:04,839 INFO L87 Difference]: Start difference. First operand 139 states and 173 transitions. Second operand has 6 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:52:04,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:04,945 INFO L93 Difference]: Finished difference Result 158 states and 193 transitions. [2021-11-25 19:52:04,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:52:04,946 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 60 [2021-11-25 19:52:04,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:04,947 INFO L225 Difference]: With dead ends: 158 [2021-11-25 19:52:04,947 INFO L226 Difference]: Without dead ends: 156 [2021-11-25 19:52:04,948 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:52:04,948 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 40 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:04,949 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 487 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:04,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-25 19:52:04,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 143. [2021-11-25 19:52:04,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 118 states have (on average 1.2203389830508475) internal successors, (144), 123 states have internal predecessors, (144), 17 states have call successors, (17), 6 states have call predecessors, (17), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:52:04,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 176 transitions. [2021-11-25 19:52:04,967 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 176 transitions. Word has length 60 [2021-11-25 19:52:04,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:04,968 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 176 transitions. [2021-11-25 19:52:04,968 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:52:04,968 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 176 transitions. [2021-11-25 19:52:04,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 19:52:04,969 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:04,970 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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 19:52:04,987 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:05,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:05,183 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:05,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:05,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1364362596, now seen corresponding path program 1 times [2021-11-25 19:52:05,184 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:05,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1856652020] [2021-11-25 19:52:05,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:05,184 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:05,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:05,185 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:05,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-25 19:52:05,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:05,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:52:05,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:05,897 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:52:05,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:05,898 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:05,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1856652020] [2021-11-25 19:52:05,898 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1856652020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:05,898 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:05,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-25 19:52:05,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901238381] [2021-11-25 19:52:05,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:05,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:52:05,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:05,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:52:05,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:52:05,900 INFO L87 Difference]: Start difference. First operand 143 states and 176 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:52:08,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:08,460 INFO L93 Difference]: Finished difference Result 371 states and 485 transitions. [2021-11-25 19:52:08,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 19:52:08,464 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 60 [2021-11-25 19:52:08,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:08,466 INFO L225 Difference]: With dead ends: 371 [2021-11-25 19:52:08,466 INFO L226 Difference]: Without dead ends: 339 [2021-11-25 19:52:08,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2021-11-25 19:52:08,468 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 432 mSDsluCounter, 923 mSDsCounter, 0 mSdLazyCounter, 627 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 438 SdHoareTripleChecker+Valid, 1048 SdHoareTripleChecker+Invalid, 679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 627 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:08,468 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [438 Valid, 1048 Invalid, 679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 627 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-25 19:52:08,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-11-25 19:52:08,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 169. [2021-11-25 19:52:08,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 141 states have (on average 1.2056737588652482) internal successors, (170), 147 states have internal predecessors, (170), 20 states have call successors, (20), 6 states have call predecessors, (20), 7 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 19:52:08,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 208 transitions. [2021-11-25 19:52:08,492 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 208 transitions. Word has length 60 [2021-11-25 19:52:08,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:08,493 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 208 transitions. [2021-11-25 19:52:08,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-25 19:52:08,493 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 208 transitions. [2021-11-25 19:52:08,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-25 19:52:08,494 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:08,495 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 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 19:52:08,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:08,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:08,706 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:08,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:08,706 INFO L85 PathProgramCache]: Analyzing trace with hash 865353347, now seen corresponding path program 1 times [2021-11-25 19:52:08,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:08,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1904368166] [2021-11-25 19:52:08,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:08,707 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:08,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:08,708 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:08,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-25 19:52:08,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:08,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:52:08,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:08,907 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:52:08,907 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:08,907 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:08,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1904368166] [2021-11-25 19:52:08,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1904368166] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:08,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:08,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:52:08,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837991699] [2021-11-25 19:52:08,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:08,909 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:52:08,909 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:08,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:52:08,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:52:08,909 INFO L87 Difference]: Start difference. First operand 169 states and 208 transitions. Second operand has 6 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:52:09,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:09,002 INFO L93 Difference]: Finished difference Result 191 states and 234 transitions. [2021-11-25 19:52:09,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:52:09,003 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 60 [2021-11-25 19:52:09,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:09,004 INFO L225 Difference]: With dead ends: 191 [2021-11-25 19:52:09,005 INFO L226 Difference]: Without dead ends: 189 [2021-11-25 19:52:09,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:52:09,006 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 34 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:09,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 484 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:09,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-25 19:52:09,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 174. [2021-11-25 19:52:09,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 144 states have (on average 1.2013888888888888) internal successors, (173), 151 states have internal predecessors, (173), 21 states have call successors, (21), 7 states have call predecessors, (21), 8 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 19:52:09,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 213 transitions. [2021-11-25 19:52:09,026 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 213 transitions. Word has length 60 [2021-11-25 19:52:09,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:09,026 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 213 transitions. [2021-11-25 19:52:09,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.0) internal successors, (40), 5 states have internal predecessors, (40), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-25 19:52:09,027 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 213 transitions. [2021-11-25 19:52:09,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:52:09,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:09,028 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:09,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:09,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:09,239 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:09,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:09,239 INFO L85 PathProgramCache]: Analyzing trace with hash 921322142, now seen corresponding path program 1 times [2021-11-25 19:52:09,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:09,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2087926353] [2021-11-25 19:52:09,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:09,240 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:09,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:09,241 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:09,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-25 19:52:09,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:09,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:52:09,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:10,582 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:10,582 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:10,583 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:10,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2087926353] [2021-11-25 19:52:10,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2087926353] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:10,583 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:10,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-25 19:52:10,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486480719] [2021-11-25 19:52:10,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:10,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:52:10,583 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:10,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:52:10,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:52:10,584 INFO L87 Difference]: Start difference. First operand 174 states and 213 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:11,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:11,404 INFO L93 Difference]: Finished difference Result 301 states and 380 transitions. [2021-11-25 19:52:11,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:52:11,405 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 65 [2021-11-25 19:52:11,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:11,407 INFO L225 Difference]: With dead ends: 301 [2021-11-25 19:52:11,407 INFO L226 Difference]: Without dead ends: 281 [2021-11-25 19:52:11,408 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:52:11,409 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 76 mSDsluCounter, 1073 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 1198 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 457 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:11,409 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 1198 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 457 Unchecked, 0.1s Time] [2021-11-25 19:52:11,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2021-11-25 19:52:11,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 182. [2021-11-25 19:52:11,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 151 states have (on average 1.205298013245033) internal successors, (182), 158 states have internal predecessors, (182), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 19:52:11,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 224 transitions. [2021-11-25 19:52:11,438 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 224 transitions. Word has length 65 [2021-11-25 19:52:11,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:11,439 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 224 transitions. [2021-11-25 19:52:11,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 13 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:11,439 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 224 transitions. [2021-11-25 19:52:11,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-25 19:52:11,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:11,440 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:11,456 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:11,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:11,653 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:11,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:11,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1450417120, now seen corresponding path program 1 times [2021-11-25 19:52:11,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:11,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1856283083] [2021-11-25 19:52:11,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:11,654 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:11,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:11,655 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:11,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-25 19:52:11,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:11,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:52:11,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:13,840 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:13,841 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:13,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:13,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1856283083] [2021-11-25 19:52:13,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1856283083] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:13,841 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:13,841 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-25 19:52:13,841 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147418755] [2021-11-25 19:52:13,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:13,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:52:13,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:13,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:52:13,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:52:13,842 INFO L87 Difference]: Start difference. First operand 182 states and 224 transitions. Second operand has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:13,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:13,946 INFO L93 Difference]: Finished difference Result 247 states and 309 transitions. [2021-11-25 19:52:13,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:52:13,947 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 65 [2021-11-25 19:52:13,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:13,951 INFO L225 Difference]: With dead ends: 247 [2021-11-25 19:52:13,951 INFO L226 Difference]: Without dead ends: 227 [2021-11-25 19:52:13,952 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:52:13,953 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 24 mSDsluCounter, 590 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 697 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 235 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:13,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 697 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 235 Unchecked, 0.0s Time] [2021-11-25 19:52:13,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-25 19:52:13,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 181. [2021-11-25 19:52:13,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 150 states have (on average 1.2) internal successors, (180), 157 states have internal predecessors, (180), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 19:52:13,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 222 transitions. [2021-11-25 19:52:13,985 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 222 transitions. Word has length 65 [2021-11-25 19:52:13,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:13,986 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 222 transitions. [2021-11-25 19:52:13,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.0) internal successors, (40), 10 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:13,986 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 222 transitions. [2021-11-25 19:52:13,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:52:13,991 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:13,992 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:14,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:14,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:14,205 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:14,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:14,205 INFO L85 PathProgramCache]: Analyzing trace with hash -957629534, now seen corresponding path program 1 times [2021-11-25 19:52:14,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:14,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [322885345] [2021-11-25 19:52:14,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:14,207 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:14,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:14,208 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:14,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-25 19:52:14,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:14,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-25 19:52:14,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:15,827 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:52:15,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:16,196 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:16,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [322885345] [2021-11-25 19:52:16,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [322885345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:52:16,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1162861131] [2021-11-25 19:52:16,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:16,197 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:52:16,197 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:52:16,203 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:52:16,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-25 19:52:16,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:16,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:52:16,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:24,602 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:24,602 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:24,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1162861131] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:24,602 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:52:24,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [15] total 22 [2021-11-25 19:52:24,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422082375] [2021-11-25 19:52:24,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:24,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:52:24,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:24,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:52:24,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=581, Unknown=3, NotChecked=0, Total=650 [2021-11-25 19:52:24,605 INFO L87 Difference]: Start difference. First operand 181 states and 222 transitions. Second operand has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 11 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:24,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:24,823 INFO L93 Difference]: Finished difference Result 294 states and 369 transitions. [2021-11-25 19:52:24,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:52:24,824 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 11 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 66 [2021-11-25 19:52:24,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:24,826 INFO L225 Difference]: With dead ends: 294 [2021-11-25 19:52:24,826 INFO L226 Difference]: Without dead ends: 274 [2021-11-25 19:52:24,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=70, Invalid=629, Unknown=3, NotChecked=0, Total=702 [2021-11-25 19:52:24,828 INFO L933 BasicCegarLoop]: 121 mSDtfsCounter, 49 mSDsluCounter, 860 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 981 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 268 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:24,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 981 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 268 Unchecked, 0.1s Time] [2021-11-25 19:52:24,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-11-25 19:52:24,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 183. [2021-11-25 19:52:24,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 152 states have (on average 1.2105263157894737) internal successors, (184), 159 states have internal predecessors, (184), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 19:52:24,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 226 transitions. [2021-11-25 19:52:24,864 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 226 transitions. Word has length 66 [2021-11-25 19:52:24,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:24,864 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 226 transitions. [2021-11-25 19:52:24,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.727272727272727) internal successors, (41), 11 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:24,866 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 226 transitions. [2021-11-25 19:52:24,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:52:24,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:24,868 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:24,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:25,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:25,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:25,277 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:25,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:25,278 INFO L85 PathProgramCache]: Analyzing trace with hash -660447408, now seen corresponding path program 1 times [2021-11-25 19:52:25,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:25,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2120379270] [2021-11-25 19:52:25,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:25,279 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:25,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:25,280 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:25,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-25 19:52:25,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:25,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-25 19:52:25,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:26,134 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:26,134 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:26,134 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:26,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2120379270] [2021-11-25 19:52:26,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2120379270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:26,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:26,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-25 19:52:26,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923388706] [2021-11-25 19:52:26,135 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:26,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 19:52:26,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:26,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 19:52:26,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:52:26,136 INFO L87 Difference]: Start difference. First operand 183 states and 226 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:27,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:27,671 INFO L93 Difference]: Finished difference Result 269 states and 335 transitions. [2021-11-25 19:52:27,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:52:27,675 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 66 [2021-11-25 19:52:27,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:27,677 INFO L225 Difference]: With dead ends: 269 [2021-11-25 19:52:27,678 INFO L226 Difference]: Without dead ends: 261 [2021-11-25 19:52:27,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:52:27,679 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 172 mSDsluCounter, 539 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 646 SdHoareTripleChecker+Invalid, 346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:27,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [172 Valid, 646 Invalid, 346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:52:27,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2021-11-25 19:52:27,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 184. [2021-11-25 19:52:27,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 153 states have (on average 1.2026143790849673) internal successors, (184), 160 states have internal predecessors, (184), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (20), 18 states have call predecessors, (20), 20 states have call successors, (20) [2021-11-25 19:52:27,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 226 transitions. [2021-11-25 19:52:27,704 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 226 transitions. Word has length 66 [2021-11-25 19:52:27,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:27,704 INFO L470 AbstractCegarLoop]: Abstraction has 184 states and 226 transitions. [2021-11-25 19:52:27,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 12 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:27,704 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 226 transitions. [2021-11-25 19:52:27,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 19:52:27,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:27,706 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:27,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:27,917 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:27,917 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:27,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:27,917 INFO L85 PathProgramCache]: Analyzing trace with hash -1467102624, now seen corresponding path program 1 times [2021-11-25 19:52:27,918 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:27,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1713426425] [2021-11-25 19:52:27,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:27,918 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:27,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:27,919 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:27,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-25 19:52:27,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:27,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-25 19:52:27,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:28,297 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:28,297 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:28,298 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:28,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1713426425] [2021-11-25 19:52:28,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1713426425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:28,298 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:28,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 19:52:28,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865957846] [2021-11-25 19:52:28,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:28,299 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:52:28,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:28,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:52:28,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:52:28,300 INFO L87 Difference]: Start difference. First operand 184 states and 226 transitions. Second operand has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:28,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:28,574 INFO L93 Difference]: Finished difference Result 287 states and 357 transitions. [2021-11-25 19:52:28,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:52:28,575 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 66 [2021-11-25 19:52:28,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:28,576 INFO L225 Difference]: With dead ends: 287 [2021-11-25 19:52:28,576 INFO L226 Difference]: Without dead ends: 267 [2021-11-25 19:52:28,577 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:52:28,577 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 71 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 693 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:28,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 693 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 79 Invalid, 0 Unknown, 122 Unchecked, 0.1s Time] [2021-11-25 19:52:28,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-25 19:52:28,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 174. [2021-11-25 19:52:28,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 145 states have (on average 1.186206896551724) internal successors, (172), 151 states have internal predecessors, (172), 20 states have call successors, (20), 7 states have call predecessors, (20), 8 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-25 19:52:28,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 210 transitions. [2021-11-25 19:52:28,602 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 210 transitions. Word has length 66 [2021-11-25 19:52:28,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:28,603 INFO L470 AbstractCegarLoop]: Abstraction has 174 states and 210 transitions. [2021-11-25 19:52:28,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.125) internal successors, (41), 8 states have internal predecessors, (41), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:28,603 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 210 transitions. [2021-11-25 19:52:28,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 19:52:28,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:28,605 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:28,627 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (32)] Ended with exit code 0 [2021-11-25 19:52:28,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:28,817 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:28,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:28,817 INFO L85 PathProgramCache]: Analyzing trace with hash 1151744600, now seen corresponding path program 1 times [2021-11-25 19:52:28,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:28,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [959762142] [2021-11-25 19:52:28,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:28,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:28,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:28,818 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:28,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-25 19:52:28,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:28,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:52:28,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:28,996 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:28,996 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:28,996 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:28,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [959762142] [2021-11-25 19:52:28,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [959762142] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:28,997 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:28,997 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:52:28,997 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488758964] [2021-11-25 19:52:28,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:28,998 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:52:28,998 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:28,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:52:28,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:52:28,998 INFO L87 Difference]: Start difference. First operand 174 states and 210 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 19:52:29,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:29,101 INFO L93 Difference]: Finished difference Result 209 states and 249 transitions. [2021-11-25 19:52:29,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:52:29,101 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 68 [2021-11-25 19:52:29,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:29,103 INFO L225 Difference]: With dead ends: 209 [2021-11-25 19:52:29,103 INFO L226 Difference]: Without dead ends: 195 [2021-11-25 19:52:29,105 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:52:29,112 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 30 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:29,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 469 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:29,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-25 19:52:29,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 170. [2021-11-25 19:52:29,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 139 states have (on average 1.1798561151079137) internal successors, (164), 148 states have internal predecessors, (164), 21 states have call successors, (21), 8 states have call predecessors, (21), 9 states have return successors, (19), 15 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-25 19:52:29,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 204 transitions. [2021-11-25 19:52:29,146 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 204 transitions. Word has length 68 [2021-11-25 19:52:29,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:29,146 INFO L470 AbstractCegarLoop]: Abstraction has 170 states and 204 transitions. [2021-11-25 19:52:29,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 19:52:29,147 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 204 transitions. [2021-11-25 19:52:29,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-25 19:52:29,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:29,148 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:29,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:29,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:29,360 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:29,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:29,360 INFO L85 PathProgramCache]: Analyzing trace with hash 106001302, now seen corresponding path program 1 times [2021-11-25 19:52:29,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:29,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1062114917] [2021-11-25 19:52:29,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:29,362 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:29,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:29,363 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:29,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-25 19:52:29,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:29,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:52:29,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:29,524 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:29,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:29,524 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:29,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1062114917] [2021-11-25 19:52:29,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1062114917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:29,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:29,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:52:29,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405285537] [2021-11-25 19:52:29,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:29,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:52:29,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:29,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:52:29,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:52:29,526 INFO L87 Difference]: Start difference. First operand 170 states and 204 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 19:52:29,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:29,599 INFO L93 Difference]: Finished difference Result 199 states and 236 transitions. [2021-11-25 19:52:29,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:52:29,600 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 68 [2021-11-25 19:52:29,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:29,601 INFO L225 Difference]: With dead ends: 199 [2021-11-25 19:52:29,601 INFO L226 Difference]: Without dead ends: 185 [2021-11-25 19:52:29,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 19:52:29,602 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 30 mSDsluCounter, 367 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:29,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 469 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:29,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-25 19:52:29,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 142. [2021-11-25 19:52:29,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 117 states have (on average 1.1965811965811965) internal successors, (140), 123 states have internal predecessors, (140), 16 states have call successors, (16), 7 states have call predecessors, (16), 8 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-25 19:52:29,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 171 transitions. [2021-11-25 19:52:29,625 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 171 transitions. Word has length 68 [2021-11-25 19:52:29,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:29,625 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 171 transitions. [2021-11-25 19:52:29,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-25 19:52:29,625 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 171 transitions. [2021-11-25 19:52:29,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:52:29,626 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:29,627 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:29,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:29,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:29,838 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:29,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:29,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1565040980, now seen corresponding path program 1 times [2021-11-25 19:52:29,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:29,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1288116962] [2021-11-25 19:52:29,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:29,839 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:29,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:29,840 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:29,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-25 19:52:29,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:29,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:52:29,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:30,051 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:30,051 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:30,051 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:30,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1288116962] [2021-11-25 19:52:30,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1288116962] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:30,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:30,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-25 19:52:30,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089142364] [2021-11-25 19:52:30,052 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:30,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:52:30,052 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:30,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:52:30,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:52:30,053 INFO L87 Difference]: Start difference. First operand 142 states and 171 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:52:30,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:30,110 INFO L93 Difference]: Finished difference Result 170 states and 200 transitions. [2021-11-25 19:52:30,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:52:30,110 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 70 [2021-11-25 19:52:30,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:30,111 INFO L225 Difference]: With dead ends: 170 [2021-11-25 19:52:30,111 INFO L226 Difference]: Without dead ends: 115 [2021-11-25 19:52:30,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:52:30,112 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 43 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:30,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 248 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:52:30,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-25 19:52:30,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 107. [2021-11-25 19:52:30,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 91 states have (on average 1.1538461538461537) internal successors, (105), 93 states have internal predecessors, (105), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:52:30,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 123 transitions. [2021-11-25 19:52:30,122 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 123 transitions. Word has length 70 [2021-11-25 19:52:30,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:30,122 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 123 transitions. [2021-11-25 19:52:30,122 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:52:30,122 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 123 transitions. [2021-11-25 19:52:30,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:52:30,123 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:30,123 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:30,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:30,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:30,334 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:30,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:30,335 INFO L85 PathProgramCache]: Analyzing trace with hash 1885920814, now seen corresponding path program 1 times [2021-11-25 19:52:30,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:30,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1936995688] [2021-11-25 19:52:30,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:30,335 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:30,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:30,336 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:30,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-25 19:52:30,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:30,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 19:52:30,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:30,567 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:52:30,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:31,515 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:31,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1936995688] [2021-11-25 19:52:31,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1936995688] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:52:31,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [303734061] [2021-11-25 19:52:31,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:31,516 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:52:31,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:52:31,523 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:52:31,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-25 19:52:31,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:31,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:52:31,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:31,892 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-25 19:52:31,892 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:31,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [303734061] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:31,893 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:52:31,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2021-11-25 19:52:31,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205208663] [2021-11-25 19:52:31,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:31,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:52:31,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:31,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:52:31,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=304, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:52:31,895 INFO L87 Difference]: Start difference. First operand 107 states and 123 transitions. Second operand has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:52:32,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:32,179 INFO L93 Difference]: Finished difference Result 175 states and 199 transitions. [2021-11-25 19:52:32,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:52:32,180 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 70 [2021-11-25 19:52:32,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:32,181 INFO L225 Difference]: With dead ends: 175 [2021-11-25 19:52:32,181 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 19:52:32,182 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:52:32,182 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 114 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:32,183 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 251 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:52:32,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 19:52:32,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 107. [2021-11-25 19:52:32,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 91 states have (on average 1.1428571428571428) internal successors, (104), 93 states have internal predecessors, (104), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:52:32,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 122 transitions. [2021-11-25 19:52:32,198 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 122 transitions. Word has length 70 [2021-11-25 19:52:32,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:32,199 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 122 transitions. [2021-11-25 19:52:32,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.8) internal successors, (44), 5 states have internal predecessors, (44), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-25 19:52:32,199 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 122 transitions. [2021-11-25 19:52:32,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:52:32,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:32,200 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:32,202 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (37)] Ended with exit code 0 [2021-11-25 19:52:32,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-11-25 19:52:32,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:32,602 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:32,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:32,602 INFO L85 PathProgramCache]: Analyzing trace with hash -2134286868, now seen corresponding path program 1 times [2021-11-25 19:52:32,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:32,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1200626309] [2021-11-25 19:52:32,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:32,603 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:32,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:32,604 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:32,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (38)] Waiting until timeout for monitored process [2021-11-25 19:52:32,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:32,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-25 19:52:32,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:33,335 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:52:33,335 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:33,335 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:33,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1200626309] [2021-11-25 19:52:33,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1200626309] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:33,336 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:33,336 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-25 19:52:33,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627212184] [2021-11-25 19:52:33,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:33,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:52:33,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:33,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:52:33,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:52:33,337 INFO L87 Difference]: Start difference. First operand 107 states and 122 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 10 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:33,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:33,511 INFO L93 Difference]: Finished difference Result 151 states and 174 transitions. [2021-11-25 19:52:33,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:52:33,512 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 10 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 70 [2021-11-25 19:52:33,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:33,513 INFO L225 Difference]: With dead ends: 151 [2021-11-25 19:52:33,514 INFO L226 Difference]: Without dead ends: 141 [2021-11-25 19:52:33,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:52:33,515 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 34 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 112 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:33,515 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 438 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 112 Unchecked, 0.0s Time] [2021-11-25 19:52:33,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-25 19:52:33,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 116. [2021-11-25 19:52:33,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 99 states have (on average 1.1313131313131313) internal successors, (112), 101 states have internal predecessors, (112), 11 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:52:33,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 132 transitions. [2021-11-25 19:52:33,538 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 132 transitions. Word has length 70 [2021-11-25 19:52:33,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:33,539 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 132 transitions. [2021-11-25 19:52:33,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 10 states have internal predecessors, (45), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-25 19:52:33,539 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 132 transitions. [2021-11-25 19:52:33,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-25 19:52:33,540 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:33,540 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:33,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (38)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:33,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:33,752 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:33,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:33,752 INFO L85 PathProgramCache]: Analyzing trace with hash -2093027486, now seen corresponding path program 1 times [2021-11-25 19:52:33,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:33,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1092793788] [2021-11-25 19:52:33,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:33,753 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:33,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:33,754 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:33,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-25 19:52:33,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:33,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:52:33,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:34,096 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 19:52:34,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:34,464 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:34,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1092793788] [2021-11-25 19:52:34,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1092793788] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:52:34,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1668325995] [2021-11-25 19:52:34,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:34,465 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-25 19:52:34,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 [2021-11-25 19:52:34,475 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-25 19:52:34,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-25 19:52:34,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:34,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:52:34,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:34,705 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:52:34,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:34,873 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 19:52:34,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1668325995] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:34,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562405445] [2021-11-25 19:52:34,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:34,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:52:34,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:52:34,874 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:52:34,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-25 19:52:34,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:34,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:52:34,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:35,039 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-25 19:52:35,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:52:35,229 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-25 19:52:35,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562405445] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:52:35,229 INFO L186 FreeRefinementEngine]: Found 0 perfect and 5 imperfect interpolant sequences. [2021-11-25 19:52:35,229 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8, 8, 8] total 11 [2021-11-25 19:52:35,229 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010425483] [2021-11-25 19:52:35,230 INFO L85 oduleStraightlineAll]: Using 5 imperfect interpolants to construct interpolant automaton [2021-11-25 19:52:35,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:52:35,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:35,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:52:35,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2021-11-25 19:52:35,231 INFO L87 Difference]: Start difference. First operand 116 states and 132 transitions. Second operand has 11 states, 11 states have (on average 5.454545454545454) internal successors, (60), 10 states have internal predecessors, (60), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:35,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:35,392 INFO L93 Difference]: Finished difference Result 128 states and 141 transitions. [2021-11-25 19:52:35,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:52:35,393 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.454545454545454) internal successors, (60), 10 states have internal predecessors, (60), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 69 [2021-11-25 19:52:35,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:35,393 INFO L225 Difference]: With dead ends: 128 [2021-11-25 19:52:35,393 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 19:52:35,394 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 361 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=322, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:52:35,394 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 28 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:35,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 558 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 42 Unchecked, 0.1s Time] [2021-11-25 19:52:35,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 19:52:35,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-25 19:52:35,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 56 states have internal predecessors, (63), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:52:35,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2021-11-25 19:52:35,404 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 69 [2021-11-25 19:52:35,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:35,404 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2021-11-25 19:52:35,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 5.454545454545454) internal successors, (60), 10 states have internal predecessors, (60), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:35,404 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2021-11-25 19:52:35,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 19:52:35,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:35,406 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:35,447 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:35,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-25 19:52:35,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (39)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:36,027 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:36,028 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:36,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:36,028 INFO L85 PathProgramCache]: Analyzing trace with hash 438339121, now seen corresponding path program 1 times [2021-11-25 19:52:36,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:36,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1128476678] [2021-11-25 19:52:36,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:36,029 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:36,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:36,030 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:36,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-25 19:52:36,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:36,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-25 19:52:36,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:37,751 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:52:37,751 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:37,751 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:37,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1128476678] [2021-11-25 19:52:37,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1128476678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:37,752 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:37,752 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-25 19:52:37,752 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910262142] [2021-11-25 19:52:37,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:37,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-25 19:52:37,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:37,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-25 19:52:37,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 19:52:37,753 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 11 states have internal predecessors, (43), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:37,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:37,839 INFO L93 Difference]: Finished difference Result 104 states and 119 transitions. [2021-11-25 19:52:37,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:52:37,840 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 11 states have internal predecessors, (43), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 73 [2021-11-25 19:52:37,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:37,841 INFO L225 Difference]: With dead ends: 104 [2021-11-25 19:52:37,841 INFO L226 Difference]: Without dead ends: 96 [2021-11-25 19:52:37,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:52:37,842 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 22 mSDsluCounter, 418 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 494 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:37,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 494 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 132 Unchecked, 0.0s Time] [2021-11-25 19:52:37,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-25 19:52:37,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 83. [2021-11-25 19:52:37,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 68 states have (on average 1.1323529411764706) internal successors, (77), 69 states have internal predecessors, (77), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:52:37,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 94 transitions. [2021-11-25 19:52:37,854 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 94 transitions. Word has length 73 [2021-11-25 19:52:37,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:37,854 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 94 transitions. [2021-11-25 19:52:37,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 11 states have internal predecessors, (43), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:37,855 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 94 transitions. [2021-11-25 19:52:37,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 19:52:37,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:37,856 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:37,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:38,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:38,066 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:38,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:38,067 INFO L85 PathProgramCache]: Analyzing trace with hash 696504559, now seen corresponding path program 1 times [2021-11-25 19:52:38,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:38,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2061219989] [2021-11-25 19:52:38,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:38,068 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:38,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:38,069 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:38,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-25 19:52:38,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:38,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-25 19:52:38,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:39,589 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:52:39,589 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:39,589 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:39,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2061219989] [2021-11-25 19:52:39,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2061219989] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:39,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:39,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-25 19:52:39,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344580542] [2021-11-25 19:52:39,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:39,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:52:39,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:39,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:52:39,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:52:39,592 INFO L87 Difference]: Start difference. First operand 83 states and 94 transitions. Second operand has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 14 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:39,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:39,685 INFO L93 Difference]: Finished difference Result 108 states and 121 transitions. [2021-11-25 19:52:39,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:52:39,686 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 14 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 73 [2021-11-25 19:52:39,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:39,687 INFO L225 Difference]: With dead ends: 108 [2021-11-25 19:52:39,687 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 19:52:39,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=32, Invalid=178, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:52:39,687 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 20 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 668 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 216 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:39,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 668 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 216 Unchecked, 0.0s Time] [2021-11-25 19:52:39,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 19:52:39,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 75. [2021-11-25 19:52:39,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 62 states have internal predecessors, (69), 8 states have call successors, (8), 5 states have call predecessors, (8), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-25 19:52:39,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 84 transitions. [2021-11-25 19:52:39,694 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 84 transitions. Word has length 73 [2021-11-25 19:52:39,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:39,694 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 84 transitions. [2021-11-25 19:52:39,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.2142857142857144) internal successors, (45), 14 states have internal predecessors, (45), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:39,695 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 84 transitions. [2021-11-25 19:52:39,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-25 19:52:39,695 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:39,696 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:39,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (43)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:39,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:39,900 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:39,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:39,900 INFO L85 PathProgramCache]: Analyzing trace with hash -405666381, now seen corresponding path program 1 times [2021-11-25 19:52:39,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:39,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [935756684] [2021-11-25 19:52:39,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:39,901 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:39,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:39,901 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:39,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (44)] Waiting until timeout for monitored process [2021-11-25 19:52:39,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:39,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-25 19:52:39,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:41,459 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:52:41,459 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:41,459 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:41,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [935756684] [2021-11-25 19:52:41,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [935756684] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:41,460 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:41,460 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-25 19:52:41,460 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480943166] [2021-11-25 19:52:41,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:41,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 19:52:41,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:41,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 19:52:41,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:52:41,461 INFO L87 Difference]: Start difference. First operand 75 states and 84 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:43,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:43,973 INFO L93 Difference]: Finished difference Result 107 states and 122 transitions. [2021-11-25 19:52:43,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:52:43,974 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 73 [2021-11-25 19:52:43,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:43,975 INFO L225 Difference]: With dead ends: 107 [2021-11-25 19:52:43,975 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 19:52:43,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-11-25 19:52:43,976 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 75 mSDsluCounter, 544 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 610 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:43,976 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 610 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 342 Invalid, 0 Unknown, 39 Unchecked, 1.0s Time] [2021-11-25 19:52:43,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 19:52:43,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 68. [2021-11-25 19:52:43,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 56 states have internal predecessors, (62), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:52:43,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 75 transitions. [2021-11-25 19:52:43,984 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 75 transitions. Word has length 73 [2021-11-25 19:52:43,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:43,985 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 75 transitions. [2021-11-25 19:52:43,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 14 states have internal predecessors, (43), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:43,985 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 75 transitions. [2021-11-25 19:52:43,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 19:52:43,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:43,986 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:43,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (44)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:44,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:44,196 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:44,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:44,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1028998347, now seen corresponding path program 1 times [2021-11-25 19:52:44,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:44,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [118975397] [2021-11-25 19:52:44,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:44,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:44,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:44,198 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:44,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-25 19:52:44,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:44,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:52:44,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:44,607 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:52:44,607 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:44,607 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:44,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [118975397] [2021-11-25 19:52:44,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [118975397] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:44,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:44,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 19:52:44,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989191120] [2021-11-25 19:52:44,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:44,608 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:52:44,608 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:44,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:52:44,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:52:44,609 INFO L87 Difference]: Start difference. First operand 68 states and 75 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:44,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:44,841 INFO L93 Difference]: Finished difference Result 96 states and 107 transitions. [2021-11-25 19:52:44,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:52:44,842 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 74 [2021-11-25 19:52:44,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:44,843 INFO L225 Difference]: With dead ends: 96 [2021-11-25 19:52:44,843 INFO L226 Difference]: Without dead ends: 88 [2021-11-25 19:52:44,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:52:44,844 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 26 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:44,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 491 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 72 Unchecked, 0.1s Time] [2021-11-25 19:52:44,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-25 19:52:44,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2021-11-25 19:52:44,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 69 states have (on average 1.1014492753623188) internal successors, (76), 70 states have internal predecessors, (76), 9 states have call successors, (9), 5 states have call predecessors, (9), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-11-25 19:52:44,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 93 transitions. [2021-11-25 19:52:44,854 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 93 transitions. Word has length 74 [2021-11-25 19:52:44,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:44,855 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 93 transitions. [2021-11-25 19:52:44,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 9 states have internal predecessors, (44), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:44,855 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 93 transitions. [2021-11-25 19:52:44,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 19:52:44,856 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:44,857 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:44,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:45,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:45,070 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:45,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:45,071 INFO L85 PathProgramCache]: Analyzing trace with hash -770832909, now seen corresponding path program 1 times [2021-11-25 19:52:45,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:45,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [892898712] [2021-11-25 19:52:45,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:45,071 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:45,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:45,072 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:45,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-25 19:52:45,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:45,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:52:45,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:46,104 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:52:46,104 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:46,104 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:46,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [892898712] [2021-11-25 19:52:46,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [892898712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:46,104 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:46,105 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-11-25 19:52:46,105 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683215866] [2021-11-25 19:52:46,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:46,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:52:46,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:46,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:52:46,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:52:46,106 INFO L87 Difference]: Start difference. First operand 84 states and 93 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:46,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:46,189 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2021-11-25 19:52:46,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-25 19:52:46,190 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 74 [2021-11-25 19:52:46,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:46,191 INFO L225 Difference]: With dead ends: 96 [2021-11-25 19:52:46,191 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 19:52:46,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:52:46,192 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 19 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 174 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:46,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 595 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 174 Unchecked, 0.0s Time] [2021-11-25 19:52:46,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 19:52:46,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-25 19:52:46,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 56 states have internal predecessors, (61), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:52:46,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-11-25 19:52:46,199 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 74 [2021-11-25 19:52:46,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:46,199 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-11-25 19:52:46,199 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 13 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:46,199 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-11-25 19:52:46,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 19:52:46,200 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:46,200 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:46,217 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (46)] Ended with exit code 0 [2021-11-25 19:52:46,411 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:46,411 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:46,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:46,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1423365133, now seen corresponding path program 1 times [2021-11-25 19:52:46,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:46,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1156132362] [2021-11-25 19:52:46,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:46,413 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:46,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:46,414 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:46,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-25 19:52:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:46,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:52:46,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:47,718 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-25 19:52:47,719 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:47,719 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:47,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1156132362] [2021-11-25 19:52:47,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1156132362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:47,720 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:47,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-11-25 19:52:47,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239242801] [2021-11-25 19:52:47,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:47,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-25 19:52:47,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:47,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-25 19:52:47,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:52:47,721 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:48,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:48,691 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2021-11-25 19:52:48,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-25 19:52:48,700 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 74 [2021-11-25 19:52:48,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:48,701 INFO L225 Difference]: With dead ends: 76 [2021-11-25 19:52:48,701 INFO L226 Difference]: Without dead ends: 68 [2021-11-25 19:52:48,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=76, Invalid=386, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:52:48,702 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 13 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 501 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:48,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 501 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 109 Invalid, 0 Unknown, 86 Unchecked, 0.2s Time] [2021-11-25 19:52:48,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-25 19:52:48,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-25 19:52:48,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 56 states have internal predecessors, (60), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-25 19:52:48,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 73 transitions. [2021-11-25 19:52:48,707 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 73 transitions. Word has length 74 [2021-11-25 19:52:48,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:48,707 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 73 transitions. [2021-11-25 19:52:48,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.933333333333333) internal successors, (44), 15 states have internal predecessors, (44), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:48,707 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 73 transitions. [2021-11-25 19:52:48,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-25 19:52:48,708 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:52:48,708 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:52:48,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (47)] Ended with exit code 0 [2021-11-25 19:52:48,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:48,919 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:52:48,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:52:48,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1165199695, now seen corresponding path program 1 times [2021-11-25 19:52:48,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-25 19:52:48,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1863643218] [2021-11-25 19:52:48,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:52:48,920 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-25 19:52:48,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat [2021-11-25 19:52:48,921 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-25 19:52:48,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-25 19:52:48,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:52:48,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-25 19:52:48,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:52:49,207 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:52:49,207 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:52:49,207 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-25 19:52:49,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1863643218] [2021-11-25 19:52:49,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1863643218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:52:49,207 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:52:49,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-25 19:52:49,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872511942] [2021-11-25 19:52:49,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:52:49,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:52:49,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-25 19:52:49,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:52:49,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:52:49,209 INFO L87 Difference]: Start difference. First operand 68 states and 73 transitions. Second operand has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 9 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:49,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:52:49,305 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-11-25 19:52:49,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:52:49,305 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 9 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 74 [2021-11-25 19:52:49,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:52:49,306 INFO L225 Difference]: With dead ends: 68 [2021-11-25 19:52:49,306 INFO L226 Difference]: Without dead ends: 0 [2021-11-25 19:52:49,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:52:49,307 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 8 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 38 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:52:49,307 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 325 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 38 Unchecked, 0.0s Time] [2021-11-25 19:52:49,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-25 19:52:49,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-25 19:52:49,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:52:49,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-25 19:52:49,308 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 74 [2021-11-25 19:52:49,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:52:49,308 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-25 19:52:49,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.111111111111111) internal successors, (46), 9 states have internal predecessors, (46), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-25 19:52:49,308 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-25 19:52:49,308 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-25 19:52:49,310 INFO L764 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-25 19:52:49,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-25 19:52:49,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81b8b65d-8e77-45f5-bbc8-8516a5793061/bin/utaipan-eEHZpOm5b7/mathsat -unsat_core_generation=3 [2021-11-25 19:52:49,512 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-25 19:53:49,144 WARN L227 SmtUtils]: Spent 59.63s on a formula simplification. DAG size of input: 262 DAG size of output: 246 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or) [2021-11-25 19:54:08,740 WARN L227 SmtUtils]: Spent 19.59s on a formula simplification that was a NOOP. DAG size: 305 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or) [2021-11-25 19:54:28,754 WARN L227 SmtUtils]: Spent 19.51s on a formula simplification that was a NOOP. DAG size: 295 (called from [L 182] de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.HoareAnnotationComposer.or)