./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6a47aea7 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl --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 50b0a90f24476d3b8404a11c5a11650cef36326e0b80eb9bfd0bc8b7617d7b0d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:28:28,833 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:28:28,837 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:28:28,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:28:28,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:28:28,880 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:28:28,882 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:28:28,890 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:28:28,893 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:28:28,899 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:28:28,901 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:28:28,903 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:28:28,903 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:28:28,906 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:28:28,911 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:28:28,917 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:28:28,919 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:28:28,920 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:28:28,926 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:28:28,928 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:28:28,930 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:28:28,934 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:28:28,937 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:28:28,938 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:28:28,945 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:28:28,945 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:28:28,946 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:28:28,947 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:28:28,948 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:28:28,949 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:28:28,949 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:28:28,950 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:28:28,951 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:28:28,952 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:28:28,954 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:28:28,954 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:28:28,955 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:28:28,955 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:28:28,955 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:28:28,956 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:28:28,957 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:28:28,958 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:28:28,986 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:28:28,986 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:28:28,986 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:28:28,987 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:28:28,987 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:28:28,987 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:28:28,988 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:28:28,988 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:28:28,988 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:28:28,988 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:28:28,989 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:28:28,989 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:28:28,989 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:28:28,989 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:28:28,989 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:28:28,990 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:28:28,990 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:28:28,990 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:28:28,991 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:28:28,991 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:28:28,991 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:28:28,991 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:28:28,992 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:28:28,992 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:28:28,992 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:28:28,992 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:28:28,992 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:28:28,993 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:28:28,993 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:28:28,993 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:28:28,993 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:28:28,993 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:28:28,994 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:28,994 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:28:28,994 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:28:28,994 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:28:28,995 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:28:28,995 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:28:28,995 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:28:28,995 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:28:28,995 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:28:28,996 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_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 50b0a90f24476d3b8404a11c5a11650cef36326e0b80eb9bfd0bc8b7617d7b0d [2021-11-23 17:28:29,243 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:28:29,265 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:28:29,268 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:28:29,269 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:28:29,270 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:28:29,271 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c [2021-11-23 17:28:29,364 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/63276e1bb/b7ca3f7797c3401797a449e6fc002e53/FLAGf6c8cf76f [2021-11-23 17:28:29,846 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:28:29,847 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c [2021-11-23 17:28:29,872 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/63276e1bb/b7ca3f7797c3401797a449e6fc002e53/FLAGf6c8cf76f [2021-11-23 17:28:30,193 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/63276e1bb/b7ca3f7797c3401797a449e6fc002e53 [2021-11-23 17:28:30,196 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:28:30,199 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:28:30,205 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:30,205 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:28:30,209 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:28:30,209 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,211 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ccc8242 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30, skipping insertion in model container [2021-11-23 17:28:30,212 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:28:30,274 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:28:30,528 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_19048ba8-5a39-43a0-9388-368d15175ec5/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c[8342,8355] [2021-11-23 17:28:30,531 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:30,543 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:28:30,616 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_19048ba8-5a39-43a0-9388-368d15175ec5/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c[8342,8355] [2021-11-23 17:28:30,630 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:30,654 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:28:30,654 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30 WrapperNode [2021-11-23 17:28:30,654 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:30,656 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:30,656 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:28:30,656 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:28:30,663 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,685 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,714 INFO L137 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 275 [2021-11-23 17:28:30,715 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:30,715 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:28:30,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:28:30,716 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:28:30,725 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,734 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,744 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,751 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,767 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,769 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,772 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:28:30,773 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:28:30,773 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:28:30,773 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:28:30,795 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:30" (1/1) ... [2021-11-23 17:28:30,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:30,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:30,840 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:28:30,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:28:30,890 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:28:30,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:28:30,891 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:28:30,891 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:28:30,999 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:28:31,001 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:28:31,472 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:28:31,504 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder has thrown an exception: java.lang.UnsupportedOperationException: Set is immutable at de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaBuilder.addBranchEncoders(TransFormulaBuilder.java:170) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.cfg.transitions.TransFormulaUtils.parallelComposition(TransFormulaUtils.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.ParallelComposition.(ParallelComposition.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CodeBlockFactory.constructParallelComposition(CodeBlockFactory.java:109) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.composeParallel(CfgBuilder.java:1792) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder$LargeBlockEncoding.(CfgBuilder.java:1653) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.cfg.CfgBuilder.createIcfg(CfgBuilder.java:280) at de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder.RCFGBuilderObserver.process(RCFGBuilderObserver.java:88) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.DFSTreeWalker.runObserver(DFSTreeWalker.java:65) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.runObserver(BaseWalker.java:93) at de.uni_freiburg.informatik.ultimate.core.coreplugin.modelwalker.BaseWalker.run(BaseWalker.java:86) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 17:28:31,521 INFO L158 Benchmark]: Toolchain (without parser) took 1321.12ms. Allocated memory is still 109.1MB. Free memory was 74.0MB in the beginning and 55.4MB in the end (delta: 18.6MB). Peak memory consumption was 16.0MB. Max. memory is 16.1GB. [2021-11-23 17:28:31,523 INFO L158 Benchmark]: CDTParser took 0.29ms. Allocated memory is still 109.1MB. Free memory was 64.7MB in the beginning and 64.7MB in the end (delta: 30.4kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:28:31,524 INFO L158 Benchmark]: CACSL2BoogieTranslator took 450.18ms. Allocated memory is still 109.1MB. Free memory was 73.7MB in the beginning and 80.6MB in the end (delta: -6.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 17:28:31,524 INFO L158 Benchmark]: Boogie Procedure Inliner took 59.18ms. Allocated memory is still 109.1MB. Free memory was 80.6MB in the beginning and 78.0MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:28:31,525 INFO L158 Benchmark]: Boogie Preprocessor took 56.89ms. Allocated memory is still 109.1MB. Free memory was 78.0MB in the beginning and 76.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:28:31,526 INFO L158 Benchmark]: RCFGBuilder took 746.18ms. Allocated memory is still 109.1MB. Free memory was 76.4MB in the beginning and 55.4MB in the end (delta: 21.0MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-11-23 17:28:31,531 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29ms. Allocated memory is still 109.1MB. Free memory was 64.7MB in the beginning and 64.7MB in the end (delta: 30.4kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 450.18ms. Allocated memory is still 109.1MB. Free memory was 73.7MB in the beginning and 80.6MB in the end (delta: -6.8MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 59.18ms. Allocated memory is still 109.1MB. Free memory was 80.6MB in the beginning and 78.0MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 56.89ms. Allocated memory is still 109.1MB. Free memory was 78.0MB in the beginning and 76.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 746.18ms. Allocated memory is still 109.1MB. Free memory was 76.4MB in the beginning and 55.4MB in the end (delta: 21.0MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: - ExceptionOrErrorResult: UnsupportedOperationException: Set is immutable de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: UnsupportedOperationException: Set is immutable: de.uni_freiburg.informatik.ultimate.util.datastructures.ImmutableSet.addAll(ImmutableSet.java:313) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 17:28:31,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/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_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl --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 50b0a90f24476d3b8404a11c5a11650cef36326e0b80eb9bfd0bc8b7617d7b0d --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:28:34,053 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:28:34,056 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:28:34,112 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:28:34,112 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:28:34,116 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:28:34,118 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:28:34,123 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:28:34,126 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:28:34,134 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:28:34,135 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:28:34,137 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:28:34,137 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:28:34,140 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:28:34,142 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:28:34,146 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:28:34,149 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:28:34,150 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:28:34,152 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:28:34,154 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:28:34,156 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:28:34,158 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:28:34,159 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:28:34,160 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:28:34,164 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:28:34,164 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:28:34,165 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:28:34,166 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:28:34,166 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:28:34,168 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:28:34,168 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:28:34,169 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:28:34,170 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:28:34,171 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:28:34,172 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:28:34,172 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:28:34,173 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:28:34,174 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:28:34,174 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:28:34,175 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:28:34,176 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:28:34,177 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:28:34,202 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:28:34,202 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:28:34,203 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:28:34,203 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:28:34,204 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:28:34,204 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:28:34,205 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:28:34,205 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:28:34,206 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:28:34,208 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:28:34,210 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:28:34,211 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:28:34,212 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:28:34,212 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:28:34,213 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:28:34,213 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:28:34,213 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:28:34,213 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:28:34,214 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:28:34,214 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:28:34,214 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:28:34,214 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:28:34,215 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:28:34,215 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:28:34,215 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:28:34,216 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:28:34,216 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:28:34,216 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:28:34,216 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:28:34,217 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:34,217 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:28:34,217 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:28:34,218 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:28:34,218 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:28:34,218 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:34,219 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:28:34,219 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:28:34,219 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:28:34,219 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_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 50b0a90f24476d3b8404a11c5a11650cef36326e0b80eb9bfd0bc8b7617d7b0d [2021-11-23 17:28:34,607 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:28:34,634 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:28:34,636 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:28:34,638 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:28:34,639 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:28:34,640 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c [2021-11-23 17:28:34,714 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/bd43adb47/f3a44809eaa44279a61bb83ed86c5ab1/FLAGdc018ed7e [2021-11-23 17:28:35,245 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:28:35,246 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c [2021-11-23 17:28:35,256 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/bd43adb47/f3a44809eaa44279a61bb83ed86c5ab1/FLAGdc018ed7e [2021-11-23 17:28:35,621 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/data/bd43adb47/f3a44809eaa44279a61bb83ed86c5ab1 [2021-11-23 17:28:35,625 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:28:35,627 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:28:35,630 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:35,631 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:28:35,634 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:28:35,636 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:35" (1/1) ... [2021-11-23 17:28:35,639 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52f00ccb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:35, skipping insertion in model container [2021-11-23 17:28:35,639 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:28:35" (1/1) ... [2021-11-23 17:28:35,647 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:28:35,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:28:35,875 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_19048ba8-5a39-43a0-9388-368d15175ec5/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c[8342,8355] [2021-11-23 17:28:35,878 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:35,891 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:28:35,982 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_19048ba8-5a39-43a0-9388-368d15175ec5/sv-benchmarks/c/seq-mthreaded/pals_lcr.4.1.ufo.UNBOUNDED.pals.c[8342,8355] [2021-11-23 17:28:35,983 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:28:36,001 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:28:36,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36 WrapperNode [2021-11-23 17:28:36,001 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:28:36,003 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:36,003 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:28:36,004 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:28:36,011 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,035 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,084 INFO L137 Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 261 [2021-11-23 17:28:36,091 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:28:36,092 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:28:36,093 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:28:36,093 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:28:36,101 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,102 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,112 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,130 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,150 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,153 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,156 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:28:36,157 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:28:36,157 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:28:36,170 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:28:36,171 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (1/1) ... [2021-11-23 17:28:36,181 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:28:36,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:36,207 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:28:36,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:28:36,260 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:28:36,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:28:36,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:28:36,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:28:36,384 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:28:36,385 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:28:36,746 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:28:36,754 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:28:36,754 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 17:28:36,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:28:36 BoogieIcfgContainer [2021-11-23 17:28:36,756 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:28:36,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:28:36,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:28:36,760 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:28:36,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:28:35" (1/3) ... [2021-11-23 17:28:36,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@496b3dfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:28:36, skipping insertion in model container [2021-11-23 17:28:36,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:28:36" (2/3) ... [2021-11-23 17:28:36,762 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@496b3dfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:28:36, skipping insertion in model container [2021-11-23 17:28:36,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:28:36" (3/3) ... [2021-11-23 17:28:36,764 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.4.1.ufo.UNBOUNDED.pals.c [2021-11-23 17:28:36,770 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:28:36,770 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:28:36,820 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:28:36,828 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 17:28:36,829 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:28:36,863 INFO L276 IsEmpty]: Start isEmpty. Operand has 79 states, 77 states have (on average 1.7012987012987013) internal successors, (131), 78 states have internal predecessors, (131), 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) [2021-11-23 17:28:36,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:28:36,873 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:36,874 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:36,874 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:36,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:36,886 INFO L85 PathProgramCache]: Analyzing trace with hash -171388107, now seen corresponding path program 1 times [2021-11-23 17:28:36,900 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:36,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [607506294] [2021-11-23 17:28:36,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:36,902 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:36,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:36,907 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:36,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:28:37,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:37,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 17:28:37,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:37,183 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:37,184 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:37,185 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:37,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [607506294] [2021-11-23 17:28:37,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [607506294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:37,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:37,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 17:28:37,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670277158] [2021-11-23 17:28:37,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:37,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 17:28:37,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:37,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 17:28:37,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:28:37,239 INFO L87 Difference]: Start difference. First operand has 79 states, 77 states have (on average 1.7012987012987013) internal successors, (131), 78 states have internal predecessors, (131), 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) Second operand has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 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) [2021-11-23 17:28:37,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:37,284 INFO L93 Difference]: Finished difference Result 126 states and 207 transitions. [2021-11-23 17:28:37,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 17:28:37,286 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 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) Word has length 29 [2021-11-23 17:28:37,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:37,297 INFO L225 Difference]: With dead ends: 126 [2021-11-23 17:28:37,297 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 17:28:37,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 17:28:37,304 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:37,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:37,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 17:28:37,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-23 17:28:37,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.6756756756756757) internal successors, (124), 74 states have internal predecessors, (124), 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) [2021-11-23 17:28:37,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 124 transitions. [2021-11-23 17:28:37,348 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 124 transitions. Word has length 29 [2021-11-23 17:28:37,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:37,349 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 124 transitions. [2021-11-23 17:28:37,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 14.5) internal successors, (29), 2 states have internal predecessors, (29), 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) [2021-11-23 17:28:37,350 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 124 transitions. [2021-11-23 17:28:37,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 17:28:37,351 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:37,352 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:37,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:37,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:37,566 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:37,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:37,568 INFO L85 PathProgramCache]: Analyzing trace with hash -305401613, now seen corresponding path program 1 times [2021-11-23 17:28:37,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:37,570 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [328761470] [2021-11-23 17:28:37,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:37,572 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:37,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:37,573 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:37,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:28:37,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:37,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:37,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:37,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:37,784 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:37,784 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:37,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [328761470] [2021-11-23 17:28:37,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [328761470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:37,785 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:37,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:37,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224403640] [2021-11-23 17:28:37,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:37,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:28:37,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:37,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:28:37,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:28:37,789 INFO L87 Difference]: Start difference. First operand 75 states and 124 transitions. Second operand has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 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) [2021-11-23 17:28:37,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:37,878 INFO L93 Difference]: Finished difference Result 125 states and 200 transitions. [2021-11-23 17:28:37,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:28:37,879 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 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) Word has length 29 [2021-11-23 17:28:37,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:37,880 INFO L225 Difference]: With dead ends: 125 [2021-11-23 17:28:37,881 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 17:28:37,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:37,883 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 3 mSDsluCounter, 340 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:37,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 462 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:37,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 17:28:37,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-23 17:28:37,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.364864864864865) internal successors, (101), 74 states have internal predecessors, (101), 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) [2021-11-23 17:28:37,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 101 transitions. [2021-11-23 17:28:37,894 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 101 transitions. Word has length 29 [2021-11-23 17:28:37,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:37,895 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 101 transitions. [2021-11-23 17:28:37,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.8) internal successors, (29), 5 states have internal predecessors, (29), 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) [2021-11-23 17:28:37,895 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 101 transitions. [2021-11-23 17:28:37,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:28:37,897 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:37,898 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:37,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:38,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:38,107 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:38,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:38,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1295954354, now seen corresponding path program 1 times [2021-11-23 17:28:38,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:38,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1126331001] [2021-11-23 17:28:38,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:38,108 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:38,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:38,109 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:38,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:28:38,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:38,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:38,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:38,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:38,408 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:38,408 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:38,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1126331001] [2021-11-23 17:28:38,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1126331001] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:38,409 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:38,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:38,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569956859] [2021-11-23 17:28:38,410 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:38,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:38,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:38,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:38,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:38,412 INFO L87 Difference]: Start difference. First operand 75 states and 101 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2021-11-23 17:28:38,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:38,438 INFO L93 Difference]: Finished difference Result 161 states and 235 transitions. [2021-11-23 17:28:38,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:38,439 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) Word has length 51 [2021-11-23 17:28:38,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:38,441 INFO L225 Difference]: With dead ends: 161 [2021-11-23 17:28:38,442 INFO L226 Difference]: Without dead ends: 115 [2021-11-23 17:28:38,442 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:38,444 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 58 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:38,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 217 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:38,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-23 17:28:38,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 113. [2021-11-23 17:28:38,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.4375) internal successors, (161), 112 states have internal predecessors, (161), 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) [2021-11-23 17:28:38,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 161 transitions. [2021-11-23 17:28:38,460 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 161 transitions. Word has length 51 [2021-11-23 17:28:38,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:38,461 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 161 transitions. [2021-11-23 17:28:38,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2021-11-23 17:28:38,461 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 161 transitions. [2021-11-23 17:28:38,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:28:38,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:38,464 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:38,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:38,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:38,677 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:38,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:38,678 INFO L85 PathProgramCache]: Analyzing trace with hash 1404728260, now seen corresponding path program 1 times [2021-11-23 17:28:38,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:38,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1951760010] [2021-11-23 17:28:38,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:38,683 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:38,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:38,684 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:38,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:28:38,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:38,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:38,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:38,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:38,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:38,940 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:38,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1951760010] [2021-11-23 17:28:38,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1951760010] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:38,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:38,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:38,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670136542] [2021-11-23 17:28:38,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:38,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:38,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:38,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:38,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:38,943 INFO L87 Difference]: Start difference. First operand 113 states and 161 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2021-11-23 17:28:38,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:38,989 INFO L93 Difference]: Finished difference Result 269 states and 405 transitions. [2021-11-23 17:28:38,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:38,990 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) Word has length 51 [2021-11-23 17:28:38,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:38,993 INFO L225 Difference]: With dead ends: 269 [2021-11-23 17:28:38,993 INFO L226 Difference]: Without dead ends: 185 [2021-11-23 17:28:38,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:38,996 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 54 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:38,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 216 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:39,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-23 17:28:39,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 183. [2021-11-23 17:28:39,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 182 states have (on average 1.4835164835164836) internal successors, (270), 182 states have internal predecessors, (270), 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) [2021-11-23 17:28:39,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 270 transitions. [2021-11-23 17:28:39,025 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 270 transitions. Word has length 51 [2021-11-23 17:28:39,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:39,025 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 270 transitions. [2021-11-23 17:28:39,026 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 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) [2021-11-23 17:28:39,026 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 270 transitions. [2021-11-23 17:28:39,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 17:28:39,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:39,028 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:39,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:39,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:39,231 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:39,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:39,232 INFO L85 PathProgramCache]: Analyzing trace with hash 1742521402, now seen corresponding path program 1 times [2021-11-23 17:28:39,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:39,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [157545097] [2021-11-23 17:28:39,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:39,233 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:39,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:39,238 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:39,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:28:39,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:39,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:39,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:40,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:40,050 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:40,051 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:40,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [157545097] [2021-11-23 17:28:40,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [157545097] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:40,058 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:40,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:28:40,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086180085] [2021-11-23 17:28:40,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:40,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:40,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:40,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:40,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:40,063 INFO L87 Difference]: Start difference. First operand 183 states and 270 transitions. Second operand has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 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) [2021-11-23 17:28:40,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:40,247 INFO L93 Difference]: Finished difference Result 953 states and 1475 transitions. [2021-11-23 17:28:40,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:28:40,248 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 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) Word has length 51 [2021-11-23 17:28:40,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:40,255 INFO L225 Difference]: With dead ends: 953 [2021-11-23 17:28:40,255 INFO L226 Difference]: Without dead ends: 799 [2021-11-23 17:28:40,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:40,259 INFO L933 BasicCegarLoop]: 95 mSDtfsCounter, 561 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 561 SdHoareTripleChecker+Valid, 375 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:40,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [561 Valid, 375 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:28:40,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-11-23 17:28:40,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 487. [2021-11-23 17:28:40,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 1.5185185185185186) internal successors, (738), 486 states have internal predecessors, (738), 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) [2021-11-23 17:28:40,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 738 transitions. [2021-11-23 17:28:40,309 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 738 transitions. Word has length 51 [2021-11-23 17:28:40,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:40,310 INFO L470 AbstractCegarLoop]: Abstraction has 487 states and 738 transitions. [2021-11-23 17:28:40,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 6 states have internal predecessors, (51), 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) [2021-11-23 17:28:40,310 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 738 transitions. [2021-11-23 17:28:40,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:28:40,312 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:40,313 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:40,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:40,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:40,524 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:40,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:40,525 INFO L85 PathProgramCache]: Analyzing trace with hash -1889876246, now seen corresponding path program 1 times [2021-11-23 17:28:40,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:40,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [324573862] [2021-11-23 17:28:40,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:40,526 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:40,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:40,527 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:40,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:28:40,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:40,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:40,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:40,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:40,758 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:40,758 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:40,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [324573862] [2021-11-23 17:28:40,759 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [324573862] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:40,759 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:40,759 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:40,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553709323] [2021-11-23 17:28:40,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:40,761 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:40,761 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:40,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:40,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:40,763 INFO L87 Difference]: Start difference. First operand 487 states and 738 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2021-11-23 17:28:40,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:40,821 INFO L93 Difference]: Finished difference Result 1339 states and 2044 transitions. [2021-11-23 17:28:40,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:40,822 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) Word has length 53 [2021-11-23 17:28:40,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:40,830 INFO L225 Difference]: With dead ends: 1339 [2021-11-23 17:28:40,830 INFO L226 Difference]: Without dead ends: 881 [2021-11-23 17:28:40,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:40,838 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 41 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:40,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 162 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:40,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 881 states. [2021-11-23 17:28:40,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 881 to 867. [2021-11-23 17:28:40,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 866 states have (on average 1.489607390300231) internal successors, (1290), 866 states have internal predecessors, (1290), 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) [2021-11-23 17:28:40,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1290 transitions. [2021-11-23 17:28:40,900 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1290 transitions. Word has length 53 [2021-11-23 17:28:40,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:40,901 INFO L470 AbstractCegarLoop]: Abstraction has 867 states and 1290 transitions. [2021-11-23 17:28:40,902 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2021-11-23 17:28:40,902 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1290 transitions. [2021-11-23 17:28:40,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 17:28:40,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:40,910 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:40,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:41,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:41,122 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:41,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:41,122 INFO L85 PathProgramCache]: Analyzing trace with hash -34468658, now seen corresponding path program 1 times [2021-11-23 17:28:41,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:41,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [423028637] [2021-11-23 17:28:41,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:41,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:41,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:41,124 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:41,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:28:41,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:41,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:41,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:41,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:41,299 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:41,299 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:41,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [423028637] [2021-11-23 17:28:41,299 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [423028637] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:41,300 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:41,300 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:41,300 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189742192] [2021-11-23 17:28:41,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:41,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:41,301 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:41,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:41,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:41,302 INFO L87 Difference]: Start difference. First operand 867 states and 1290 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2021-11-23 17:28:41,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:41,396 INFO L93 Difference]: Finished difference Result 2399 states and 3572 transitions. [2021-11-23 17:28:41,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:41,397 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) Word has length 53 [2021-11-23 17:28:41,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:41,408 INFO L225 Difference]: With dead ends: 2399 [2021-11-23 17:28:41,410 INFO L226 Difference]: Without dead ends: 1561 [2021-11-23 17:28:41,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:41,413 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 50 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:41,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 216 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:41,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1561 states. [2021-11-23 17:28:41,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1561 to 1559. [2021-11-23 17:28:41,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1559 states, 1558 states have (on average 1.467265725288832) internal successors, (2286), 1558 states have internal predecessors, (2286), 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) [2021-11-23 17:28:41,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1559 states to 1559 states and 2286 transitions. [2021-11-23 17:28:41,507 INFO L78 Accepts]: Start accepts. Automaton has 1559 states and 2286 transitions. Word has length 53 [2021-11-23 17:28:41,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:41,509 INFO L470 AbstractCegarLoop]: Abstraction has 1559 states and 2286 transitions. [2021-11-23 17:28:41,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 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) [2021-11-23 17:28:41,509 INFO L276 IsEmpty]: Start isEmpty. Operand 1559 states and 2286 transitions. [2021-11-23 17:28:41,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 17:28:41,512 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:41,512 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:41,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:41,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:41,722 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:41,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:41,723 INFO L85 PathProgramCache]: Analyzing trace with hash -1105013027, now seen corresponding path program 1 times [2021-11-23 17:28:41,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:41,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2088238436] [2021-11-23 17:28:41,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:41,724 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:41,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:41,730 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:41,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:28:41,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:41,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:28:41,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:41,896 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:41,900 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:41,901 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:41,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2088238436] [2021-11-23 17:28:41,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2088238436] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:41,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:41,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:41,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698325423] [2021-11-23 17:28:41,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:41,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:28:41,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:41,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:28:41,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:28:41,905 INFO L87 Difference]: Start difference. First operand 1559 states and 2286 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 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) [2021-11-23 17:28:42,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:42,126 INFO L93 Difference]: Finished difference Result 2834 states and 4117 transitions. [2021-11-23 17:28:42,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:42,127 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 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) Word has length 54 [2021-11-23 17:28:42,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:42,145 INFO L225 Difference]: With dead ends: 2834 [2021-11-23 17:28:42,145 INFO L226 Difference]: Without dead ends: 2832 [2021-11-23 17:28:42,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:28:42,147 INFO L933 BasicCegarLoop]: 141 mSDtfsCounter, 186 mSDsluCounter, 305 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:42,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 446 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:42,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2832 states. [2021-11-23 17:28:42,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2832 to 1655. [2021-11-23 17:28:42,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1655 states, 1654 states have (on average 1.4353083434099154) internal successors, (2374), 1654 states have internal predecessors, (2374), 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) [2021-11-23 17:28:42,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1655 states to 1655 states and 2374 transitions. [2021-11-23 17:28:42,285 INFO L78 Accepts]: Start accepts. Automaton has 1655 states and 2374 transitions. Word has length 54 [2021-11-23 17:28:42,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:42,286 INFO L470 AbstractCegarLoop]: Abstraction has 1655 states and 2374 transitions. [2021-11-23 17:28:42,286 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 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) [2021-11-23 17:28:42,287 INFO L276 IsEmpty]: Start isEmpty. Operand 1655 states and 2374 transitions. [2021-11-23 17:28:42,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 17:28:42,288 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:42,289 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:42,310 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:42,511 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:42,511 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:42,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:42,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1044582089, now seen corresponding path program 1 times [2021-11-23 17:28:42,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:42,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1372717110] [2021-11-23 17:28:42,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:42,513 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:42,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:42,514 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:42,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-23 17:28:42,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:42,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:42,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:42,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:42,703 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:42,703 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:42,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1372717110] [2021-11-23 17:28:42,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1372717110] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:42,703 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:42,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:42,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4232577] [2021-11-23 17:28:42,704 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:42,705 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:42,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:42,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:42,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:42,707 INFO L87 Difference]: Start difference. First operand 1655 states and 2374 transitions. Second operand has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 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) [2021-11-23 17:28:42,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:42,858 INFO L93 Difference]: Finished difference Result 3294 states and 4780 transitions. [2021-11-23 17:28:42,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:42,859 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 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) Word has length 55 [2021-11-23 17:28:42,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:42,873 INFO L225 Difference]: With dead ends: 3294 [2021-11-23 17:28:42,873 INFO L226 Difference]: Without dead ends: 2379 [2021-11-23 17:28:42,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:42,877 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 59 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:42,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 222 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:42,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2379 states. [2021-11-23 17:28:43,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2379 to 2377. [2021-11-23 17:28:43,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2377 states, 2376 states have (on average 1.4292929292929293) internal successors, (3396), 2376 states have internal predecessors, (3396), 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) [2021-11-23 17:28:43,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2377 states to 2377 states and 3396 transitions. [2021-11-23 17:28:43,076 INFO L78 Accepts]: Start accepts. Automaton has 2377 states and 3396 transitions. Word has length 55 [2021-11-23 17:28:43,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:43,077 INFO L470 AbstractCegarLoop]: Abstraction has 2377 states and 3396 transitions. [2021-11-23 17:28:43,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.333333333333332) internal successors, (55), 3 states have internal predecessors, (55), 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) [2021-11-23 17:28:43,077 INFO L276 IsEmpty]: Start isEmpty. Operand 2377 states and 3396 transitions. [2021-11-23 17:28:43,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 17:28:43,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:43,080 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:43,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:43,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:43,291 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:43,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:43,292 INFO L85 PathProgramCache]: Analyzing trace with hash -1276698888, now seen corresponding path program 1 times [2021-11-23 17:28:43,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:43,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [834228361] [2021-11-23 17:28:43,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:43,293 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:43,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:43,294 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:43,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 17:28:43,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:43,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:43,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:43,530 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:43,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:43,531 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:43,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [834228361] [2021-11-23 17:28:43,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [834228361] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:43,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:43,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:43,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444539436] [2021-11-23 17:28:43,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:43,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:43,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:43,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:43,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:43,533 INFO L87 Difference]: Start difference. First operand 2377 states and 3396 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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) [2021-11-23 17:28:43,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:43,662 INFO L93 Difference]: Finished difference Result 4039 states and 5805 transitions. [2021-11-23 17:28:43,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:43,663 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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) Word has length 78 [2021-11-23 17:28:43,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:43,673 INFO L225 Difference]: With dead ends: 4039 [2021-11-23 17:28:43,673 INFO L226 Difference]: Without dead ends: 1693 [2021-11-23 17:28:43,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:43,677 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 45 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:43,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 218 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:43,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1693 states. [2021-11-23 17:28:43,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1693 to 1691. [2021-11-23 17:28:43,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1691 states, 1690 states have (on average 1.4284023668639054) internal successors, (2414), 1690 states have internal predecessors, (2414), 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) [2021-11-23 17:28:43,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1691 states to 1691 states and 2414 transitions. [2021-11-23 17:28:43,809 INFO L78 Accepts]: Start accepts. Automaton has 1691 states and 2414 transitions. Word has length 78 [2021-11-23 17:28:43,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:43,810 INFO L470 AbstractCegarLoop]: Abstraction has 1691 states and 2414 transitions. [2021-11-23 17:28:43,810 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 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) [2021-11-23 17:28:43,810 INFO L276 IsEmpty]: Start isEmpty. Operand 1691 states and 2414 transitions. [2021-11-23 17:28:43,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:43,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:43,812 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:43,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:44,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:44,024 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:44,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:44,025 INFO L85 PathProgramCache]: Analyzing trace with hash -360968035, now seen corresponding path program 1 times [2021-11-23 17:28:44,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:44,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1065991397] [2021-11-23 17:28:44,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:44,026 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:44,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:44,027 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:44,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:28:44,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:44,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:44,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:45,210 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:45,210 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:45,908 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:45,908 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:45,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1065991397] [2021-11-23 17:28:45,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1065991397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:45,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1873347263] [2021-11-23 17:28:45,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:45,909 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:45,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:45,916 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:45,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:28:46,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:46,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:46,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:46,818 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:46,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:47,338 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:47,338 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1873347263] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:47,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295181400] [2021-11-23 17:28:47,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:47,339 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:47,339 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:47,341 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:47,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 17:28:47,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:47,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:47,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:48,099 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:48,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:48,553 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:48,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295181400] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:48,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:48,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:48,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077178941] [2021-11-23 17:28:48,555 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:48,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:48,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:48,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:48,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:48,557 INFO L87 Difference]: Start difference. First operand 1691 states and 2414 transitions. Second operand has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 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) [2021-11-23 17:28:48,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:48,805 INFO L93 Difference]: Finished difference Result 3352 states and 4798 transitions. [2021-11-23 17:28:48,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:28:48,806 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 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) Word has length 80 [2021-11-23 17:28:48,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:48,816 INFO L225 Difference]: With dead ends: 3352 [2021-11-23 17:28:48,816 INFO L226 Difference]: Without dead ends: 1718 [2021-11-23 17:28:48,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 461 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=298, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:28:48,821 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 72 mSDsluCounter, 661 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 743 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 90 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:48,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 743 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 90 Unchecked, 0.0s Time] [2021-11-23 17:28:48,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1718 states. [2021-11-23 17:28:48,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1718 to 1718. [2021-11-23 17:28:48,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1718 states, 1717 states have (on average 1.423412929528247) internal successors, (2444), 1717 states have internal predecessors, (2444), 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) [2021-11-23 17:28:48,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1718 states to 1718 states and 2444 transitions. [2021-11-23 17:28:48,933 INFO L78 Accepts]: Start accepts. Automaton has 1718 states and 2444 transitions. Word has length 80 [2021-11-23 17:28:48,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:48,933 INFO L470 AbstractCegarLoop]: Abstraction has 1718 states and 2444 transitions. [2021-11-23 17:28:48,934 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.6875) internal successors, (139), 15 states have internal predecessors, (139), 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) [2021-11-23 17:28:48,934 INFO L276 IsEmpty]: Start isEmpty. Operand 1718 states and 2444 transitions. [2021-11-23 17:28:48,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:48,935 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:48,936 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:48,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:49,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:49,368 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:49,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:49,561 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:49,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:49,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1015584653, now seen corresponding path program 1 times [2021-11-23 17:28:49,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:49,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [56422649] [2021-11-23 17:28:49,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:49,563 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:49,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:49,564 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:49,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:28:49,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:49,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:49,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:50,814 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:50,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:51,170 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:51,170 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:51,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [56422649] [2021-11-23 17:28:51,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [56422649] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:51,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1160443558] [2021-11-23 17:28:51,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:51,171 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:51,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:51,172 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:51,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 17:28:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:51,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:28:51,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:51,435 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:51,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1160443558] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:51,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:28:51,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8, 8] total 17 [2021-11-23 17:28:51,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553958232] [2021-11-23 17:28:51,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:51,437 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:51,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:51,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:51,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:28:51,438 INFO L87 Difference]: Start difference. First operand 1718 states and 2444 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-11-23 17:28:51,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:51,520 INFO L93 Difference]: Finished difference Result 2538 states and 3622 transitions. [2021-11-23 17:28:51,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:51,521 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) Word has length 80 [2021-11-23 17:28:51,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:51,526 INFO L225 Difference]: With dead ends: 2538 [2021-11-23 17:28:51,527 INFO L226 Difference]: Without dead ends: 904 [2021-11-23 17:28:51,529 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 17:28:51,530 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 37 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:51,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 197 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:51,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 904 states. [2021-11-23 17:28:51,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 904 to 902. [2021-11-23 17:28:51,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 902 states, 901 states have (on average 1.3940066592674807) internal successors, (1256), 901 states have internal predecessors, (1256), 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) [2021-11-23 17:28:51,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 902 states to 902 states and 1256 transitions. [2021-11-23 17:28:51,605 INFO L78 Accepts]: Start accepts. Automaton has 902 states and 1256 transitions. Word has length 80 [2021-11-23 17:28:51,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:51,605 INFO L470 AbstractCegarLoop]: Abstraction has 902 states and 1256 transitions. [2021-11-23 17:28:51,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-11-23 17:28:51,606 INFO L276 IsEmpty]: Start isEmpty. Operand 902 states and 1256 transitions. [2021-11-23 17:28:51,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:51,607 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:51,607 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:51,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:51,825 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:52,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:52,021 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:52,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:52,022 INFO L85 PathProgramCache]: Analyzing trace with hash 2061397245, now seen corresponding path program 1 times [2021-11-23 17:28:52,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:52,022 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [158225014] [2021-11-23 17:28:52,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:52,022 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:52,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:52,024 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:52,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:28:52,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:52,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:52,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:53,226 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:53,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:53,574 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:53,574 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:53,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [158225014] [2021-11-23 17:28:53,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [158225014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:53,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [683379966] [2021-11-23 17:28:53,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:53,575 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:53,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:53,576 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:53,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 17:28:53,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:53,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:53,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:54,673 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:54,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:54,923 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:54,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [683379966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:54,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1807306877] [2021-11-23 17:28:54,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:54,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:54,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:54,925 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:54,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 17:28:55,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:55,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:28:55,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:55,937 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:55,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:56,132 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:56,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1807306877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:56,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:56,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:28:56,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812285120] [2021-11-23 17:28:56,134 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:56,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:28:56,135 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:56,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:28:56,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:28:56,136 INFO L87 Difference]: Start difference. First operand 902 states and 1256 transitions. Second operand has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 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) [2021-11-23 17:28:56,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:56,314 INFO L93 Difference]: Finished difference Result 1756 states and 2465 transitions. [2021-11-23 17:28:56,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:28:56,315 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 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) Word has length 80 [2021-11-23 17:28:56,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:56,320 INFO L225 Difference]: With dead ends: 1756 [2021-11-23 17:28:56,321 INFO L226 Difference]: Without dead ends: 938 [2021-11-23 17:28:56,322 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=299, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:28:56,323 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 148 mSDsluCounter, 494 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:56,323 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 575 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 71 Unchecked, 0.0s Time] [2021-11-23 17:28:56,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 938 states. [2021-11-23 17:28:56,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 938 to 912. [2021-11-23 17:28:56,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 912 states, 911 states have (on average 1.394072447859495) internal successors, (1270), 911 states have internal predecessors, (1270), 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) [2021-11-23 17:28:56,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 912 states to 912 states and 1270 transitions. [2021-11-23 17:28:56,376 INFO L78 Accepts]: Start accepts. Automaton has 912 states and 1270 transitions. Word has length 80 [2021-11-23 17:28:56,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:56,377 INFO L470 AbstractCegarLoop]: Abstraction has 912 states and 1270 transitions. [2021-11-23 17:28:56,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.0625) internal successors, (145), 15 states have internal predecessors, (145), 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) [2021-11-23 17:28:56,377 INFO L276 IsEmpty]: Start isEmpty. Operand 912 states and 1270 transitions. [2021-11-23 17:28:56,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:56,378 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:56,379 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:56,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:56,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:56,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:57,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:57,003 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:57,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:57,003 INFO L85 PathProgramCache]: Analyzing trace with hash 467112563, now seen corresponding path program 1 times [2021-11-23 17:28:57,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:57,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [540444975] [2021-11-23 17:28:57,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:57,004 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:57,004 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:57,006 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:57,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-23 17:28:57,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:57,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:28:57,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:57,220 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:57,220 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:57,221 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:57,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [540444975] [2021-11-23 17:28:57,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [540444975] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:57,221 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:57,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:28:57,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453836091] [2021-11-23 17:28:57,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:57,222 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:28:57,222 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:57,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:28:57,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:57,223 INFO L87 Difference]: Start difference. First operand 912 states and 1270 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-11-23 17:28:57,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:57,256 INFO L93 Difference]: Finished difference Result 1324 states and 1854 transitions. [2021-11-23 17:28:57,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:28:57,257 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) Word has length 80 [2021-11-23 17:28:57,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:57,260 INFO L225 Difference]: With dead ends: 1324 [2021-11-23 17:28:57,260 INFO L226 Difference]: Without dead ends: 506 [2021-11-23 17:28:57,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:28:57,262 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 29 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:57,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 191 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:28:57,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-11-23 17:28:57,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 504. [2021-11-23 17:28:57,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3518886679920477) internal successors, (680), 503 states have internal predecessors, (680), 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) [2021-11-23 17:28:57,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 680 transitions. [2021-11-23 17:28:57,304 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 680 transitions. Word has length 80 [2021-11-23 17:28:57,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:57,304 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 680 transitions. [2021-11-23 17:28:57,305 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-11-23 17:28:57,305 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 680 transitions. [2021-11-23 17:28:57,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:57,306 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:57,306 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:57,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:57,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:57,519 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:57,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:57,519 INFO L85 PathProgramCache]: Analyzing trace with hash 298563487, now seen corresponding path program 1 times [2021-11-23 17:28:57,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:57,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1326443783] [2021-11-23 17:28:57,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:57,520 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:57,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:57,520 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:57,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 17:28:57,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:57,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:57,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:57,950 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 17:28:57,950 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:57,950 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:57,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1326443783] [2021-11-23 17:28:57,950 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1326443783] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:57,951 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:57,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:57,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477410826] [2021-11-23 17:28:57,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:57,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:57,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:57,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:57,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:57,953 INFO L87 Difference]: Start difference. First operand 504 states and 680 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 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) [2021-11-23 17:28:57,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:57,999 INFO L93 Difference]: Finished difference Result 927 states and 1270 transitions. [2021-11-23 17:28:57,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:58,000 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 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) Word has length 80 [2021-11-23 17:28:58,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:58,002 INFO L225 Difference]: With dead ends: 927 [2021-11-23 17:28:58,003 INFO L226 Difference]: Without dead ends: 504 [2021-11-23 17:28:58,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:58,011 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 30 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:58,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 182 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 18 Unchecked, 0.0s Time] [2021-11-23 17:28:58,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-23 17:28:58,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-23 17:28:58,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3499005964214712) internal successors, (679), 503 states have internal predecessors, (679), 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) [2021-11-23 17:28:58,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 679 transitions. [2021-11-23 17:28:58,043 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 679 transitions. Word has length 80 [2021-11-23 17:28:58,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:58,043 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 679 transitions. [2021-11-23 17:28:58,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 5 states have internal predecessors, (77), 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) [2021-11-23 17:28:58,044 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 679 transitions. [2021-11-23 17:28:58,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:58,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:58,046 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:58,059 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:58,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:58,258 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:58,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:58,258 INFO L85 PathProgramCache]: Analyzing trace with hash 62678687, now seen corresponding path program 1 times [2021-11-23 17:28:58,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:58,259 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2010849412] [2021-11-23 17:28:58,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:58,259 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:58,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:58,260 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:58,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:28:58,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:58,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:58,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:58,670 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:28:58,670 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:58,670 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:58,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2010849412] [2021-11-23 17:28:58,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2010849412] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:58,671 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:58,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:58,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396546947] [2021-11-23 17:28:58,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:58,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:58,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:58,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:58,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:58,672 INFO L87 Difference]: Start difference. First operand 504 states and 679 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 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) [2021-11-23 17:28:58,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:58,741 INFO L93 Difference]: Finished difference Result 931 states and 1274 transitions. [2021-11-23 17:28:58,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:58,742 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 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) Word has length 80 [2021-11-23 17:28:58,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:58,745 INFO L225 Difference]: With dead ends: 931 [2021-11-23 17:28:58,745 INFO L226 Difference]: Without dead ends: 504 [2021-11-23 17:28:58,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:58,747 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 28 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:58,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 226 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:28:58,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-23 17:28:58,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-23 17:28:58,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.3479125248508945) internal successors, (678), 503 states have internal predecessors, (678), 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) [2021-11-23 17:28:58,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 678 transitions. [2021-11-23 17:28:58,778 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 678 transitions. Word has length 80 [2021-11-23 17:28:58,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:58,778 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 678 transitions. [2021-11-23 17:28:58,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 5 states have internal predecessors, (76), 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) [2021-11-23 17:28:58,779 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 678 transitions. [2021-11-23 17:28:58,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:58,780 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:58,780 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:58,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:58,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:58,991 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:58,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:58,992 INFO L85 PathProgramCache]: Analyzing trace with hash 532518303, now seen corresponding path program 1 times [2021-11-23 17:28:58,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:58,992 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1579535891] [2021-11-23 17:28:58,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:58,992 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:58,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:58,993 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:58,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:28:59,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:59,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:59,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:59,437 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:28:59,437 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:28:59,438 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:59,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1579535891] [2021-11-23 17:28:59,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1579535891] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:28:59,438 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:28:59,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:28:59,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334821570] [2021-11-23 17:28:59,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:28:59,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:28:59,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:59,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:28:59,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:28:59,440 INFO L87 Difference]: Start difference. First operand 504 states and 678 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 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) [2021-11-23 17:28:59,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:28:59,502 INFO L93 Difference]: Finished difference Result 935 states and 1278 transitions. [2021-11-23 17:28:59,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:28:59,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 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) Word has length 80 [2021-11-23 17:28:59,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:28:59,507 INFO L225 Difference]: With dead ends: 935 [2021-11-23 17:28:59,508 INFO L226 Difference]: Without dead ends: 504 [2021-11-23 17:28:59,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:28:59,512 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 33 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 33 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:28:59,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 224 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 33 Unchecked, 0.0s Time] [2021-11-23 17:28:59,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-11-23 17:28:59,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2021-11-23 17:28:59,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.345924453280318) internal successors, (677), 503 states have internal predecessors, (677), 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) [2021-11-23 17:28:59,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 677 transitions. [2021-11-23 17:28:59,553 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 677 transitions. Word has length 80 [2021-11-23 17:28:59,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:28:59,553 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 677 transitions. [2021-11-23 17:28:59,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 5 states have internal predecessors, (75), 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) [2021-11-23 17:28:59,554 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 677 transitions. [2021-11-23 17:28:59,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-23 17:28:59,555 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:28:59,555 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:28:59,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:28:59,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:28:59,767 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:28:59,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:28:59,767 INFO L85 PathProgramCache]: Analyzing trace with hash -376486753, now seen corresponding path program 1 times [2021-11-23 17:28:59,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:28:59,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [686657484] [2021-11-23 17:28:59,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:59,768 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:28:59,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:28:59,768 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:28:59,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:28:59,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:59,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:28:59,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:00,179 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:29:00,180 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:00,180 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:00,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [686657484] [2021-11-23 17:29:00,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [686657484] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:00,180 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:00,181 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:29:00,181 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437919565] [2021-11-23 17:29:00,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:00,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:29:00,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:00,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:29:00,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:00,183 INFO L87 Difference]: Start difference. First operand 504 states and 677 transitions. Second operand has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 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) [2021-11-23 17:29:00,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:00,282 INFO L93 Difference]: Finished difference Result 914 states and 1254 transitions. [2021-11-23 17:29:00,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:29:00,283 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 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) Word has length 80 [2021-11-23 17:29:00,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:00,286 INFO L225 Difference]: With dead ends: 914 [2021-11-23 17:29:00,286 INFO L226 Difference]: Without dead ends: 479 [2021-11-23 17:29:00,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:29:00,287 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 26 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:00,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 217 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 9 Unchecked, 0.1s Time] [2021-11-23 17:29:00,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-11-23 17:29:00,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 479. [2021-11-23 17:29:00,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 1.3556485355648535) internal successors, (648), 478 states have internal predecessors, (648), 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) [2021-11-23 17:29:00,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 648 transitions. [2021-11-23 17:29:00,326 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 648 transitions. Word has length 80 [2021-11-23 17:29:00,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:00,326 INFO L470 AbstractCegarLoop]: Abstraction has 479 states and 648 transitions. [2021-11-23 17:29:00,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.333333333333334) internal successors, (74), 5 states have internal predecessors, (74), 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) [2021-11-23 17:29:00,327 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 648 transitions. [2021-11-23 17:29:00,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:29:00,328 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:00,328 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:00,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:00,538 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:00,539 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:00,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:00,539 INFO L85 PathProgramCache]: Analyzing trace with hash -877337902, now seen corresponding path program 1 times [2021-11-23 17:29:00,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:00,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [718340313] [2021-11-23 17:29:00,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:00,540 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:00,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:00,541 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:00,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:29:00,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:00,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:00,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:01,666 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:01,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:02,057 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:02,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:02,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [718340313] [2021-11-23 17:29:02,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [718340313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:02,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [570691829] [2021-11-23 17:29:02,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:02,058 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:02,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:02,058 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:02,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 17:29:02,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:02,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:02,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:03,047 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:03,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:03,284 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:03,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [570691829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:03,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42631923] [2021-11-23 17:29:03,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:03,284 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:03,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:03,285 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:03,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 17:29:03,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:03,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:03,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:04,197 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:04,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:04,448 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:04,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42631923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:04,448 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:04,449 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:29:04,449 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067511021] [2021-11-23 17:29:04,449 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:04,450 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:29:04,450 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:04,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:29:04,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:29:04,451 INFO L87 Difference]: Start difference. First operand 479 states and 648 transitions. Second operand has 16 states, 16 states have (on average 9.4375) internal successors, (151), 15 states have internal predecessors, (151), 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) [2021-11-23 17:29:04,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:04,597 INFO L93 Difference]: Finished difference Result 903 states and 1249 transitions. [2021-11-23 17:29:04,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:29:04,598 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.4375) internal successors, (151), 15 states have internal predecessors, (151), 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) Word has length 81 [2021-11-23 17:29:04,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:04,602 INFO L225 Difference]: With dead ends: 903 [2021-11-23 17:29:04,602 INFO L226 Difference]: Without dead ends: 493 [2021-11-23 17:29:04,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:29:04,604 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 133 mSDsluCounter, 589 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 671 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:04,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 671 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 81 Unchecked, 0.0s Time] [2021-11-23 17:29:04,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-11-23 17:29:04,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 491. [2021-11-23 17:29:04,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 1.3591836734693878) internal successors, (666), 490 states have internal predecessors, (666), 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) [2021-11-23 17:29:04,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 666 transitions. [2021-11-23 17:29:04,632 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 666 transitions. Word has length 81 [2021-11-23 17:29:04,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:04,634 INFO L470 AbstractCegarLoop]: Abstraction has 491 states and 666 transitions. [2021-11-23 17:29:04,635 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.4375) internal successors, (151), 15 states have internal predecessors, (151), 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) [2021-11-23 17:29:04,635 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 666 transitions. [2021-11-23 17:29:04,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 17:29:04,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:04,637 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:04,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:04,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:05,058 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2021-11-23 17:29:05,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:05,239 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:05,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:05,239 INFO L85 PathProgramCache]: Analyzing trace with hash -539544760, now seen corresponding path program 1 times [2021-11-23 17:29:05,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:05,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1456767025] [2021-11-23 17:29:05,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:05,240 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:05,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:05,241 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:05,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:29:05,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:05,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:29:05,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:05,405 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:05,405 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:05,405 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:05,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1456767025] [2021-11-23 17:29:05,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1456767025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:05,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:05,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:29:05,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258124590] [2021-11-23 17:29:05,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:05,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:29:05,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:05,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:29:05,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:05,407 INFO L87 Difference]: Start difference. First operand 491 states and 666 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 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) [2021-11-23 17:29:05,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:05,424 INFO L93 Difference]: Finished difference Result 699 states and 956 transitions. [2021-11-23 17:29:05,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:29:05,429 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 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) Word has length 81 [2021-11-23 17:29:05,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:05,430 INFO L225 Difference]: With dead ends: 699 [2021-11-23 17:29:05,430 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 17:29:05,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:29:05,434 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 24 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:05,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 176 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:29:05,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 17:29:05,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 287. [2021-11-23 17:29:05,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.3041958041958042) internal successors, (373), 286 states have internal predecessors, (373), 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) [2021-11-23 17:29:05,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 373 transitions. [2021-11-23 17:29:05,458 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 373 transitions. Word has length 81 [2021-11-23 17:29:05,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:05,459 INFO L470 AbstractCegarLoop]: Abstraction has 287 states and 373 transitions. [2021-11-23 17:29:05,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 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) [2021-11-23 17:29:05,459 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 373 transitions. [2021-11-23 17:29:05,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 17:29:05,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:05,461 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:05,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:05,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:05,671 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:05,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:05,671 INFO L85 PathProgramCache]: Analyzing trace with hash -1684092460, now seen corresponding path program 1 times [2021-11-23 17:29:05,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:05,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2052787891] [2021-11-23 17:29:05,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:05,672 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:05,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:05,673 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:05,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 17:29:05,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:05,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:05,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:06,732 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:06,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:07,155 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:07,155 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:07,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2052787891] [2021-11-23 17:29:07,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2052787891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:07,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1750212328] [2021-11-23 17:29:07,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:07,156 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:07,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:07,158 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:07,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 17:29:07,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:07,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:07,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:08,185 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:08,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:08,508 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:08,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1750212328] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:08,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523710485] [2021-11-23 17:29:08,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:08,508 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:08,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:08,509 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:08,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 17:29:08,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:08,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:29:08,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:09,455 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:09,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:09,757 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:09,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523710485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:09,757 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:09,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:29:09,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788252723] [2021-11-23 17:29:09,758 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:09,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:29:09,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:09,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:29:09,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:29:09,759 INFO L87 Difference]: Start difference. First operand 287 states and 373 transitions. Second operand has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 states have internal predecessors, (157), 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) [2021-11-23 17:29:09,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:09,865 INFO L93 Difference]: Finished difference Result 505 states and 677 transitions. [2021-11-23 17:29:09,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 17:29:09,866 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 states have internal predecessors, (157), 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) Word has length 82 [2021-11-23 17:29:09,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:09,868 INFO L225 Difference]: With dead ends: 505 [2021-11-23 17:29:09,868 INFO L226 Difference]: Without dead ends: 299 [2021-11-23 17:29:09,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 473 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-11-23 17:29:09,870 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 115 mSDsluCounter, 810 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 891 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 92 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:09,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 891 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 20 Invalid, 0 Unknown, 92 Unchecked, 0.0s Time] [2021-11-23 17:29:09,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-23 17:29:09,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2021-11-23 17:29:09,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.3053691275167785) internal successors, (389), 298 states have internal predecessors, (389), 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) [2021-11-23 17:29:09,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 389 transitions. [2021-11-23 17:29:09,889 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 389 transitions. Word has length 82 [2021-11-23 17:29:09,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:09,889 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 389 transitions. [2021-11-23 17:29:09,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.8125) internal successors, (157), 15 states have internal predecessors, (157), 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) [2021-11-23 17:29:09,890 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 389 transitions. [2021-11-23 17:29:09,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:29:09,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:09,891 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:09,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:10,113 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (29)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:10,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:10,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:10,507 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:10,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:10,507 INFO L85 PathProgramCache]: Analyzing trace with hash -947709751, now seen corresponding path program 1 times [2021-11-23 17:29:10,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:10,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2100351250] [2021-11-23 17:29:10,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:10,508 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:10,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:10,509 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:10,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Waiting until timeout for monitored process [2021-11-23 17:29:10,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:10,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:29:10,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:11,179 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:29:11,179 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:11,179 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:11,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2100351250] [2021-11-23 17:29:11,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2100351250] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:11,180 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:11,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:29:11,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181400969] [2021-11-23 17:29:11,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:11,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:29:11,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:11,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:29:11,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:11,181 INFO L87 Difference]: Start difference. First operand 299 states and 389 transitions. Second operand has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) [2021-11-23 17:29:11,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:11,324 INFO L93 Difference]: Finished difference Result 663 states and 889 transitions. [2021-11-23 17:29:11,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:29:11,325 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) Word has length 83 [2021-11-23 17:29:11,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:11,328 INFO L225 Difference]: With dead ends: 663 [2021-11-23 17:29:11,329 INFO L226 Difference]: Without dead ends: 593 [2021-11-23 17:29:11,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:11,336 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 439 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:11,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [439 Valid, 448 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:29:11,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-11-23 17:29:11,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 445. [2021-11-23 17:29:11,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 444 states have (on average 1.313063063063063) internal successors, (583), 444 states have internal predecessors, (583), 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) [2021-11-23 17:29:11,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 583 transitions. [2021-11-23 17:29:11,372 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 583 transitions. Word has length 83 [2021-11-23 17:29:11,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:11,372 INFO L470 AbstractCegarLoop]: Abstraction has 445 states and 583 transitions. [2021-11-23 17:29:11,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.666666666666666) internal successors, (82), 6 states have internal predecessors, (82), 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) [2021-11-23 17:29:11,373 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 583 transitions. [2021-11-23 17:29:11,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:29:11,374 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:11,374 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:11,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:11,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:11,585 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:11,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:11,586 INFO L85 PathProgramCache]: Analyzing trace with hash -734252954, now seen corresponding path program 1 times [2021-11-23 17:29:11,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:11,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [187715285] [2021-11-23 17:29:11,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:11,586 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:11,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:11,587 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:11,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 17:29:11,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:11,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:29:11,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:12,214 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:29:12,214 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:12,214 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:12,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [187715285] [2021-11-23 17:29:12,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [187715285] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:12,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:12,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:29:12,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535357026] [2021-11-23 17:29:12,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:12,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:29:12,215 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:12,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:29:12,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:12,215 INFO L87 Difference]: Start difference. First operand 445 states and 583 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 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) [2021-11-23 17:29:12,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:12,336 INFO L93 Difference]: Finished difference Result 741 states and 992 transitions. [2021-11-23 17:29:12,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:29:12,337 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 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) Word has length 83 [2021-11-23 17:29:12,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:12,342 INFO L225 Difference]: With dead ends: 741 [2021-11-23 17:29:12,343 INFO L226 Difference]: Without dead ends: 535 [2021-11-23 17:29:12,343 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:12,349 INFO L933 BasicCegarLoop]: 174 mSDtfsCounter, 442 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 442 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:12,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [442 Valid, 470 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:29:12,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-11-23 17:29:12,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 377. [2021-11-23 17:29:12,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 376 states have (on average 1.2925531914893618) internal successors, (486), 376 states have internal predecessors, (486), 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) [2021-11-23 17:29:12,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 486 transitions. [2021-11-23 17:29:12,382 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 486 transitions. Word has length 83 [2021-11-23 17:29:12,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:12,383 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 486 transitions. [2021-11-23 17:29:12,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 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) [2021-11-23 17:29:12,383 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 486 transitions. [2021-11-23 17:29:12,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:29:12,384 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:12,384 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:12,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:12,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:12,595 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:12,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:12,596 INFO L85 PathProgramCache]: Analyzing trace with hash 768106153, now seen corresponding path program 1 times [2021-11-23 17:29:12,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:12,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2016838731] [2021-11-23 17:29:12,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:12,596 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:12,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:12,597 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:12,598 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:29:12,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:12,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:29:12,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:13,329 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:29:13,330 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:13,330 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:13,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2016838731] [2021-11-23 17:29:13,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2016838731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:13,330 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:13,330 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:29:13,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517075095] [2021-11-23 17:29:13,330 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:13,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:29:13,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:13,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:29:13,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:13,332 INFO L87 Difference]: Start difference. First operand 377 states and 486 transitions. Second operand has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 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) [2021-11-23 17:29:13,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:13,439 INFO L93 Difference]: Finished difference Result 673 states and 895 transitions. [2021-11-23 17:29:13,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:29:13,440 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 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) Word has length 83 [2021-11-23 17:29:13,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:13,442 INFO L225 Difference]: With dead ends: 673 [2021-11-23 17:29:13,443 INFO L226 Difference]: Without dead ends: 603 [2021-11-23 17:29:13,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:13,444 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 290 mSDsluCounter, 399 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 580 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:13,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 580 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:29:13,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2021-11-23 17:29:13,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 449. [2021-11-23 17:29:13,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 1.296875) internal successors, (581), 448 states have internal predecessors, (581), 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) [2021-11-23 17:29:13,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 581 transitions. [2021-11-23 17:29:13,475 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 581 transitions. Word has length 83 [2021-11-23 17:29:13,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:13,476 INFO L470 AbstractCegarLoop]: Abstraction has 449 states and 581 transitions. [2021-11-23 17:29:13,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.333333333333334) internal successors, (80), 6 states have internal predecessors, (80), 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) [2021-11-23 17:29:13,476 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 581 transitions. [2021-11-23 17:29:13,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-23 17:29:13,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:13,477 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:13,488 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Ended with exit code 0 [2021-11-23 17:29:13,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:13,688 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:13,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:13,689 INFO L85 PathProgramCache]: Analyzing trace with hash -587357626, now seen corresponding path program 1 times [2021-11-23 17:29:13,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:13,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1180937477] [2021-11-23 17:29:13,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:13,690 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:13,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:13,691 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:13,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 17:29:13,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:13,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:29:13,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:14,280 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:29:14,280 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:29:14,280 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:14,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1180937477] [2021-11-23 17:29:14,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1180937477] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:29:14,281 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:29:14,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 17:29:14,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298935109] [2021-11-23 17:29:14,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:29:14,281 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:29:14,281 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:14,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:29:14,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:14,282 INFO L87 Difference]: Start difference. First operand 449 states and 581 transitions. Second operand has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 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) [2021-11-23 17:29:14,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:14,419 INFO L93 Difference]: Finished difference Result 745 states and 990 transitions. [2021-11-23 17:29:14,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:29:14,420 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 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) Word has length 83 [2021-11-23 17:29:14,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:14,423 INFO L225 Difference]: With dead ends: 745 [2021-11-23 17:29:14,423 INFO L226 Difference]: Without dead ends: 675 [2021-11-23 17:29:14,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:29:14,424 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 304 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:14,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 543 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:29:14,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-11-23 17:29:14,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 527. [2021-11-23 17:29:14,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 527 states, 526 states have (on average 1.3003802281368821) internal successors, (684), 526 states have internal predecessors, (684), 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) [2021-11-23 17:29:14,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 527 states to 527 states and 684 transitions. [2021-11-23 17:29:14,460 INFO L78 Accepts]: Start accepts. Automaton has 527 states and 684 transitions. Word has length 83 [2021-11-23 17:29:14,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:14,461 INFO L470 AbstractCegarLoop]: Abstraction has 527 states and 684 transitions. [2021-11-23 17:29:14,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.5) internal successors, (81), 6 states have internal predecessors, (81), 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) [2021-11-23 17:29:14,461 INFO L276 IsEmpty]: Start isEmpty. Operand 527 states and 684 transitions. [2021-11-23 17:29:14,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:29:14,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:14,462 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:14,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:14,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:14,673 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:14,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:14,674 INFO L85 PathProgramCache]: Analyzing trace with hash -812578338, now seen corresponding path program 1 times [2021-11-23 17:29:14,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:14,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1160345140] [2021-11-23 17:29:14,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:14,674 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:14,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:14,675 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:14,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 17:29:14,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:14,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:29:14,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:16,651 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:16,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:17,353 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:17,353 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:17,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1160345140] [2021-11-23 17:29:17,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1160345140] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:17,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1888307611] [2021-11-23 17:29:17,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:17,354 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:17,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:17,355 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:17,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 17:29:17,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:17,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:29:17,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:19,116 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:19,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:19,471 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:19,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1888307611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:19,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940791090] [2021-11-23 17:29:19,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:19,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:19,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:19,473 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:19,473 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 17:29:19,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:19,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:29:19,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:24,065 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:24,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:26,554 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:26,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940791090] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:26,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:26,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 17, 14, 25, 24] total 71 [2021-11-23 17:29:26,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170365834] [2021-11-23 17:29:26,555 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:26,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:29:26,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:26,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:29:26,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=4177, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:29:26,559 INFO L87 Difference]: Start difference. First operand 527 states and 684 transitions. Second operand has 71 states, 71 states have (on average 3.8028169014084505) internal successors, (270), 71 states have internal predecessors, (270), 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) [2021-11-23 17:29:27,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:27,970 INFO L93 Difference]: Finished difference Result 878 states and 1124 transitions. [2021-11-23 17:29:27,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 17:29:27,971 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.8028169014084505) internal successors, (270), 71 states have internal predecessors, (270), 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) Word has length 84 [2021-11-23 17:29:27,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:27,974 INFO L225 Difference]: With dead ends: 878 [2021-11-23 17:29:27,974 INFO L226 Difference]: Without dead ends: 714 [2021-11-23 17:29:27,976 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 429 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2071 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=935, Invalid=4615, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:29:27,977 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 244 mSDsluCounter, 1852 mSDsCounter, 0 mSdLazyCounter, 743 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 1957 SdHoareTripleChecker+Invalid, 826 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:27,977 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [244 Valid, 1957 Invalid, 826 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 743 Invalid, 0 Unknown, 52 Unchecked, 0.7s Time] [2021-11-23 17:29:27,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2021-11-23 17:29:28,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 505. [2021-11-23 17:29:28,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 1.2996031746031746) internal successors, (655), 504 states have internal predecessors, (655), 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) [2021-11-23 17:29:28,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 655 transitions. [2021-11-23 17:29:28,002 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 655 transitions. Word has length 84 [2021-11-23 17:29:28,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:28,002 INFO L470 AbstractCegarLoop]: Abstraction has 505 states and 655 transitions. [2021-11-23 17:29:28,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.8028169014084505) internal successors, (270), 71 states have internal predecessors, (270), 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) [2021-11-23 17:29:28,002 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 655 transitions. [2021-11-23 17:29:28,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:29:28,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:28,003 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:28,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:28,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:28,431 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-23 17:29:28,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:28,611 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:28,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:28,611 INFO L85 PathProgramCache]: Analyzing trace with hash 838107134, now seen corresponding path program 1 times [2021-11-23 17:29:28,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:28,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1628166072] [2021-11-23 17:29:28,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:28,612 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:28,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:28,613 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:28,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 17:29:28,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:28,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 17:29:28,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:32,952 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:32,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:35,486 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:35,486 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:35,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1628166072] [2021-11-23 17:29:35,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1628166072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:35,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1317609666] [2021-11-23 17:29:35,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:35,487 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:35,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:35,488 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:35,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 17:29:35,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:35,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:29:35,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:37,485 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:37,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:37,991 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:37,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1317609666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:37,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554079791] [2021-11-23 17:29:37,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:37,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:37,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:37,993 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:37,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 17:29:38,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:38,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:29:38,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:45,336 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:45,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:46,848 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:46,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554079791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:46,849 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:46,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 11, 9, 29, 26] total 86 [2021-11-23 17:29:46,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338363228] [2021-11-23 17:29:46,849 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:46,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2021-11-23 17:29:46,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:46,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-11-23 17:29:46,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=969, Invalid=6341, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 17:29:46,853 INFO L87 Difference]: Start difference. First operand 505 states and 655 transitions. Second operand has 86 states, 86 states have (on average 3.9767441860465116) internal successors, (342), 86 states have internal predecessors, (342), 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) [2021-11-23 17:29:47,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:47,171 INFO L93 Difference]: Finished difference Result 658 states and 862 transitions. [2021-11-23 17:29:47,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 17:29:47,171 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 3.9767441860465116) internal successors, (342), 86 states have internal predecessors, (342), 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) Word has length 84 [2021-11-23 17:29:47,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:47,173 INFO L225 Difference]: With dead ends: 658 [2021-11-23 17:29:47,173 INFO L226 Difference]: Without dead ends: 516 [2021-11-23 17:29:47,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 414 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3292 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=1010, Invalid=6472, Unknown=0, NotChecked=0, Total=7482 [2021-11-23 17:29:47,176 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 282 mSDsluCounter, 1479 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 1551 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 183 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:47,177 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 1551 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 156 Invalid, 0 Unknown, 183 Unchecked, 0.2s Time] [2021-11-23 17:29:47,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2021-11-23 17:29:47,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 516. [2021-11-23 17:29:47,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 515 states have (on average 1.2970873786407766) internal successors, (668), 515 states have internal predecessors, (668), 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) [2021-11-23 17:29:47,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 668 transitions. [2021-11-23 17:29:47,204 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 668 transitions. Word has length 84 [2021-11-23 17:29:47,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:47,204 INFO L470 AbstractCegarLoop]: Abstraction has 516 states and 668 transitions. [2021-11-23 17:29:47,205 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 86 states have (on average 3.9767441860465116) internal successors, (342), 86 states have internal predecessors, (342), 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) [2021-11-23 17:29:47,205 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 668 transitions. [2021-11-23 17:29:47,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-23 17:29:47,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:47,205 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:29:47,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:47,415 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 17:29:47,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:47,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:47,809 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:47,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:47,810 INFO L85 PathProgramCache]: Analyzing trace with hash 1768402945, now seen corresponding path program 1 times [2021-11-23 17:29:47,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:47,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [802799569] [2021-11-23 17:29:47,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:47,810 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:47,810 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:47,811 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:47,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 17:29:47,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:47,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:29:47,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:49,054 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:49,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:49,352 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:49,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:49,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [802799569] [2021-11-23 17:29:49,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [802799569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:49,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [228453113] [2021-11-23 17:29:49,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:49,353 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:49,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:49,353 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:49,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 17:29:49,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:49,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:29:49,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:56,310 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:56,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:00,554 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:00,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [228453113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:00,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109839360] [2021-11-23 17:30:00,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:00,554 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:00,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:00,555 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:00,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 17:30:00,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:00,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:30:00,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:07,341 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:07,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:08,239 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:08,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109839360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:08,240 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:08,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 29, 24, 28, 24] total 83 [2021-11-23 17:30:08,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204900510] [2021-11-23 17:30:08,240 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:08,241 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-23 17:30:08,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:08,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-23 17:30:08,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=6125, Unknown=0, NotChecked=0, Total=6806 [2021-11-23 17:30:08,244 INFO L87 Difference]: Start difference. First operand 516 states and 668 transitions. Second operand has 83 states, 83 states have (on average 4.168674698795181) internal successors, (346), 83 states have internal predecessors, (346), 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) [2021-11-23 17:30:12,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:12,280 INFO L93 Difference]: Finished difference Result 863 states and 1107 transitions. [2021-11-23 17:30:12,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:30:12,281 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 4.168674698795181) internal successors, (346), 83 states have internal predecessors, (346), 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) Word has length 84 [2021-11-23 17:30:12,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:12,284 INFO L225 Difference]: With dead ends: 863 [2021-11-23 17:30:12,284 INFO L226 Difference]: Without dead ends: 711 [2021-11-23 17:30:12,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 522 GetRequests, 423 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2986 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=1028, Invalid=8872, Unknown=0, NotChecked=0, Total=9900 [2021-11-23 17:30:12,287 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 248 mSDsluCounter, 2660 mSDsCounter, 0 mSdLazyCounter, 572 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 2762 SdHoareTripleChecker+Invalid, 920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 329 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:12,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [248 Valid, 2762 Invalid, 920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 572 Invalid, 0 Unknown, 329 Unchecked, 0.5s Time] [2021-11-23 17:30:12,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 711 states. [2021-11-23 17:30:12,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 711 to 517. [2021-11-23 17:30:12,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 516 states have (on average 1.2965116279069768) internal successors, (669), 516 states have internal predecessors, (669), 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) [2021-11-23 17:30:12,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 669 transitions. [2021-11-23 17:30:12,338 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 669 transitions. Word has length 84 [2021-11-23 17:30:12,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:12,339 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 669 transitions. [2021-11-23 17:30:12,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 4.168674698795181) internal successors, (346), 83 states have internal predecessors, (346), 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) [2021-11-23 17:30:12,339 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 669 transitions. [2021-11-23 17:30:12,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:30:12,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:12,340 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:12,366 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Ended with exit code 0 [2021-11-23 17:30:12,571 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-23 17:30:12,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:12,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:12,952 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:12,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:12,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1449431160, now seen corresponding path program 1 times [2021-11-23 17:30:12,952 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:12,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [38494285] [2021-11-23 17:30:12,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:12,953 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:12,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:12,953 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:12,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 17:30:13,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:13,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:30:13,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:15,160 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:15,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:15,950 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:15,951 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:15,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [38494285] [2021-11-23 17:30:15,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [38494285] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:15,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [174750715] [2021-11-23 17:30:15,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:15,951 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:15,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:15,952 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:15,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 17:30:16,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:16,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 17:30:16,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:18,711 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:18,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:19,861 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:19,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [174750715] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:19,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770084401] [2021-11-23 17:30:19,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:19,862 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:19,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:19,870 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:19,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 17:30:19,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:19,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:30:19,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:22,517 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:22,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:24,171 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:24,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770084401] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:24,172 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:24,172 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 17, 13, 17, 16] total 74 [2021-11-23 17:30:24,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105809790] [2021-11-23 17:30:24,173 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:24,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2021-11-23 17:30:24,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:24,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-11-23 17:30:24,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=584, Invalid=4818, Unknown=0, NotChecked=0, Total=5402 [2021-11-23 17:30:24,176 INFO L87 Difference]: Start difference. First operand 517 states and 669 transitions. Second operand has 74 states, 74 states have (on average 5.27027027027027) internal successors, (390), 74 states have internal predecessors, (390), 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) [2021-11-23 17:30:25,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:25,542 INFO L93 Difference]: Finished difference Result 835 states and 1078 transitions. [2021-11-23 17:30:25,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:30:25,543 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 5.27027027027027) internal successors, (390), 74 states have internal predecessors, (390), 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) Word has length 85 [2021-11-23 17:30:25,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:25,546 INFO L225 Difference]: With dead ends: 835 [2021-11-23 17:30:25,546 INFO L226 Difference]: Without dead ends: 693 [2021-11-23 17:30:25,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 531 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2531 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=932, Invalid=7258, Unknown=0, NotChecked=0, Total=8190 [2021-11-23 17:30:25,549 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 210 mSDsluCounter, 3533 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 3638 SdHoareTripleChecker+Invalid, 498 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 331 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:25,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 3638 Invalid, 498 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 160 Invalid, 0 Unknown, 331 Unchecked, 0.1s Time] [2021-11-23 17:30:25,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-11-23 17:30:25,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 517. [2021-11-23 17:30:25,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 516 states have (on average 1.2965116279069768) internal successors, (669), 516 states have internal predecessors, (669), 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) [2021-11-23 17:30:25,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 669 transitions. [2021-11-23 17:30:25,577 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 669 transitions. Word has length 85 [2021-11-23 17:30:25,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:25,577 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 669 transitions. [2021-11-23 17:30:25,577 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 5.27027027027027) internal successors, (390), 74 states have internal predecessors, (390), 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) [2021-11-23 17:30:25,577 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 669 transitions. [2021-11-23 17:30:25,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:30:25,578 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:25,579 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:25,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:25,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-23 17:30:25,999 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-23 17:30:26,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:26,198 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:26,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:26,199 INFO L85 PathProgramCache]: Analyzing trace with hash -519135349, now seen corresponding path program 1 times [2021-11-23 17:30:26,199 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:26,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [298738414] [2021-11-23 17:30:26,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:26,199 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:26,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:26,200 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:26,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:30:26,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:26,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:30:26,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:27,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:27,645 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:27,645 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:27,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [298738414] [2021-11-23 17:30:27,645 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [298738414] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:27,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [271983501] [2021-11-23 17:30:27,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:27,646 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:27,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:27,646 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:27,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 17:30:27,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:27,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:30:27,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:29,119 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:29,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:29,511 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:29,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [271983501] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:29,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228585869] [2021-11-23 17:30:29,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:29,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:29,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:29,514 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:29,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 17:30:29,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:29,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:30:29,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:30,972 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:30,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:31,800 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:31,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228585869] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:31,801 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:31,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 45 [2021-11-23 17:30:31,801 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840633427] [2021-11-23 17:30:31,801 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:31,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 17:30:31,802 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:31,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 17:30:31,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1818, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 17:30:31,804 INFO L87 Difference]: Start difference. First operand 517 states and 669 transitions. Second operand has 45 states, 45 states have (on average 8.911111111111111) internal successors, (401), 45 states have internal predecessors, (401), 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) [2021-11-23 17:30:32,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:32,565 INFO L93 Difference]: Finished difference Result 819 states and 1060 transitions. [2021-11-23 17:30:32,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:30:32,566 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 8.911111111111111) internal successors, (401), 45 states have internal predecessors, (401), 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) Word has length 85 [2021-11-23 17:30:32,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:32,569 INFO L225 Difference]: With dead ends: 819 [2021-11-23 17:30:32,569 INFO L226 Difference]: Without dead ends: 667 [2021-11-23 17:30:32,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 464 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=327, Invalid=2979, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:30:32,570 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 140 mSDsluCounter, 2502 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 2610 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 244 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:32,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 2610 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 144 Invalid, 0 Unknown, 244 Unchecked, 0.1s Time] [2021-11-23 17:30:32,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2021-11-23 17:30:32,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 497. [2021-11-23 17:30:32,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 1.3004032258064515) internal successors, (645), 496 states have internal predecessors, (645), 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) [2021-11-23 17:30:32,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 645 transitions. [2021-11-23 17:30:32,621 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 645 transitions. Word has length 85 [2021-11-23 17:30:32,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:32,621 INFO L470 AbstractCegarLoop]: Abstraction has 497 states and 645 transitions. [2021-11-23 17:30:32,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 8.911111111111111) internal successors, (401), 45 states have internal predecessors, (401), 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) [2021-11-23 17:30:32,621 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 645 transitions. [2021-11-23 17:30:32,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:30:32,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:32,622 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:32,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:32,847 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2021-11-23 17:30:33,032 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:33,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:33,225 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:33,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:33,225 INFO L85 PathProgramCache]: Analyzing trace with hash -1032066507, now seen corresponding path program 1 times [2021-11-23 17:30:33,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:33,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [267036868] [2021-11-23 17:30:33,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:33,225 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:33,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:33,226 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:33,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 17:30:33,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:33,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:30:33,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:33,482 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:33,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:33,642 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:33,642 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:33,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [267036868] [2021-11-23 17:30:33,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [267036868] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:33,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1344943917] [2021-11-23 17:30:33,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:33,643 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:33,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:33,644 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:33,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 17:30:33,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:33,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:30:33,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:33,954 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:33,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:34,142 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:34,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1344943917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:34,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525891997] [2021-11-23 17:30:34,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:34,143 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:34,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:34,144 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:34,147 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 17:30:34,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:34,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:30:34,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:34,422 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:30:34,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:34,675 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:34,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525891997] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:34,675 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:34,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 5] total 7 [2021-11-23 17:30:34,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740352910] [2021-11-23 17:30:34,676 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:34,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 17:30:34,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:34,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 17:30:34,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:30:34,677 INFO L87 Difference]: Start difference. First operand 497 states and 645 transitions. Second operand has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 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) [2021-11-23 17:30:34,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:34,780 INFO L93 Difference]: Finished difference Result 1672 states and 2193 transitions. [2021-11-23 17:30:34,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 17:30:34,781 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 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) Word has length 85 [2021-11-23 17:30:34,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:34,786 INFO L225 Difference]: With dead ends: 1672 [2021-11-23 17:30:34,786 INFO L226 Difference]: Without dead ends: 1262 [2021-11-23 17:30:34,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 496 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2021-11-23 17:30:34,787 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 262 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 561 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:34,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 561 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 34 Invalid, 0 Unknown, 28 Unchecked, 0.0s Time] [2021-11-23 17:30:34,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1262 states. [2021-11-23 17:30:34,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1262 to 1167. [2021-11-23 17:30:34,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1167 states, 1166 states have (on average 1.2907375643224699) internal successors, (1505), 1166 states have internal predecessors, (1505), 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) [2021-11-23 17:30:34,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1167 states to 1167 states and 1505 transitions. [2021-11-23 17:30:34,891 INFO L78 Accepts]: Start accepts. Automaton has 1167 states and 1505 transitions. Word has length 85 [2021-11-23 17:30:34,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:34,893 INFO L470 AbstractCegarLoop]: Abstraction has 1167 states and 1505 transitions. [2021-11-23 17:30:34,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 30.0) internal successors, (210), 7 states have internal predecessors, (210), 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) [2021-11-23 17:30:34,894 INFO L276 IsEmpty]: Start isEmpty. Operand 1167 states and 1505 transitions. [2021-11-23 17:30:34,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:30:34,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:34,895 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:30:34,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:35,117 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 17:30:35,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Ended with exit code 0 [2021-11-23 17:30:35,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:35,511 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:35,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:35,511 INFO L85 PathProgramCache]: Analyzing trace with hash 1703310430, now seen corresponding path program 1 times [2021-11-23 17:30:35,512 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:35,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1303408299] [2021-11-23 17:30:35,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:35,512 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:35,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:35,514 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:35,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 17:30:35,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:35,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:30:35,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:44,694 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:44,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:51,084 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:51,084 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:51,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1303408299] [2021-11-23 17:30:51,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1303408299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:51,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1644803016] [2021-11-23 17:30:51,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:51,086 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:51,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:51,087 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:51,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 17:30:51,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:51,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:30:51,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:01,469 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:01,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:03,800 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:03,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1644803016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:03,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646408640] [2021-11-23 17:31:03,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:03,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:03,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:03,801 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:03,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 17:31:03,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:03,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:31:03,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:07,167 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:07,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:08,123 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:08,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646408640] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:08,123 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:08,123 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 22, 29, 24, 29, 24] total 68 [2021-11-23 17:31:08,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712491836] [2021-11-23 17:31:08,124 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:08,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 17:31:08,125 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:08,125 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 17:31:08,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=4035, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:31:08,126 INFO L87 Difference]: Start difference. First operand 1167 states and 1505 transitions. Second operand has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 68 states have internal predecessors, (217), 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) [2021-11-23 17:31:09,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:09,293 INFO L93 Difference]: Finished difference Result 1579 states and 2035 transitions. [2021-11-23 17:31:09,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:31:09,294 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 68 states have internal predecessors, (217), 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) Word has length 85 [2021-11-23 17:31:09,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:09,300 INFO L225 Difference]: With dead ends: 1579 [2021-11-23 17:31:09,300 INFO L226 Difference]: Without dead ends: 1219 [2021-11-23 17:31:09,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 436 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=562, Invalid=4268, Unknown=0, NotChecked=0, Total=4830 [2021-11-23 17:31:09,302 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 268 mSDsluCounter, 1437 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 669 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 279 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:09,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 1506 Invalid, 669 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 376 Invalid, 0 Unknown, 279 Unchecked, 0.5s Time] [2021-11-23 17:31:09,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1219 states. [2021-11-23 17:31:09,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1219 to 1183. [2021-11-23 17:31:09,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1183 states, 1182 states have (on average 1.2893401015228427) internal successors, (1524), 1182 states have internal predecessors, (1524), 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) [2021-11-23 17:31:09,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1183 states to 1183 states and 1524 transitions. [2021-11-23 17:31:09,385 INFO L78 Accepts]: Start accepts. Automaton has 1183 states and 1524 transitions. Word has length 85 [2021-11-23 17:31:09,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:09,385 INFO L470 AbstractCegarLoop]: Abstraction has 1183 states and 1524 transitions. [2021-11-23 17:31:09,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 3.1911764705882355) internal successors, (217), 68 states have internal predecessors, (217), 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) [2021-11-23 17:31:09,386 INFO L276 IsEmpty]: Start isEmpty. Operand 1183 states and 1524 transitions. [2021-11-23 17:31:09,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 17:31:09,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:09,387 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:09,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:09,599 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Ended with exit code 0 [2021-11-23 17:31:09,818 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 17:31:09,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:09,998 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:09,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:09,998 INFO L85 PathProgramCache]: Analyzing trace with hash 293380225, now seen corresponding path program 1 times [2021-11-23 17:31:09,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:09,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1524892952] [2021-11-23 17:31:09,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:09,999 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:09,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:10,000 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:10,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 17:31:10,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:10,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:31:10,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:12,237 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:12,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:13,083 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:13,083 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:13,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1524892952] [2021-11-23 17:31:13,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1524892952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:13,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1822959820] [2021-11-23 17:31:13,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:13,084 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:13,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:13,086 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:13,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 17:31:13,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:13,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:31:13,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:14,677 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:14,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:15,030 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:15,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1822959820] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:15,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191230639] [2021-11-23 17:31:15,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:15,031 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:15,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:15,032 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:15,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 17:31:15,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:15,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:31:15,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:19,929 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:19,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:21,855 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:21,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191230639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:21,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:21,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 11, 9, 23, 21] total 79 [2021-11-23 17:31:21,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427468185] [2021-11-23 17:31:21,856 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:21,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-23 17:31:21,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:21,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-23 17:31:21,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=819, Invalid=5343, Unknown=0, NotChecked=0, Total=6162 [2021-11-23 17:31:21,859 INFO L87 Difference]: Start difference. First operand 1183 states and 1524 transitions. Second operand has 79 states, 79 states have (on average 5.037974683544304) internal successors, (398), 79 states have internal predecessors, (398), 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) [2021-11-23 17:31:23,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:23,435 INFO L93 Difference]: Finished difference Result 1652 states and 2143 transitions. [2021-11-23 17:31:23,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:31:23,435 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 5.037974683544304) internal successors, (398), 79 states have internal predecessors, (398), 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) Word has length 85 [2021-11-23 17:31:23,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:23,439 INFO L225 Difference]: With dead ends: 1652 [2021-11-23 17:31:23,439 INFO L226 Difference]: Without dead ends: 1227 [2021-11-23 17:31:23,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3271 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1114, Invalid=7442, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 17:31:23,442 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 268 mSDsluCounter, 1801 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 268 SdHoareTripleChecker+Valid, 1881 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 153 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:23,442 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [268 Valid, 1881 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 332 Invalid, 0 Unknown, 153 Unchecked, 0.3s Time] [2021-11-23 17:31:23,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1227 states. [2021-11-23 17:31:23,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1227 to 1184. [2021-11-23 17:31:23,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1184 states, 1183 states have (on average 1.2890955198647507) internal successors, (1525), 1183 states have internal predecessors, (1525), 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) [2021-11-23 17:31:23,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1184 states to 1184 states and 1525 transitions. [2021-11-23 17:31:23,518 INFO L78 Accepts]: Start accepts. Automaton has 1184 states and 1525 transitions. Word has length 85 [2021-11-23 17:31:23,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:23,518 INFO L470 AbstractCegarLoop]: Abstraction has 1184 states and 1525 transitions. [2021-11-23 17:31:23,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 5.037974683544304) internal successors, (398), 79 states have internal predecessors, (398), 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) [2021-11-23 17:31:23,519 INFO L276 IsEmpty]: Start isEmpty. Operand 1184 states and 1525 transitions. [2021-11-23 17:31:23,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:31:23,519 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:23,519 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:23,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:23,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:23,942 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:24,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:24,120 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:24,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:24,121 INFO L85 PathProgramCache]: Analyzing trace with hash -490899948, now seen corresponding path program 1 times [2021-11-23 17:31:24,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:24,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [111121732] [2021-11-23 17:31:24,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:24,121 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:24,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:24,122 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:24,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 17:31:24,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:24,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:31:24,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:25,370 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:25,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:25,671 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:25,671 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:25,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [111121732] [2021-11-23 17:31:25,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [111121732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:25,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [995249722] [2021-11-23 17:31:25,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:25,672 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:25,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:25,681 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:25,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 17:31:25,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:25,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:31:25,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:26,910 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:26,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:27,108 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:27,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [995249722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:27,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883840992] [2021-11-23 17:31:27,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:27,108 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:27,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:27,109 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:27,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 17:31:27,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:27,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 17:31:27,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:28,394 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:28,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:29,010 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:29,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883840992] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:29,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:29,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 12, 10] total 30 [2021-11-23 17:31:29,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489862878] [2021-11-23 17:31:29,011 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:29,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 17:31:29,011 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:29,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 17:31:29,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2021-11-23 17:31:29,012 INFO L87 Difference]: Start difference. First operand 1184 states and 1525 transitions. Second operand has 30 states, 30 states have (on average 8.8) internal successors, (264), 30 states have internal predecessors, (264), 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) [2021-11-23 17:31:29,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:29,148 INFO L93 Difference]: Finished difference Result 1550 states and 2007 transitions. [2021-11-23 17:31:29,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:31:29,149 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 8.8) internal successors, (264), 30 states have internal predecessors, (264), 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) Word has length 86 [2021-11-23 17:31:29,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:29,151 INFO L225 Difference]: With dead ends: 1550 [2021-11-23 17:31:29,151 INFO L226 Difference]: Without dead ends: 1190 [2021-11-23 17:31:29,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 511 GetRequests, 481 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=135, Invalid=795, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:31:29,152 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 180 mSDsluCounter, 868 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 956 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 88 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:29,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 956 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 81 Invalid, 0 Unknown, 88 Unchecked, 0.1s Time] [2021-11-23 17:31:29,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1190 states. [2021-11-23 17:31:29,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1190 to 1179. [2021-11-23 17:31:29,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1179 states, 1178 states have (on average 1.2894736842105263) internal successors, (1519), 1178 states have internal predecessors, (1519), 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) [2021-11-23 17:31:29,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1179 states to 1179 states and 1519 transitions. [2021-11-23 17:31:29,215 INFO L78 Accepts]: Start accepts. Automaton has 1179 states and 1519 transitions. Word has length 86 [2021-11-23 17:31:29,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:29,215 INFO L470 AbstractCegarLoop]: Abstraction has 1179 states and 1519 transitions. [2021-11-23 17:31:29,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 8.8) internal successors, (264), 30 states have internal predecessors, (264), 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) [2021-11-23 17:31:29,215 INFO L276 IsEmpty]: Start isEmpty. Operand 1179 states and 1519 transitions. [2021-11-23 17:31:29,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:31:29,216 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:29,216 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:29,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:29,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:29,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:29,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:29,817 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:29,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:29,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1900830153, now seen corresponding path program 1 times [2021-11-23 17:31:29,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:29,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [809534861] [2021-11-23 17:31:29,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:29,818 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:29,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:29,819 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:29,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 17:31:29,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:29,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:31:29,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:30,980 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:30,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:31,270 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:31,270 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:31,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [809534861] [2021-11-23 17:31:31,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [809534861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:31,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [491601613] [2021-11-23 17:31:31,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:31,271 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:31,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:31,272 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:31,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 17:31:31,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:31,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:31:31,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:32,665 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:32,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:32,882 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:32,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [491601613] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:32,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820970247] [2021-11-23 17:31:32,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:32,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:32,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:32,884 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:32,885 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 17:31:32,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:32,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:31:32,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:40,980 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:40,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:44,523 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:44,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820970247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:44,524 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:44,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 31, 26] total 71 [2021-11-23 17:31:44,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122049911] [2021-11-23 17:31:44,524 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:44,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 17:31:44,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:44,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 17:31:44,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=4410, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 17:31:44,526 INFO L87 Difference]: Start difference. First operand 1179 states and 1519 transitions. Second operand has 71 states, 71 states have (on average 4.211267605633803) internal successors, (299), 71 states have internal predecessors, (299), 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) [2021-11-23 17:31:51,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:51,752 INFO L93 Difference]: Finished difference Result 2606 states and 3347 transitions. [2021-11-23 17:31:51,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 17:31:51,752 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 4.211267605633803) internal successors, (299), 71 states have internal predecessors, (299), 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) Word has length 86 [2021-11-23 17:31:51,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:51,755 INFO L225 Difference]: With dead ends: 2606 [2021-11-23 17:31:51,755 INFO L226 Difference]: Without dead ends: 1523 [2021-11-23 17:31:51,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 450 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2226 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=893, Invalid=7117, Unknown=0, NotChecked=0, Total=8010 [2021-11-23 17:31:51,758 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 260 mSDsluCounter, 2366 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 2475 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 380 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:51,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 2475 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 574 Invalid, 0 Unknown, 380 Unchecked, 0.6s Time] [2021-11-23 17:31:51,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1523 states. [2021-11-23 17:31:51,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1523 to 1089. [2021-11-23 17:31:51,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1089 states, 1088 states have (on average 1.2858455882352942) internal successors, (1399), 1088 states have internal predecessors, (1399), 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) [2021-11-23 17:31:51,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1089 states to 1089 states and 1399 transitions. [2021-11-23 17:31:51,830 INFO L78 Accepts]: Start accepts. Automaton has 1089 states and 1399 transitions. Word has length 86 [2021-11-23 17:31:51,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:51,830 INFO L470 AbstractCegarLoop]: Abstraction has 1089 states and 1399 transitions. [2021-11-23 17:31:51,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 4.211267605633803) internal successors, (299), 71 states have internal predecessors, (299), 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) [2021-11-23 17:31:51,830 INFO L276 IsEmpty]: Start isEmpty. Operand 1089 states and 1399 transitions. [2021-11-23 17:31:51,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:31:51,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:51,831 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:51,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-23 17:31:52,037 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Ended with exit code 0 [2021-11-23 17:31:52,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:52,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:52,435 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:52,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:52,435 INFO L85 PathProgramCache]: Analyzing trace with hash 375679120, now seen corresponding path program 1 times [2021-11-23 17:31:52,435 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:52,435 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1751880382] [2021-11-23 17:31:52,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:52,436 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:52,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:52,436 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:52,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 17:31:52,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:52,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:31:52,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:52,698 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:31:52,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:52,855 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:31:52,855 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:52,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1751880382] [2021-11-23 17:31:52,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1751880382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:52,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1380074964] [2021-11-23 17:31:52,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:52,855 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:52,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:52,856 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:52,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 17:31:52,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:52,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:31:52,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:53,030 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:31:53,030 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:31:53,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1380074964] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:31:53,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:31:53,031 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:31:53,031 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578855028] [2021-11-23 17:31:53,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:31:53,031 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:31:53,031 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:53,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:31:53,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:53,032 INFO L87 Difference]: Start difference. First operand 1089 states and 1399 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-11-23 17:31:53,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:53,139 INFO L93 Difference]: Finished difference Result 2072 states and 2680 transitions. [2021-11-23 17:31:53,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:31:53,139 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) Word has length 86 [2021-11-23 17:31:53,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:53,142 INFO L225 Difference]: With dead ends: 2072 [2021-11-23 17:31:53,142 INFO L226 Difference]: Without dead ends: 1119 [2021-11-23 17:31:53,143 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 250 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:31:53,144 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 59 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:53,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 161 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:31:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1119 states. [2021-11-23 17:31:53,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1119 to 1090. [2021-11-23 17:31:53,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1090 states, 1089 states have (on average 1.2727272727272727) internal successors, (1386), 1089 states have internal predecessors, (1386), 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) [2021-11-23 17:31:53,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1090 states to 1090 states and 1386 transitions. [2021-11-23 17:31:53,224 INFO L78 Accepts]: Start accepts. Automaton has 1090 states and 1386 transitions. Word has length 86 [2021-11-23 17:31:53,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:53,225 INFO L470 AbstractCegarLoop]: Abstraction has 1090 states and 1386 transitions. [2021-11-23 17:31:53,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 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) [2021-11-23 17:31:53,225 INFO L276 IsEmpty]: Start isEmpty. Operand 1090 states and 1386 transitions. [2021-11-23 17:31:53,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:31:53,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:53,226 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:31:53,242 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:53,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:53,637 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:53,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:53,637 INFO L85 PathProgramCache]: Analyzing trace with hash -108201548, now seen corresponding path program 1 times [2021-11-23 17:31:53,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:53,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [725839559] [2021-11-23 17:31:53,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:53,638 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:53,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:53,639 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:53,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:31:53,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:53,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:31:53,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:54,955 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:54,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:55,244 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:55,244 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:55,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [725839559] [2021-11-23 17:31:55,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [725839559] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:55,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [498393646] [2021-11-23 17:31:55,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:55,244 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:55,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:55,245 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:55,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 17:31:55,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:55,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:31:55,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:56,411 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:56,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:56,594 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:56,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [498393646] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:56,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556757220] [2021-11-23 17:31:56,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:56,594 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:56,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:56,595 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:56,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 17:31:56,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:56,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:31:56,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:59,822 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:59,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:00,871 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:00,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556757220] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:00,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:00,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 18, 16] total 46 [2021-11-23 17:32:00,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176467420] [2021-11-23 17:32:00,872 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:00,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 17:32:00,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:00,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 17:32:00,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1804, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 17:32:00,874 INFO L87 Difference]: Start difference. First operand 1090 states and 1386 transitions. Second operand has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 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) [2021-11-23 17:32:01,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:01,236 INFO L93 Difference]: Finished difference Result 1542 states and 1979 transitions. [2021-11-23 17:32:01,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:32:01,237 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 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) Word has length 86 [2021-11-23 17:32:01,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:01,238 INFO L225 Difference]: With dead ends: 1542 [2021-11-23 17:32:01,239 INFO L226 Difference]: Without dead ends: 1168 [2021-11-23 17:32:01,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 466 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=315, Invalid=2037, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 17:32:01,240 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 151 mSDsluCounter, 1599 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 1685 SdHoareTripleChecker+Invalid, 285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:01,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 1685 Invalid, 285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 163 Invalid, 0 Unknown, 116 Unchecked, 0.1s Time] [2021-11-23 17:32:01,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1168 states. [2021-11-23 17:32:01,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1168 to 1096. [2021-11-23 17:32:01,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1096 states, 1095 states have (on average 1.272146118721461) internal successors, (1393), 1095 states have internal predecessors, (1393), 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) [2021-11-23 17:32:01,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 1393 transitions. [2021-11-23 17:32:01,306 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 1393 transitions. Word has length 86 [2021-11-23 17:32:01,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:01,306 INFO L470 AbstractCegarLoop]: Abstraction has 1096 states and 1393 transitions. [2021-11-23 17:32:01,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.978260869565218) internal successors, (275), 46 states have internal predecessors, (275), 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) [2021-11-23 17:32:01,306 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 1393 transitions. [2021-11-23 17:32:01,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 17:32:01,307 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:01,307 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:01,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:01,514 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Ended with exit code 0 [2021-11-23 17:32:01,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Ended with exit code 0 [2021-11-23 17:32:01,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:01,908 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:01,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:01,908 INFO L85 PathProgramCache]: Analyzing trace with hash 590753470, now seen corresponding path program 1 times [2021-11-23 17:32:01,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:01,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1199325175] [2021-11-23 17:32:01,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:01,909 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:01,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:01,909 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:01,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:32:01,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:01,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 17:32:01,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:03,728 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:03,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:04,400 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:04,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1199325175] [2021-11-23 17:32:04,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1199325175] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:04,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [486175784] [2021-11-23 17:32:04,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:04,401 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:04,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:04,415 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:04,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:32:04,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:04,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:32:04,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:07,952 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:07,953 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:09,059 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:09,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [486175784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:09,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120879561] [2021-11-23 17:32:09,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:09,059 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:09,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:09,060 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:09,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:32:09,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:09,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:32:09,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:18,519 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:18,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:21,310 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:21,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120879561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:21,310 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:21,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14, 19, 15, 27, 22] total 96 [2021-11-23 17:32:21,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902126595] [2021-11-23 17:32:21,311 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:21,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2021-11-23 17:32:21,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:21,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2021-11-23 17:32:21,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=960, Invalid=8160, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 17:32:21,313 INFO L87 Difference]: Start difference. First operand 1096 states and 1393 transitions. Second operand has 96 states, 96 states have (on average 4.260416666666667) internal successors, (409), 96 states have internal predecessors, (409), 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) [2021-11-23 17:32:21,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:21,757 INFO L93 Difference]: Finished difference Result 1462 states and 1871 transitions. [2021-11-23 17:32:21,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-23 17:32:21,758 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 96 states have (on average 4.260416666666667) internal successors, (409), 96 states have internal predecessors, (409), 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) Word has length 87 [2021-11-23 17:32:21,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:21,759 INFO L225 Difference]: With dead ends: 1462 [2021-11-23 17:32:21,759 INFO L226 Difference]: Without dead ends: 1088 [2021-11-23 17:32:21,761 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 422 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3991 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=998, Invalid=8314, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 17:32:21,761 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 210 mSDsluCounter, 2462 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 2555 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 245 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:21,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 2555 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 293 Invalid, 0 Unknown, 245 Unchecked, 0.3s Time] [2021-11-23 17:32:21,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1088 states. [2021-11-23 17:32:21,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1088 to 1076. [2021-11-23 17:32:21,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1076 states, 1075 states have (on average 1.2734883720930232) internal successors, (1369), 1075 states have internal predecessors, (1369), 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) [2021-11-23 17:32:21,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1076 states to 1076 states and 1369 transitions. [2021-11-23 17:32:21,815 INFO L78 Accepts]: Start accepts. Automaton has 1076 states and 1369 transitions. Word has length 87 [2021-11-23 17:32:21,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:21,816 INFO L470 AbstractCegarLoop]: Abstraction has 1076 states and 1369 transitions. [2021-11-23 17:32:21,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 96 states have (on average 4.260416666666667) internal successors, (409), 96 states have internal predecessors, (409), 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) [2021-11-23 17:32:21,816 INFO L276 IsEmpty]: Start isEmpty. Operand 1076 states and 1369 transitions. [2021-11-23 17:32:21,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:32:21,817 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:21,817 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:32:21,824 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:22,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Ended with exit code 0 [2021-11-23 17:32:22,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:22,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:22,418 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:22,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:22,419 INFO L85 PathProgramCache]: Analyzing trace with hash 695845254, now seen corresponding path program 1 times [2021-11-23 17:32:22,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:22,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1564868801] [2021-11-23 17:32:22,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:22,419 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:22,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:22,420 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:22,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:32:22,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:22,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:22,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:24,234 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:24,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:24,807 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:24,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:24,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1564868801] [2021-11-23 17:32:24,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1564868801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:24,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1531088762] [2021-11-23 17:32:24,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:24,807 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:24,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:24,808 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:24,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Waiting until timeout for monitored process [2021-11-23 17:32:24,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:24,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:24,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:26,414 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:26,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:26,788 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:26,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1531088762] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:26,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552244942] [2021-11-23 17:32:26,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:26,789 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:26,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:26,790 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:26,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-23 17:32:26,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:26,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:26,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:28,163 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:32:28,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:28,925 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:32:28,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [552244942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:28,925 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:28,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:32:28,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410347437] [2021-11-23 17:32:28,926 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:28,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:32:28,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:28,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:32:28,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:32:28,927 INFO L87 Difference]: Start difference. First operand 1076 states and 1369 transitions. Second operand has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 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) [2021-11-23 17:32:29,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:29,390 INFO L93 Difference]: Finished difference Result 2090 states and 2675 transitions. [2021-11-23 17:32:29,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:32:29,391 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 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) Word has length 138 [2021-11-23 17:32:29,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:29,392 INFO L225 Difference]: With dead ends: 2090 [2021-11-23 17:32:29,392 INFO L226 Difference]: Without dead ends: 1116 [2021-11-23 17:32:29,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=257, Invalid=1635, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:32:29,394 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 206 mSDsluCounter, 1778 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 1874 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:29,395 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 1874 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 53 Invalid, 0 Unknown, 124 Unchecked, 0.0s Time] [2021-11-23 17:32:29,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1116 states. [2021-11-23 17:32:29,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1116 to 1116. [2021-11-23 17:32:29,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1116 states, 1115 states have (on average 1.2672645739910313) internal successors, (1413), 1115 states have internal predecessors, (1413), 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) [2021-11-23 17:32:29,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1116 states to 1116 states and 1413 transitions. [2021-11-23 17:32:29,451 INFO L78 Accepts]: Start accepts. Automaton has 1116 states and 1413 transitions. Word has length 138 [2021-11-23 17:32:29,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:29,452 INFO L470 AbstractCegarLoop]: Abstraction has 1116 states and 1413 transitions. [2021-11-23 17:32:29,452 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.470588235294118) internal successors, (424), 33 states have internal predecessors, (424), 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) [2021-11-23 17:32:29,453 INFO L276 IsEmpty]: Start isEmpty. Operand 1116 states and 1413 transitions. [2021-11-23 17:32:29,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:32:29,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:29,454 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 17:32:29,473 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:29,686 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2021-11-23 17:32:29,867 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (75)] Ended with exit code 0 [2021-11-23 17:32:30,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:30,066 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:30,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:30,067 INFO L85 PathProgramCache]: Analyzing trace with hash 716604902, now seen corresponding path program 1 times [2021-11-23 17:32:30,067 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:30,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [960648788] [2021-11-23 17:32:30,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:30,067 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:30,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:30,068 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:30,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Waiting until timeout for monitored process [2021-11-23 17:32:30,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:30,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:30,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:31,928 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:31,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:32,549 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:32,550 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:32,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [960648788] [2021-11-23 17:32:32,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [960648788] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:32,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2070263131] [2021-11-23 17:32:32,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:32,550 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:32,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:32,551 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:32,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Waiting until timeout for monitored process [2021-11-23 17:32:32,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:32,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:32,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:34,194 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:34,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:34,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2070263131] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:34,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1452939429] [2021-11-23 17:32:34,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:34,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:34,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:34,643 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:34,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-23 17:32:34,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:34,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:34,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:36,294 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:36,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:36,904 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 38 proven. 75 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:36,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1452939429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:36,904 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:36,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:32:36,905 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740246199] [2021-11-23 17:32:36,905 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:36,906 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:32:36,906 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:36,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:32:36,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:32:36,907 INFO L87 Difference]: Start difference. First operand 1116 states and 1413 transitions. Second operand has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 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) [2021-11-23 17:32:37,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:37,310 INFO L93 Difference]: Finished difference Result 2196 states and 2796 transitions. [2021-11-23 17:32:37,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 17:32:37,311 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 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) Word has length 138 [2021-11-23 17:32:37,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:37,313 INFO L225 Difference]: With dead ends: 2196 [2021-11-23 17:32:37,313 INFO L226 Difference]: Without dead ends: 1222 [2021-11-23 17:32:37,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 794 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 17:32:37,314 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 144 mSDsluCounter, 1481 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 1581 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 119 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:37,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 1581 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 119 Unchecked, 0.0s Time] [2021-11-23 17:32:37,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1222 states. [2021-11-23 17:32:37,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1222 to 1218. [2021-11-23 17:32:37,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1218 states, 1217 states have (on average 1.2555464256368118) internal successors, (1528), 1217 states have internal predecessors, (1528), 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) [2021-11-23 17:32:37,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1218 states to 1218 states and 1528 transitions. [2021-11-23 17:32:37,388 INFO L78 Accepts]: Start accepts. Automaton has 1218 states and 1528 transitions. Word has length 138 [2021-11-23 17:32:37,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:37,388 INFO L470 AbstractCegarLoop]: Abstraction has 1218 states and 1528 transitions. [2021-11-23 17:32:37,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 12.794117647058824) internal successors, (435), 33 states have internal predecessors, (435), 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) [2021-11-23 17:32:37,388 INFO L276 IsEmpty]: Start isEmpty. Operand 1218 states and 1528 transitions. [2021-11-23 17:32:37,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:32:37,389 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:37,389 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:37,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:37,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2021-11-23 17:32:37,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (78)] Ended with exit code 0 [2021-11-23 17:32:37,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:37,990 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:37,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:37,991 INFO L85 PathProgramCache]: Analyzing trace with hash -173728328, now seen corresponding path program 1 times [2021-11-23 17:32:37,991 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:37,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1455496846] [2021-11-23 17:32:37,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:37,991 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:37,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:37,992 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:37,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Waiting until timeout for monitored process [2021-11-23 17:32:38,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:38,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:38,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:40,076 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:40,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:40,544 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:40,545 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:40,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1455496846] [2021-11-23 17:32:40,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1455496846] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:40,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1410905319] [2021-11-23 17:32:40,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:40,545 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:40,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:40,546 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:40,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Waiting until timeout for monitored process [2021-11-23 17:32:40,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:40,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:40,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:42,491 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:42,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:42,793 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:42,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1410905319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:42,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393425009] [2021-11-23 17:32:42,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:42,793 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:42,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:42,794 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:42,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-23 17:32:42,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:42,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:42,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:44,509 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:32:44,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:45,147 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:32:45,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393425009] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:45,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:45,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:32:45,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943153748] [2021-11-23 17:32:45,148 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:45,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:32:45,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:45,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:32:45,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:32:45,150 INFO L87 Difference]: Start difference. First operand 1218 states and 1528 transitions. Second operand has 34 states, 34 states have (on average 13.235294117647058) internal successors, (450), 33 states have internal predecessors, (450), 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) [2021-11-23 17:32:45,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:45,613 INFO L93 Difference]: Finished difference Result 2314 states and 2934 transitions. [2021-11-23 17:32:45,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:32:45,614 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.235294117647058) internal successors, (450), 33 states have internal predecessors, (450), 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) Word has length 138 [2021-11-23 17:32:45,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:45,616 INFO L225 Difference]: With dead ends: 2314 [2021-11-23 17:32:45,617 INFO L226 Difference]: Without dead ends: 1340 [2021-11-23 17:32:45,618 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 835 GetRequests, 793 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=257, Invalid=1635, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:32:45,619 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 134 mSDsluCounter, 1649 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 1752 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 167 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:45,619 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 1752 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 50 Invalid, 0 Unknown, 167 Unchecked, 0.0s Time] [2021-11-23 17:32:45,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1340 states. [2021-11-23 17:32:45,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1340 to 1340. [2021-11-23 17:32:45,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1340 states, 1339 states have (on average 1.246452576549664) internal successors, (1669), 1339 states have internal predecessors, (1669), 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) [2021-11-23 17:32:45,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1340 states to 1340 states and 1669 transitions. [2021-11-23 17:32:45,698 INFO L78 Accepts]: Start accepts. Automaton has 1340 states and 1669 transitions. Word has length 138 [2021-11-23 17:32:45,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:45,698 INFO L470 AbstractCegarLoop]: Abstraction has 1340 states and 1669 transitions. [2021-11-23 17:32:45,699 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.235294117647058) internal successors, (450), 33 states have internal predecessors, (450), 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) [2021-11-23 17:32:45,699 INFO L276 IsEmpty]: Start isEmpty. Operand 1340 states and 1669 transitions. [2021-11-23 17:32:45,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:32:45,700 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:45,701 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:45,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (80)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:45,913 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (81)] Ended with exit code 0 [2021-11-23 17:32:46,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2021-11-23 17:32:46,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:46,313 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:46,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:46,313 INFO L85 PathProgramCache]: Analyzing trace with hash -1149521912, now seen corresponding path program 1 times [2021-11-23 17:32:46,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:46,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [563056801] [2021-11-23 17:32:46,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:46,313 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:46,314 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:46,314 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:46,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Waiting until timeout for monitored process [2021-11-23 17:32:46,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:46,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:46,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:47,815 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:32:47,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:48,352 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:32:48,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:48,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [563056801] [2021-11-23 17:32:48,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [563056801] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:48,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [687754931] [2021-11-23 17:32:48,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:48,352 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:48,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:48,353 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:48,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Waiting until timeout for monitored process [2021-11-23 17:32:48,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:48,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:48,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:50,709 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:50,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:51,387 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:51,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [687754931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:51,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806411609] [2021-11-23 17:32:51,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:51,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:51,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:51,389 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:51,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-23 17:32:51,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:51,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:32:51,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:53,413 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:53,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:53,975 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:32:53,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806411609] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:53,975 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:53,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:32:53,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242550072] [2021-11-23 17:32:53,976 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:53,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:32:53,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:53,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:32:53,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:32:53,977 INFO L87 Difference]: Start difference. First operand 1340 states and 1669 transitions. Second operand has 48 states, 48 states have (on average 12.979166666666666) internal successors, (623), 47 states have internal predecessors, (623), 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) [2021-11-23 17:32:55,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:32:55,299 INFO L93 Difference]: Finished difference Result 2624 states and 3306 transitions. [2021-11-23 17:32:55,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:32:55,300 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.979166666666666) internal successors, (623), 47 states have internal predecessors, (623), 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) Word has length 138 [2021-11-23 17:32:55,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:32:55,302 INFO L225 Difference]: With dead ends: 2624 [2021-11-23 17:32:55,302 INFO L226 Difference]: Without dead ends: 1650 [2021-11-23 17:32:55,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 781 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=445, Invalid=3977, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:32:55,304 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 326 mSDsluCounter, 2518 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 2622 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 178 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:32:55,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 2622 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 118 Invalid, 0 Unknown, 178 Unchecked, 0.1s Time] [2021-11-23 17:32:55,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1650 states. [2021-11-23 17:32:55,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1650 to 1646. [2021-11-23 17:32:55,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1646 states, 1645 states have (on average 1.2382978723404254) internal successors, (2037), 1645 states have internal predecessors, (2037), 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) [2021-11-23 17:32:55,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1646 states to 1646 states and 2037 transitions. [2021-11-23 17:32:55,404 INFO L78 Accepts]: Start accepts. Automaton has 1646 states and 2037 transitions. Word has length 138 [2021-11-23 17:32:55,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:55,404 INFO L470 AbstractCegarLoop]: Abstraction has 1646 states and 2037 transitions. [2021-11-23 17:32:55,404 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.979166666666666) internal successors, (623), 47 states have internal predecessors, (623), 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) [2021-11-23 17:32:55,404 INFO L276 IsEmpty]: Start isEmpty. Operand 1646 states and 2037 transitions. [2021-11-23 17:32:55,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:32:55,406 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:55,406 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:32:55,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:55,613 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (83)] Ended with exit code 0 [2021-11-23 17:32:55,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (84)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:56,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:56,007 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:56,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:56,007 INFO L85 PathProgramCache]: Analyzing trace with hash -201548024, now seen corresponding path program 1 times [2021-11-23 17:32:56,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:56,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1866805605] [2021-11-23 17:32:56,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:56,008 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:56,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:56,009 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:56,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Waiting until timeout for monitored process [2021-11-23 17:32:56,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:56,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:32:56,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:57,497 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 72 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:32:57,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:57,982 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 72 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:32:57,982 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:57,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1866805605] [2021-11-23 17:32:57,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1866805605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:57,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [225963971] [2021-11-23 17:32:57,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:57,991 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:57,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:57,992 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:57,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Waiting until timeout for monitored process [2021-11-23 17:32:58,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:58,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:32:58,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:00,343 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:00,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:00,968 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:00,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [225963971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:00,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286226341] [2021-11-23 17:33:00,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:00,969 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:00,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:00,969 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:00,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2021-11-23 17:33:01,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:01,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:33:01,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:02,588 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:33:02,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:03,361 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:33:03,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286226341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:03,362 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:03,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:33:03,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170237511] [2021-11-23 17:33:03,362 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:03,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:33:03,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:03,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:33:03,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:33:03,364 INFO L87 Difference]: Start difference. First operand 1646 states and 2037 transitions. Second operand has 48 states, 48 states have (on average 12.8125) internal successors, (615), 47 states have internal predecessors, (615), 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) [2021-11-23 17:33:04,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:04,453 INFO L93 Difference]: Finished difference Result 3166 states and 3952 transitions. [2021-11-23 17:33:04,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:33:04,454 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 12.8125) internal successors, (615), 47 states have internal predecessors, (615), 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) Word has length 138 [2021-11-23 17:33:04,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:04,458 INFO L225 Difference]: With dead ends: 3166 [2021-11-23 17:33:04,458 INFO L226 Difference]: Without dead ends: 2192 [2021-11-23 17:33:04,460 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 850 GetRequests, 784 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=392, Invalid=3768, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 17:33:04,460 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 362 mSDsluCounter, 2711 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 362 SdHoareTripleChecker+Valid, 2814 SdHoareTripleChecker+Invalid, 181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:04,461 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [362 Valid, 2814 Invalid, 181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 49 Invalid, 0 Unknown, 127 Unchecked, 0.0s Time] [2021-11-23 17:33:04,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2192 states. [2021-11-23 17:33:04,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2192 to 2188. [2021-11-23 17:33:04,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2188 states, 2187 states have (on average 1.2258802011888432) internal successors, (2681), 2187 states have internal predecessors, (2681), 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) [2021-11-23 17:33:04,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2188 states to 2188 states and 2681 transitions. [2021-11-23 17:33:04,600 INFO L78 Accepts]: Start accepts. Automaton has 2188 states and 2681 transitions. Word has length 138 [2021-11-23 17:33:04,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:04,600 INFO L470 AbstractCegarLoop]: Abstraction has 2188 states and 2681 transitions. [2021-11-23 17:33:04,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 12.8125) internal successors, (615), 47 states have internal predecessors, (615), 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) [2021-11-23 17:33:04,601 INFO L276 IsEmpty]: Start isEmpty. Operand 2188 states and 2681 transitions. [2021-11-23 17:33:04,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:33:04,603 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:04,604 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:04,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (87)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:04,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (86)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:05,025 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2021-11-23 17:33:05,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:05,205 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:05,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:05,205 INFO L85 PathProgramCache]: Analyzing trace with hash 342756872, now seen corresponding path program 1 times [2021-11-23 17:33:05,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:05,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [540383747] [2021-11-23 17:33:05,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:05,206 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:05,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:05,207 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:05,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Waiting until timeout for monitored process [2021-11-23 17:33:05,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:05,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:05,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:06,690 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 76 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:06,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:07,108 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 76 proven. 28 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:07,108 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:07,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [540383747] [2021-11-23 17:33:07,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [540383747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:07,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1640717871] [2021-11-23 17:33:07,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:07,109 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:07,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:07,109 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:07,110 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Waiting until timeout for monitored process [2021-11-23 17:33:07,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:07,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:07,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:09,233 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:09,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:09,906 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:09,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1640717871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:09,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700003480] [2021-11-23 17:33:09,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:09,907 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:09,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:09,908 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:09,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2021-11-23 17:33:09,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:09,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:33:09,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:11,550 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:33:11,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:12,303 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:33:12,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700003480] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:12,303 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:12,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 49 [2021-11-23 17:33:12,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203323203] [2021-11-23 17:33:12,304 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:12,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-23 17:33:12,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:12,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-23 17:33:12,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2242, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:33:12,305 INFO L87 Difference]: Start difference. First operand 2188 states and 2681 transitions. Second operand has 50 states, 50 states have (on average 12.36) internal successors, (618), 49 states have internal predecessors, (618), 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) [2021-11-23 17:33:13,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:13,470 INFO L93 Difference]: Finished difference Result 3162 states and 3942 transitions. [2021-11-23 17:33:13,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:33:13,471 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 12.36) internal successors, (618), 49 states have internal predecessors, (618), 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) Word has length 138 [2021-11-23 17:33:13,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:13,474 INFO L225 Difference]: With dead ends: 3162 [2021-11-23 17:33:13,474 INFO L226 Difference]: Without dead ends: 2188 [2021-11-23 17:33:13,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 849 GetRequests, 783 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1099 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=406, Invalid=4016, Unknown=0, NotChecked=0, Total=4422 [2021-11-23 17:33:13,476 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 154 mSDsluCounter, 2327 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 2408 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 184 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:13,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 2408 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 74 Invalid, 0 Unknown, 184 Unchecked, 0.1s Time] [2021-11-23 17:33:13,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2188 states. [2021-11-23 17:33:13,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2188 to 2188. [2021-11-23 17:33:13,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2188 states, 2187 states have (on average 1.2240512117055327) internal successors, (2677), 2187 states have internal predecessors, (2677), 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) [2021-11-23 17:33:13,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2188 states to 2188 states and 2677 transitions. [2021-11-23 17:33:13,697 INFO L78 Accepts]: Start accepts. Automaton has 2188 states and 2677 transitions. Word has length 138 [2021-11-23 17:33:13,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:13,698 INFO L470 AbstractCegarLoop]: Abstraction has 2188 states and 2677 transitions. [2021-11-23 17:33:13,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 12.36) internal successors, (618), 49 states have internal predecessors, (618), 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) [2021-11-23 17:33:13,698 INFO L276 IsEmpty]: Start isEmpty. Operand 2188 states and 2677 transitions. [2021-11-23 17:33:13,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-23 17:33:13,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:13,701 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:13,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:13,922 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (89)] Ended with exit code 0 [2021-11-23 17:33:14,116 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (90)] Ended with exit code 0 [2021-11-23 17:33:14,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:14,315 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:14,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:14,316 INFO L85 PathProgramCache]: Analyzing trace with hash -1332740856, now seen corresponding path program 1 times [2021-11-23 17:33:14,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:14,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1708030723] [2021-11-23 17:33:14,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:14,316 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:14,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:14,317 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:14,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Waiting until timeout for monitored process [2021-11-23 17:33:14,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:14,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:14,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:15,551 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 80 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:33:15,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:16,148 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 80 proven. 22 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:33:16,148 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:16,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1708030723] [2021-11-23 17:33:16,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1708030723] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:16,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1750437399] [2021-11-23 17:33:16,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:16,149 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:16,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:16,149 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:16,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Waiting until timeout for monitored process [2021-11-23 17:33:16,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:16,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:16,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:17,746 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:17,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:18,284 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:18,285 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1750437399] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:18,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707810142] [2021-11-23 17:33:18,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:18,285 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:18,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:18,286 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:18,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2021-11-23 17:33:18,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:18,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:33:18,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:19,691 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:33:19,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:20,432 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 47 proven. 60 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:33:20,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707810142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:20,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:20,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:33:20,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558082780] [2021-11-23 17:33:20,432 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:20,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:33:20,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:20,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:33:20,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:33:20,434 INFO L87 Difference]: Start difference. First operand 2188 states and 2677 transitions. Second operand has 39 states, 39 states have (on average 13.717948717948717) internal successors, (535), 38 states have internal predecessors, (535), 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) [2021-11-23 17:33:21,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:21,368 INFO L93 Difference]: Finished difference Result 3287 states and 4094 transitions. [2021-11-23 17:33:21,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:33:21,368 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 13.717948717948717) internal successors, (535), 38 states have internal predecessors, (535), 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) Word has length 138 [2021-11-23 17:33:21,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:21,377 INFO L225 Difference]: With dead ends: 3287 [2021-11-23 17:33:21,378 INFO L226 Difference]: Without dead ends: 2313 [2021-11-23 17:33:21,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 844 GetRequests, 789 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 729 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=365, Invalid=2605, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:33:21,382 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 251 mSDsluCounter, 1868 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 1955 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 253 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:21,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [251 Valid, 1955 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 122 Invalid, 0 Unknown, 253 Unchecked, 0.1s Time] [2021-11-23 17:33:21,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2021-11-23 17:33:21,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 2310. [2021-11-23 17:33:21,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2310 states, 2309 states have (on average 1.2187093980077957) internal successors, (2814), 2309 states have internal predecessors, (2814), 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) [2021-11-23 17:33:21,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2310 states to 2310 states and 2814 transitions. [2021-11-23 17:33:21,606 INFO L78 Accepts]: Start accepts. Automaton has 2310 states and 2814 transitions. Word has length 138 [2021-11-23 17:33:21,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:21,607 INFO L470 AbstractCegarLoop]: Abstraction has 2310 states and 2814 transitions. [2021-11-23 17:33:21,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 13.717948717948717) internal successors, (535), 38 states have internal predecessors, (535), 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) [2021-11-23 17:33:21,607 INFO L276 IsEmpty]: Start isEmpty. Operand 2310 states and 2814 transitions. [2021-11-23 17:33:21,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:33:21,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:21,611 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:21,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (92)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:21,823 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (93)] Ended with exit code 0 [2021-11-23 17:33:22,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2021-11-23 17:33:22,222 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:22,222 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:22,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:22,223 INFO L85 PathProgramCache]: Analyzing trace with hash 879054242, now seen corresponding path program 1 times [2021-11-23 17:33:22,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:22,223 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [329279351] [2021-11-23 17:33:22,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:22,223 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:22,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:22,224 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:22,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Waiting until timeout for monitored process [2021-11-23 17:33:22,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:22,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:22,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:24,035 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:24,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:24,650 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:24,650 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:24,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [329279351] [2021-11-23 17:33:24,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [329279351] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:24,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1194914313] [2021-11-23 17:33:24,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:24,651 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:24,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:24,651 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:24,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Waiting until timeout for monitored process [2021-11-23 17:33:24,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:24,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:24,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:26,335 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:26,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:26,804 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:26,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1194914313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:26,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906884630] [2021-11-23 17:33:26,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:26,804 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:26,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:26,805 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:26,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2021-11-23 17:33:26,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:26,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:26,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:28,437 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:28,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:28,895 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:28,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906884630] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:28,895 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:28,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:33:28,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714834914] [2021-11-23 17:33:28,896 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:28,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:33:28,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:28,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:33:28,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:33:28,897 INFO L87 Difference]: Start difference. First operand 2310 states and 2814 transitions. Second operand has 26 states, 26 states have (on average 10.038461538461538) internal successors, (261), 25 states have internal predecessors, (261), 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) [2021-11-23 17:33:30,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:30,370 INFO L93 Difference]: Finished difference Result 5638 states and 7084 transitions. [2021-11-23 17:33:30,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-23 17:33:30,370 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 10.038461538461538) internal successors, (261), 25 states have internal predecessors, (261), 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) Word has length 139 [2021-11-23 17:33:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:30,385 INFO L225 Difference]: With dead ends: 5638 [2021-11-23 17:33:30,385 INFO L226 Difference]: Without dead ends: 4642 [2021-11-23 17:33:30,387 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 866 GetRequests, 809 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=369, Invalid=3053, Unknown=0, NotChecked=0, Total=3422 [2021-11-23 17:33:30,391 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 365 mSDsluCounter, 2764 mSDsCounter, 0 mSdLazyCounter, 618 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 2933 SdHoareTripleChecker+Invalid, 1551 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 618 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 896 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:30,391 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [365 Valid, 2933 Invalid, 1551 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 618 Invalid, 0 Unknown, 896 Unchecked, 0.4s Time] [2021-11-23 17:33:30,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4642 states. [2021-11-23 17:33:30,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4642 to 2605. [2021-11-23 17:33:30,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2605 states, 2604 states have (on average 1.2150537634408602) internal successors, (3164), 2604 states have internal predecessors, (3164), 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) [2021-11-23 17:33:30,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2605 states to 2605 states and 3164 transitions. [2021-11-23 17:33:30,677 INFO L78 Accepts]: Start accepts. Automaton has 2605 states and 3164 transitions. Word has length 139 [2021-11-23 17:33:30,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:30,677 INFO L470 AbstractCegarLoop]: Abstraction has 2605 states and 3164 transitions. [2021-11-23 17:33:30,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 10.038461538461538) internal successors, (261), 25 states have internal predecessors, (261), 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) [2021-11-23 17:33:30,678 INFO L276 IsEmpty]: Start isEmpty. Operand 2605 states and 3164 transitions. [2021-11-23 17:33:30,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:33:30,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:30,680 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:30,717 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:30,891 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (96)] Ended with exit code 0 [2021-11-23 17:33:31,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (95)] Ended with exit code 0 [2021-11-23 17:33:31,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:31,291 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:31,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:31,291 INFO L85 PathProgramCache]: Analyzing trace with hash 1034900498, now seen corresponding path program 1 times [2021-11-23 17:33:31,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:31,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [291012644] [2021-11-23 17:33:31,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:31,292 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:31,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:31,293 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:31,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Waiting until timeout for monitored process [2021-11-23 17:33:31,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:31,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:31,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:32,853 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:32,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:33,477 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 68 proven. 40 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:33:33,478 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:33,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [291012644] [2021-11-23 17:33:33,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [291012644] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:33,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [623477819] [2021-11-23 17:33:33,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:33,478 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:33,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:33,479 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:33,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Waiting until timeout for monitored process [2021-11-23 17:33:33,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:33,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:33,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:35,997 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:35,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:36,684 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:36,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [623477819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:36,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126210515] [2021-11-23 17:33:36,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:36,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:36,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:36,694 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:36,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2021-11-23 17:33:36,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:36,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:36,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:38,588 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:38,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:39,098 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 39 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:39,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1126210515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:39,098 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:39,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 13, 13] total 39 [2021-11-23 17:33:39,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419740327] [2021-11-23 17:33:39,099 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:39,100 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 17:33:39,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:39,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 17:33:39,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 17:33:39,101 INFO L87 Difference]: Start difference. First operand 2605 states and 3164 transitions. Second operand has 40 states, 40 states have (on average 11.325) internal successors, (453), 39 states have internal predecessors, (453), 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) [2021-11-23 17:33:46,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:46,029 INFO L93 Difference]: Finished difference Result 11135 states and 13786 transitions. [2021-11-23 17:33:46,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-11-23 17:33:46,029 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 11.325) internal successors, (453), 39 states have internal predecessors, (453), 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) Word has length 139 [2021-11-23 17:33:46,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:46,041 INFO L225 Difference]: With dead ends: 11135 [2021-11-23 17:33:46,042 INFO L226 Difference]: Without dead ends: 9222 [2021-11-23 17:33:46,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 992 GetRequests, 816 SyntacticMatches, 6 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10459 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2021, Invalid=27391, Unknown=0, NotChecked=0, Total=29412 [2021-11-23 17:33:46,047 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 1036 mSDsluCounter, 4274 mSDsCounter, 0 mSdLazyCounter, 1166 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1036 SdHoareTripleChecker+Valid, 4474 SdHoareTripleChecker+Invalid, 3792 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 1166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 2542 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:46,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1036 Valid, 4474 Invalid, 3792 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 1166 Invalid, 0 Unknown, 2542 Unchecked, 0.8s Time] [2021-11-23 17:33:46,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9222 states. [2021-11-23 17:33:46,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9222 to 4804. [2021-11-23 17:33:46,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4804 states, 4803 states have (on average 1.2094524255673538) internal successors, (5809), 4803 states have internal predecessors, (5809), 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) [2021-11-23 17:33:46,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4804 states to 4804 states and 5809 transitions. [2021-11-23 17:33:46,460 INFO L78 Accepts]: Start accepts. Automaton has 4804 states and 5809 transitions. Word has length 139 [2021-11-23 17:33:46,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:46,461 INFO L470 AbstractCegarLoop]: Abstraction has 4804 states and 5809 transitions. [2021-11-23 17:33:46,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 11.325) internal successors, (453), 39 states have internal predecessors, (453), 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) [2021-11-23 17:33:46,461 INFO L276 IsEmpty]: Start isEmpty. Operand 4804 states and 5809 transitions. [2021-11-23 17:33:46,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:33:46,464 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:46,464 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:46,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:46,696 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2021-11-23 17:33:46,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (99)] Ended with exit code 0 [2021-11-23 17:33:47,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:47,076 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:47,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:47,076 INFO L85 PathProgramCache]: Analyzing trace with hash 619250948, now seen corresponding path program 1 times [2021-11-23 17:33:47,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:47,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [9874055] [2021-11-23 17:33:47,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:47,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:47,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:47,078 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:47,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Waiting until timeout for monitored process [2021-11-23 17:33:47,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:47,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:47,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:48,378 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:48,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:48,968 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:33:48,968 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:48,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [9874055] [2021-11-23 17:33:48,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [9874055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:48,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1024690068] [2021-11-23 17:33:48,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:48,968 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:48,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:48,969 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:48,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Waiting until timeout for monitored process [2021-11-23 17:33:49,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:49,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:49,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:51,783 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:51,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:52,339 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:52,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1024690068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:52,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819365130] [2021-11-23 17:33:52,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:52,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:52,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:52,340 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:52,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2021-11-23 17:33:52,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:52,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:33:52,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:54,341 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:33:54,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:54,989 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:33:54,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819365130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:54,990 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:54,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:33:54,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341482539] [2021-11-23 17:33:54,990 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:54,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:33:54,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:54,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:33:54,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:33:54,991 INFO L87 Difference]: Start difference. First operand 4804 states and 5809 transitions. Second operand has 48 states, 48 states have (on average 13.520833333333334) internal successors, (649), 47 states have internal predecessors, (649), 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) [2021-11-23 17:33:56,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:56,650 INFO L93 Difference]: Finished difference Result 10001 states and 12140 transitions. [2021-11-23 17:33:56,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 17:33:56,651 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 13.520833333333334) internal successors, (649), 47 states have internal predecessors, (649), 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) Word has length 139 [2021-11-23 17:33:56,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:56,656 INFO L225 Difference]: With dead ends: 10001 [2021-11-23 17:33:56,656 INFO L226 Difference]: Without dead ends: 5775 [2021-11-23 17:33:56,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 789 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1121 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=449, Invalid=4107, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 17:33:56,661 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 333 mSDsluCounter, 3495 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 3623 SdHoareTripleChecker+Invalid, 752 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 510 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:56,661 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [333 Valid, 3623 Invalid, 752 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 235 Invalid, 0 Unknown, 510 Unchecked, 0.1s Time] [2021-11-23 17:33:56,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5775 states. [2021-11-23 17:33:57,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5775 to 5373. [2021-11-23 17:33:57,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5373 states, 5372 states have (on average 1.2071854058078928) internal successors, (6485), 5372 states have internal predecessors, (6485), 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) [2021-11-23 17:33:57,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5373 states to 5373 states and 6485 transitions. [2021-11-23 17:33:57,067 INFO L78 Accepts]: Start accepts. Automaton has 5373 states and 6485 transitions. Word has length 139 [2021-11-23 17:33:57,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:57,067 INFO L470 AbstractCegarLoop]: Abstraction has 5373 states and 6485 transitions. [2021-11-23 17:33:57,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 13.520833333333334) internal successors, (649), 47 states have internal predecessors, (649), 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) [2021-11-23 17:33:57,068 INFO L276 IsEmpty]: Start isEmpty. Operand 5373 states and 6485 transitions. [2021-11-23 17:33:57,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:33:57,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:57,071 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:33:57,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:57,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2021-11-23 17:33:57,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (101)] Ended with exit code 0 [2021-11-23 17:33:57,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:57,673 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:57,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:57,674 INFO L85 PathProgramCache]: Analyzing trace with hash -642903349, now seen corresponding path program 1 times [2021-11-23 17:33:57,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:57,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [364436512] [2021-11-23 17:33:57,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:57,674 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:57,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:57,675 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:57,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Waiting until timeout for monitored process [2021-11-23 17:33:57,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:57,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:33:57,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:59,788 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:59,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:00,263 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:00,263 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:00,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [364436512] [2021-11-23 17:34:00,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [364436512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:00,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [996940636] [2021-11-23 17:34:00,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:00,264 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:00,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:00,264 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:00,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Waiting until timeout for monitored process [2021-11-23 17:34:00,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:00,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:00,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:02,443 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:02,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:02,738 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:02,739 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [996940636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:02,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984340815] [2021-11-23 17:34:02,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:02,739 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:02,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:02,740 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:02,740 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2021-11-23 17:34:02,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:02,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:02,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:34:04,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:05,167 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:34:05,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984340815] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:05,167 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:05,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:34:05,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102575368] [2021-11-23 17:34:05,168 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:05,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:34:05,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:05,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:34:05,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:34:05,169 INFO L87 Difference]: Start difference. First operand 5373 states and 6485 transitions. Second operand has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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) [2021-11-23 17:34:05,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:05,822 INFO L93 Difference]: Finished difference Result 9619 states and 11673 transitions. [2021-11-23 17:34:05,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:34:05,822 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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) Word has length 139 [2021-11-23 17:34:05,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:05,827 INFO L225 Difference]: With dead ends: 9619 [2021-11-23 17:34:05,827 INFO L226 Difference]: Without dead ends: 5393 [2021-11-23 17:34:05,831 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=245, Invalid=1647, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:34:05,832 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 180 mSDsluCounter, 1759 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 1863 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 170 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:05,832 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 1863 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 61 Invalid, 0 Unknown, 170 Unchecked, 0.0s Time] [2021-11-23 17:34:05,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5393 states. [2021-11-23 17:34:06,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5393 to 5381. [2021-11-23 17:34:06,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5381 states, 5380 states have (on average 1.2068773234200743) internal successors, (6493), 5380 states have internal predecessors, (6493), 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) [2021-11-23 17:34:06,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5381 states to 5381 states and 6493 transitions. [2021-11-23 17:34:06,243 INFO L78 Accepts]: Start accepts. Automaton has 5381 states and 6493 transitions. Word has length 139 [2021-11-23 17:34:06,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:06,243 INFO L470 AbstractCegarLoop]: Abstraction has 5381 states and 6493 transitions. [2021-11-23 17:34:06,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 13.205882352941176) internal successors, (449), 33 states have internal predecessors, (449), 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) [2021-11-23 17:34:06,243 INFO L276 IsEmpty]: Start isEmpty. Operand 5381 states and 6493 transitions. [2021-11-23 17:34:06,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:06,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:06,247 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:06,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:06,481 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (104)] Ended with exit code 0 [2021-11-23 17:34:06,676 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (105)] Ended with exit code 0 [2021-11-23 17:34:06,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:06,875 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:06,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:06,875 INFO L85 PathProgramCache]: Analyzing trace with hash 1942141885, now seen corresponding path program 1 times [2021-11-23 17:34:06,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:06,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [181423758] [2021-11-23 17:34:06,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:06,876 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:06,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:06,877 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:06,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Waiting until timeout for monitored process [2021-11-23 17:34:06,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:06,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:34:06,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:07,681 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 97 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 17:34:07,681 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:07,681 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:07,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [181423758] [2021-11-23 17:34:07,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [181423758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:07,682 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:07,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:34:07,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863319939] [2021-11-23 17:34:07,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:07,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:34:07,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:07,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:34:07,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:07,683 INFO L87 Difference]: Start difference. First operand 5381 states and 6493 transitions. Second operand has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 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) [2021-11-23 17:34:08,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:08,101 INFO L93 Difference]: Finished difference Result 11198 states and 13622 transitions. [2021-11-23 17:34:08,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:34:08,102 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 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) Word has length 139 [2021-11-23 17:34:08,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:08,108 INFO L225 Difference]: With dead ends: 11198 [2021-11-23 17:34:08,108 INFO L226 Difference]: Without dead ends: 6594 [2021-11-23 17:34:08,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:34:08,113 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 69 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:08,113 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 322 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 42 Unchecked, 0.0s Time] [2021-11-23 17:34:08,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6594 states. [2021-11-23 17:34:08,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6594 to 6560. [2021-11-23 17:34:08,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6560 states, 6559 states have (on average 1.211007775575545) internal successors, (7943), 6559 states have internal predecessors, (7943), 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) [2021-11-23 17:34:08,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6560 states to 6560 states and 7943 transitions. [2021-11-23 17:34:08,558 INFO L78 Accepts]: Start accepts. Automaton has 6560 states and 7943 transitions. Word has length 139 [2021-11-23 17:34:08,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:08,558 INFO L470 AbstractCegarLoop]: Abstraction has 6560 states and 7943 transitions. [2021-11-23 17:34:08,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.0) internal successors, (132), 5 states have internal predecessors, (132), 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) [2021-11-23 17:34:08,558 INFO L276 IsEmpty]: Start isEmpty. Operand 6560 states and 7943 transitions. [2021-11-23 17:34:08,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:08,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:08,561 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:08,568 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (107)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:08,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:08,761 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:08,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:08,762 INFO L85 PathProgramCache]: Analyzing trace with hash 387809053, now seen corresponding path program 1 times [2021-11-23 17:34:08,762 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:08,762 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2026786240] [2021-11-23 17:34:08,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:08,762 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:08,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:08,763 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:08,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:34:08,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:08,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:08,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:10,315 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:34:10,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:10,825 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 69 proven. 34 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 17:34:10,825 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:10,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2026786240] [2021-11-23 17:34:10,826 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2026786240] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:10,826 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1389613185] [2021-11-23 17:34:10,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:10,826 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:10,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:10,827 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:10,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:34:10,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:10,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:10,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:12,768 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:12,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:13,226 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:13,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1389613185] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:13,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [757986447] [2021-11-23 17:34:13,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:13,226 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:13,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:13,227 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:13,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:34:13,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:13,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:13,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:15,199 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:34:15,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 24 proven. 82 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:34:15,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [757986447] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:15,872 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:15,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 38 [2021-11-23 17:34:15,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549335317] [2021-11-23 17:34:15,873 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:15,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-23 17:34:15,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:15,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-23 17:34:15,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:34:15,874 INFO L87 Difference]: Start difference. First operand 6560 states and 7943 transitions. Second operand has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 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) [2021-11-23 17:34:17,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:17,310 INFO L93 Difference]: Finished difference Result 12047 states and 14620 transitions. [2021-11-23 17:34:17,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:34:17,313 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 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) Word has length 139 [2021-11-23 17:34:17,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:17,320 INFO L225 Difference]: With dead ends: 12047 [2021-11-23 17:34:17,320 INFO L226 Difference]: Without dead ends: 7424 [2021-11-23 17:34:17,323 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 854 GetRequests, 797 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=378, Invalid=2814, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 17:34:17,324 INFO L933 BasicCegarLoop]: 87 mSDtfsCounter, 233 mSDsluCounter, 1668 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 1755 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:17,324 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 1755 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 66 Invalid, 0 Unknown, 158 Unchecked, 0.0s Time] [2021-11-23 17:34:17,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7424 states. [2021-11-23 17:34:17,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7424 to 7422. [2021-11-23 17:34:17,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7422 states, 7421 states have (on average 1.2061716749764182) internal successors, (8951), 7421 states have internal predecessors, (8951), 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) [2021-11-23 17:34:17,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7422 states to 7422 states and 8951 transitions. [2021-11-23 17:34:17,833 INFO L78 Accepts]: Start accepts. Automaton has 7422 states and 8951 transitions. Word has length 139 [2021-11-23 17:34:17,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:17,833 INFO L470 AbstractCegarLoop]: Abstraction has 7422 states and 8951 transitions. [2021-11-23 17:34:17,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 15.128205128205128) internal successors, (590), 38 states have internal predecessors, (590), 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) [2021-11-23 17:34:17,834 INFO L276 IsEmpty]: Start isEmpty. Operand 7422 states and 8951 transitions. [2021-11-23 17:34:17,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:17,838 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:17,838 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:17,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:18,061 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Ended with exit code 0 [2021-11-23 17:34:18,256 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Ended with exit code 0 [2021-11-23 17:34:18,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:18,455 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:18,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:18,455 INFO L85 PathProgramCache]: Analyzing trace with hash 1589053503, now seen corresponding path program 1 times [2021-11-23 17:34:18,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:18,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1639280268] [2021-11-23 17:34:18,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:18,456 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:18,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:18,457 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:18,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:34:18,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:18,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:18,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:19,962 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:19,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:20,389 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 74 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:20,389 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:20,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1639280268] [2021-11-23 17:34:20,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1639280268] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:20,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [462168924] [2021-11-23 17:34:20,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:20,389 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:20,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:20,390 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:20,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:34:20,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:20,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:34:20,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:20,807 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 105 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:34:20,807 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:20,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [462168924] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:20,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:34:20,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10, 10] total 22 [2021-11-23 17:34:20,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270724750] [2021-11-23 17:34:20,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:20,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:34:20,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:20,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:34:20,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:34:20,808 INFO L87 Difference]: Start difference. First operand 7422 states and 8951 transitions. Second operand has 4 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 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) [2021-11-23 17:34:21,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:21,438 INFO L93 Difference]: Finished difference Result 13555 states and 16599 transitions. [2021-11-23 17:34:21,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 17:34:21,439 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 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) Word has length 139 [2021-11-23 17:34:21,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:21,446 INFO L225 Difference]: With dead ends: 13555 [2021-11-23 17:34:21,446 INFO L226 Difference]: Without dead ends: 8896 [2021-11-23 17:34:21,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 394 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:34:21,451 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 54 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:21,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 239 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:34:21,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8896 states. [2021-11-23 17:34:21,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8896 to 7024. [2021-11-23 17:34:21,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7024 states, 7023 states have (on average 1.2202762352271108) internal successors, (8570), 7023 states have internal predecessors, (8570), 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) [2021-11-23 17:34:21,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7024 states to 7024 states and 8570 transitions. [2021-11-23 17:34:21,968 INFO L78 Accepts]: Start accepts. Automaton has 7024 states and 8570 transitions. Word has length 139 [2021-11-23 17:34:21,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:21,969 INFO L470 AbstractCegarLoop]: Abstraction has 7024 states and 8570 transitions. [2021-11-23 17:34:21,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 34.0) internal successors, (136), 4 states have internal predecessors, (136), 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) [2021-11-23 17:34:21,969 INFO L276 IsEmpty]: Start isEmpty. Operand 7024 states and 8570 transitions. [2021-11-23 17:34:21,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:21,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:21,974 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:21,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:22,182 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Ended with exit code 0 [2021-11-23 17:34:22,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:22,376 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:22,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:22,376 INFO L85 PathProgramCache]: Analyzing trace with hash 34720671, now seen corresponding path program 1 times [2021-11-23 17:34:22,377 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:22,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [723046388] [2021-11-23 17:34:22,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:22,377 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:22,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:22,378 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:22,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Waiting until timeout for monitored process [2021-11-23 17:34:22,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:22,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:22,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:24,032 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:24,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:24,472 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:24,473 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:24,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [723046388] [2021-11-23 17:34:24,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [723046388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:24,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [77786547] [2021-11-23 17:34:24,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:24,473 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:24,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:24,474 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:24,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Waiting until timeout for monitored process [2021-11-23 17:34:24,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:24,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:24,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:26,302 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:26,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:26,683 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 28 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:34:26,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [77786547] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:26,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700874385] [2021-11-23 17:34:26,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:26,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:26,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:26,685 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:26,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2021-11-23 17:34:26,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:26,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:34:26,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:27,514 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:34:27,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:28,183 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 73 proven. 24 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 17:34:28,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700874385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:28,183 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:28,183 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 5, 5] total 24 [2021-11-23 17:34:28,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136592171] [2021-11-23 17:34:28,184 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:28,184 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 17:34:28,184 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:28,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 17:34:28,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2021-11-23 17:34:28,185 INFO L87 Difference]: Start difference. First operand 7024 states and 8570 transitions. Second operand has 25 states, 25 states have (on average 15.12) internal successors, (378), 24 states have internal predecessors, (378), 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) [2021-11-23 17:34:28,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:28,875 INFO L93 Difference]: Finished difference Result 12877 states and 15814 transitions. [2021-11-23 17:34:28,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 17:34:28,875 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 15.12) internal successors, (378), 24 states have internal predecessors, (378), 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) Word has length 139 [2021-11-23 17:34:28,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:28,882 INFO L225 Difference]: With dead ends: 12877 [2021-11-23 17:34:28,883 INFO L226 Difference]: Without dead ends: 7024 [2021-11-23 17:34:28,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 808 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=206, Invalid=984, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 17:34:28,889 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 160 mSDsluCounter, 781 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 866 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:28,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 866 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 101 Unchecked, 0.0s Time] [2021-11-23 17:34:28,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7024 states. [2021-11-23 17:34:29,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7024 to 6990. [2021-11-23 17:34:29,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6990 states, 6989 states have (on average 1.2207755043640005) internal successors, (8532), 6989 states have internal predecessors, (8532), 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) [2021-11-23 17:34:29,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6990 states to 6990 states and 8532 transitions. [2021-11-23 17:34:29,438 INFO L78 Accepts]: Start accepts. Automaton has 6990 states and 8532 transitions. Word has length 139 [2021-11-23 17:34:29,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:29,438 INFO L470 AbstractCegarLoop]: Abstraction has 6990 states and 8532 transitions. [2021-11-23 17:34:29,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 15.12) internal successors, (378), 24 states have internal predecessors, (378), 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) [2021-11-23 17:34:29,438 INFO L276 IsEmpty]: Start isEmpty. Operand 6990 states and 8532 transitions. [2021-11-23 17:34:29,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:29,441 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:29,441 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:29,450 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:29,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2021-11-23 17:34:29,843 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (114)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:30,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:30,042 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:30,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:30,042 INFO L85 PathProgramCache]: Analyzing trace with hash -106240803, now seen corresponding path program 1 times [2021-11-23 17:34:30,042 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:30,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2067817802] [2021-11-23 17:34:30,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:30,043 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:30,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:30,043 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:30,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Waiting until timeout for monitored process [2021-11-23 17:34:30,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:30,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:34:30,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:31,303 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:34:31,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:31,908 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:34:31,908 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:31,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2067817802] [2021-11-23 17:34:31,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2067817802] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:31,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [741028050] [2021-11-23 17:34:31,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:31,908 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:31,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:31,909 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:31,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Waiting until timeout for monitored process [2021-11-23 17:34:32,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:32,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:34:32,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:34,966 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:34,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:35,506 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:35,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [741028050] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:35,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979903076] [2021-11-23 17:34:35,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:35,506 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:35,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:35,507 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:35,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2021-11-23 17:34:35,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:35,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:34:35,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:37,552 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:34:37,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:38,245 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:34:38,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979903076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:38,245 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:38,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 13, 13, 8, 8] total 47 [2021-11-23 17:34:38,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065262030] [2021-11-23 17:34:38,246 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:38,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 17:34:38,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:38,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 17:34:38,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2056, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 17:34:38,248 INFO L87 Difference]: Start difference. First operand 6990 states and 8532 transitions. Second operand has 48 states, 48 states have (on average 13.5) internal successors, (648), 47 states have internal predecessors, (648), 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) [2021-11-23 17:34:39,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:39,930 INFO L93 Difference]: Finished difference Result 12773 states and 15677 transitions. [2021-11-23 17:34:39,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:34:39,930 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 13.5) internal successors, (648), 47 states have internal predecessors, (648), 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) Word has length 139 [2021-11-23 17:34:39,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:39,936 INFO L225 Difference]: With dead ends: 12773 [2021-11-23 17:34:39,936 INFO L226 Difference]: Without dead ends: 7425 [2021-11-23 17:34:39,942 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 854 GetRequests, 787 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1079 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=418, Invalid=3872, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:34:39,942 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 188 mSDsluCounter, 2827 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 2933 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:39,943 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 2933 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 88 Invalid, 0 Unknown, 208 Unchecked, 0.1s Time] [2021-11-23 17:34:39,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7425 states. [2021-11-23 17:34:40,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7425 to 7365. [2021-11-23 17:34:40,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7365 states, 7364 states have (on average 1.2187669744703966) internal successors, (8975), 7364 states have internal predecessors, (8975), 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) [2021-11-23 17:34:40,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7365 states to 7365 states and 8975 transitions. [2021-11-23 17:34:40,458 INFO L78 Accepts]: Start accepts. Automaton has 7365 states and 8975 transitions. Word has length 139 [2021-11-23 17:34:40,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:40,458 INFO L470 AbstractCegarLoop]: Abstraction has 7365 states and 8975 transitions. [2021-11-23 17:34:40,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 13.5) internal successors, (648), 47 states have internal predecessors, (648), 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) [2021-11-23 17:34:40,458 INFO L276 IsEmpty]: Start isEmpty. Operand 7365 states and 8975 transitions. [2021-11-23 17:34:40,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:40,460 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:40,461 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:40,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (116)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:40,681 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2021-11-23 17:34:40,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:41,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:41,062 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:41,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:41,062 INFO L85 PathProgramCache]: Analyzing trace with hash -1310253148, now seen corresponding path program 1 times [2021-11-23 17:34:41,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:41,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1363744039] [2021-11-23 17:34:41,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:41,063 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:41,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:41,063 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:41,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Waiting until timeout for monitored process [2021-11-23 17:34:41,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:41,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:34:41,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:41,857 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 94 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 17:34:41,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:41,857 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:41,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1363744039] [2021-11-23 17:34:41,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1363744039] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:41,858 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:41,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:34:41,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653145622] [2021-11-23 17:34:41,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:41,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:34:41,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:41,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:34:41,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:41,859 INFO L87 Difference]: Start difference. First operand 7365 states and 8975 transitions. Second operand has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 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) [2021-11-23 17:34:42,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:42,451 INFO L93 Difference]: Finished difference Result 14931 states and 18305 transitions. [2021-11-23 17:34:42,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:34:42,451 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 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) Word has length 139 [2021-11-23 17:34:42,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:42,459 INFO L225 Difference]: With dead ends: 14931 [2021-11-23 17:34:42,460 INFO L226 Difference]: Without dead ends: 9023 [2021-11-23 17:34:42,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:34:42,465 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 104 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:42,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 267 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 39 Unchecked, 0.0s Time] [2021-11-23 17:34:42,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9023 states. [2021-11-23 17:34:43,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9023 to 8985. [2021-11-23 17:34:43,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8985 states, 8984 states have (on average 1.2168299198575245) internal successors, (10932), 8984 states have internal predecessors, (10932), 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) [2021-11-23 17:34:43,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8985 states to 8985 states and 10932 transitions. [2021-11-23 17:34:43,196 INFO L78 Accepts]: Start accepts. Automaton has 8985 states and 10932 transitions. Word has length 139 [2021-11-23 17:34:43,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:43,196 INFO L470 AbstractCegarLoop]: Abstraction has 8985 states and 10932 transitions. [2021-11-23 17:34:43,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.833333333333332) internal successors, (131), 5 states have internal predecessors, (131), 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) [2021-11-23 17:34:43,196 INFO L276 IsEmpty]: Start isEmpty. Operand 8985 states and 10932 transitions. [2021-11-23 17:34:43,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-23 17:34:43,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:43,199 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:43,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (119)] Ended with exit code 0 [2021-11-23 17:34:43,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:43,400 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:43,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:43,400 INFO L85 PathProgramCache]: Analyzing trace with hash 1165232127, now seen corresponding path program 1 times [2021-11-23 17:34:43,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:43,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1967434938] [2021-11-23 17:34:43,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:43,401 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:43,401 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:43,402 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:43,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Waiting until timeout for monitored process [2021-11-23 17:34:43,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:43,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:34:43,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:44,163 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 17:34:44,163 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:34:44,163 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:44,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1967434938] [2021-11-23 17:34:44,164 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1967434938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:34:44,164 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:34:44,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:34:44,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524055454] [2021-11-23 17:34:44,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:34:44,164 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:34:44,164 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:44,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:34:44,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:34:44,165 INFO L87 Difference]: Start difference. First operand 8985 states and 10932 transitions. Second operand has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 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) [2021-11-23 17:34:45,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:45,038 INFO L93 Difference]: Finished difference Result 18088 states and 22127 transitions. [2021-11-23 17:34:45,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:34:45,038 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 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) Word has length 139 [2021-11-23 17:34:45,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:45,049 INFO L225 Difference]: With dead ends: 18088 [2021-11-23 17:34:45,050 INFO L226 Difference]: Without dead ends: 12059 [2021-11-23 17:34:45,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:34:45,056 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 85 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:45,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 330 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 61 Unchecked, 0.0s Time] [2021-11-23 17:34:45,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12059 states. [2021-11-23 17:34:45,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12059 to 11985. [2021-11-23 17:34:45,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11985 states, 11984 states have (on average 1.2146194926568759) internal successors, (14556), 11984 states have internal predecessors, (14556), 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) [2021-11-23 17:34:46,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11985 states to 11985 states and 14556 transitions. [2021-11-23 17:34:46,007 INFO L78 Accepts]: Start accepts. Automaton has 11985 states and 14556 transitions. Word has length 139 [2021-11-23 17:34:46,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:46,007 INFO L470 AbstractCegarLoop]: Abstraction has 11985 states and 14556 transitions. [2021-11-23 17:34:46,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.666666666666668) internal successors, (130), 5 states have internal predecessors, (130), 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) [2021-11-23 17:34:46,007 INFO L276 IsEmpty]: Start isEmpty. Operand 11985 states and 14556 transitions. [2021-11-23 17:34:46,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:34:46,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:46,010 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:34:46,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:46,214 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:46,214 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:46,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:46,215 INFO L85 PathProgramCache]: Analyzing trace with hash 764330063, now seen corresponding path program 1 times [2021-11-23 17:34:46,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:46,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [345835703] [2021-11-23 17:34:46,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:46,216 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:46,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:46,217 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:46,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Waiting until timeout for monitored process [2021-11-23 17:34:46,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:46,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:34:46,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:48,780 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 43 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:48,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:49,232 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 43 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:49,233 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:49,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [345835703] [2021-11-23 17:34:49,233 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [345835703] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:49,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1801635124] [2021-11-23 17:34:49,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:49,233 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:49,233 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:49,234 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:49,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Waiting until timeout for monitored process [2021-11-23 17:34:49,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:49,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:34:49,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:52,496 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:52,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:54,735 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:54,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1801635124] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:54,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014920584] [2021-11-23 17:34:54,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:54,735 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:54,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:54,736 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:54,737 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2021-11-23 17:34:54,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:54,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:34:54,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:58,435 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:58,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:59,363 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:59,363 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014920584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:59,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:59,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 23, 22, 22, 21] total 84 [2021-11-23 17:34:59,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357774017] [2021-11-23 17:34:59,364 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:59,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-23 17:34:59,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:59,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-23 17:34:59,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=6675, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:34:59,365 INFO L87 Difference]: Start difference. First operand 11985 states and 14556 transitions. Second operand has 84 states, 84 states have (on average 7.380952380952381) internal successors, (620), 84 states have internal predecessors, (620), 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) [2021-11-23 17:35:04,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:04,543 INFO L93 Difference]: Finished difference Result 21934 states and 26776 transitions. [2021-11-23 17:35:04,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 17:35:04,544 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 7.380952380952381) internal successors, (620), 84 states have internal predecessors, (620), 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) Word has length 140 [2021-11-23 17:35:04,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:04,564 INFO L225 Difference]: With dead ends: 21934 [2021-11-23 17:35:04,564 INFO L226 Difference]: Without dead ends: 18959 [2021-11-23 17:35:04,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 769 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4026 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=671, Invalid=13135, Unknown=0, NotChecked=0, Total=13806 [2021-11-23 17:35:04,571 INFO L933 BasicCegarLoop]: 184 mSDtfsCounter, 317 mSDsluCounter, 6520 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 6704 SdHoareTripleChecker+Invalid, 877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 525 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:04,571 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 6704 Invalid, 877 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 338 Invalid, 0 Unknown, 525 Unchecked, 0.2s Time] [2021-11-23 17:35:04,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18959 states. [2021-11-23 17:35:05,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18959 to 12015. [2021-11-23 17:35:05,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12015 states, 12014 states have (on average 1.2145829865157316) internal successors, (14592), 12014 states have internal predecessors, (14592), 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) [2021-11-23 17:35:05,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12015 states to 12015 states and 14592 transitions. [2021-11-23 17:35:05,593 INFO L78 Accepts]: Start accepts. Automaton has 12015 states and 14592 transitions. Word has length 140 [2021-11-23 17:35:05,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:05,593 INFO L470 AbstractCegarLoop]: Abstraction has 12015 states and 14592 transitions. [2021-11-23 17:35:05,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 7.380952380952381) internal successors, (620), 84 states have internal predecessors, (620), 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) [2021-11-23 17:35:05,593 INFO L276 IsEmpty]: Start isEmpty. Operand 12015 states and 14592 transitions. [2021-11-23 17:35:05,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:35:05,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:05,596 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:05,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (122)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:05,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (121)] Ended with exit code 0 [2021-11-23 17:35:06,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Ended with exit code 0 [2021-11-23 17:35:06,197 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:06,197 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:06,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:06,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1879951761, now seen corresponding path program 1 times [2021-11-23 17:35:06,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:06,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [850711038] [2021-11-23 17:35:06,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:06,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:06,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:06,199 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:06,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Waiting until timeout for monitored process [2021-11-23 17:35:06,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:06,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:35:06,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:09,356 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:09,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:11,370 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:11,370 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:11,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [850711038] [2021-11-23 17:35:11,370 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [850711038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:11,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [316873180] [2021-11-23 17:35:11,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:11,370 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:11,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:11,371 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:11,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Waiting until timeout for monitored process [2021-11-23 17:35:11,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:11,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:35:11,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:15,585 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:15,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:18,459 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:18,459 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [316873180] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:18,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708346893] [2021-11-23 17:35:18,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:18,459 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:18,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:18,460 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:18,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2021-11-23 17:35:18,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:18,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:35:18,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:22,675 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:22,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:23,845 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:23,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708346893] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:23,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:35:23,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23, 22, 22, 21] total 103 [2021-11-23 17:35:23,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692182318] [2021-11-23 17:35:23,846 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:35:23,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-23 17:35:23,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:35:23,847 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-23 17:35:23,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=10114, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 17:35:23,848 INFO L87 Difference]: Start difference. First operand 12015 states and 14592 transitions. Second operand has 103 states, 103 states have (on average 6.145631067961165) internal successors, (633), 103 states have internal predecessors, (633), 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) [2021-11-23 17:35:31,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:35:31,120 INFO L93 Difference]: Finished difference Result 15634 states and 18952 transitions. [2021-11-23 17:35:31,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 17:35:31,121 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 6.145631067961165) internal successors, (633), 103 states have internal predecessors, (633), 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) Word has length 140 [2021-11-23 17:35:31,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:35:31,134 INFO L225 Difference]: With dead ends: 15634 [2021-11-23 17:35:31,134 INFO L226 Difference]: Without dead ends: 13490 [2021-11-23 17:35:31,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 899 GetRequests, 758 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5953 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=889, Invalid=19417, Unknown=0, NotChecked=0, Total=20306 [2021-11-23 17:35:31,138 INFO L933 BasicCegarLoop]: 125 mSDtfsCounter, 282 mSDsluCounter, 5978 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 282 SdHoareTripleChecker+Valid, 6103 SdHoareTripleChecker+Invalid, 924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 485 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:35:31,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [282 Valid, 6103 Invalid, 924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 425 Invalid, 0 Unknown, 485 Unchecked, 0.3s Time] [2021-11-23 17:35:31,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13490 states. [2021-11-23 17:35:32,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13490 to 12010. [2021-11-23 17:35:32,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12010 states, 12009 states have (on average 1.214505787326172) internal successors, (14585), 12009 states have internal predecessors, (14585), 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) [2021-11-23 17:35:32,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12010 states to 12010 states and 14585 transitions. [2021-11-23 17:35:32,134 INFO L78 Accepts]: Start accepts. Automaton has 12010 states and 14585 transitions. Word has length 140 [2021-11-23 17:35:32,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:35:32,135 INFO L470 AbstractCegarLoop]: Abstraction has 12010 states and 14585 transitions. [2021-11-23 17:35:32,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 6.145631067961165) internal successors, (633), 103 states have internal predecessors, (633), 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) [2021-11-23 17:35:32,135 INFO L276 IsEmpty]: Start isEmpty. Operand 12010 states and 14585 transitions. [2021-11-23 17:35:32,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:35:32,138 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:35:32,139 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:35:32,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:32,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (125)] Forceful destruction successful, exit code 0 [2021-11-23 17:35:32,546 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (124)] Ended with exit code 0 [2021-11-23 17:35:32,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:35:32,740 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:35:32,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:35:32,740 INFO L85 PathProgramCache]: Analyzing trace with hash -949655950, now seen corresponding path program 1 times [2021-11-23 17:35:32,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:35:32,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [660133397] [2021-11-23 17:35:32,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:32,740 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:35:32,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:35:32,741 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:35:32,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (127)] Waiting until timeout for monitored process [2021-11-23 17:35:32,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:32,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:35:32,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:40,507 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:40,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:44,610 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:44,611 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:35:44,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [660133397] [2021-11-23 17:35:44,611 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [660133397] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:44,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2120325842] [2021-11-23 17:35:44,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:44,611 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:35:44,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:35:44,612 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:35:44,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (128)] Waiting until timeout for monitored process [2021-11-23 17:35:44,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:44,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:35:44,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:35:49,924 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:49,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:35:51,559 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:35:51,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2120325842] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:35:51,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081036274] [2021-11-23 17:35:51,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:35:51,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:35:51,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:35:51,562 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:35:51,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2021-11-23 17:35:51,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:35:51,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 17:35:51,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:36:00,781 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 76 proven. 8 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:36:00,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:36:13,332 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:36:13,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081036274] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:36:13,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:36:13,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 22, 21, 29, 39] total 144 [2021-11-23 17:36:13,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287408652] [2021-11-23 17:36:13,334 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:36:13,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 144 states [2021-11-23 17:36:13,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:36:13,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2021-11-23 17:36:13,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1909, Invalid=18683, Unknown=0, NotChecked=0, Total=20592 [2021-11-23 17:36:13,336 INFO L87 Difference]: Start difference. First operand 12010 states and 14585 transitions. Second operand has 144 states, 144 states have (on average 4.520833333333333) internal successors, (651), 144 states have internal predecessors, (651), 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) [2021-11-23 17:36:58,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:36:58,760 INFO L93 Difference]: Finished difference Result 24980 states and 30150 transitions. [2021-11-23 17:36:58,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2021-11-23 17:36:58,761 INFO L78 Accepts]: Start accepts. Automaton has has 144 states, 144 states have (on average 4.520833333333333) internal successors, (651), 144 states have internal predecessors, (651), 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) Word has length 140 [2021-11-23 17:36:58,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:36:58,779 INFO L225 Difference]: With dead ends: 24980 [2021-11-23 17:36:58,779 INFO L226 Difference]: Without dead ends: 18743 [2021-11-23 17:36:58,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 911 GetRequests, 691 SyntacticMatches, 1 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18600 ImplicationChecksByTransitivity, 60.8s TimeCoverageRelationStatistics Valid=3700, Invalid=44920, Unknown=0, NotChecked=0, Total=48620 [2021-11-23 17:36:58,787 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 1195 mSDsluCounter, 7347 mSDsCounter, 0 mSdLazyCounter, 3520 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1195 SdHoareTripleChecker+Valid, 7503 SdHoareTripleChecker+Invalid, 4053 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 3520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 454 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:36:58,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1195 Valid, 7503 Invalid, 4053 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 3520 Invalid, 0 Unknown, 454 Unchecked, 6.1s Time] [2021-11-23 17:36:58,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18743 states. [2021-11-23 17:37:00,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18743 to 13585. [2021-11-23 17:37:00,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13585 states, 13584 states have (on average 1.2207744405182568) internal successors, (16583), 13584 states have internal predecessors, (16583), 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) [2021-11-23 17:37:00,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13585 states to 13585 states and 16583 transitions. [2021-11-23 17:37:00,298 INFO L78 Accepts]: Start accepts. Automaton has 13585 states and 16583 transitions. Word has length 140 [2021-11-23 17:37:00,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:00,298 INFO L470 AbstractCegarLoop]: Abstraction has 13585 states and 16583 transitions. [2021-11-23 17:37:00,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 144 states, 144 states have (on average 4.520833333333333) internal successors, (651), 144 states have internal predecessors, (651), 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) [2021-11-23 17:37:00,298 INFO L276 IsEmpty]: Start isEmpty. Operand 13585 states and 16583 transitions. [2021-11-23 17:37:00,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:37:00,301 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:00,302 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:00,306 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (128)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:00,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (127)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:00,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:00,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:00,907 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:00,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:00,907 INFO L85 PathProgramCache]: Analyzing trace with hash -1974576408, now seen corresponding path program 1 times [2021-11-23 17:37:00,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:00,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [465232487] [2021-11-23 17:37:00,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:00,907 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:00,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:00,909 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:00,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (130)] Waiting until timeout for monitored process [2021-11-23 17:37:00,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:00,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:00,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 58 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:02,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:02,807 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 58 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:02,807 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:02,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [465232487] [2021-11-23 17:37:02,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [465232487] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:02,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [511251442] [2021-11-23 17:37:02,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:02,808 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:02,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:02,809 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:02,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (131)] Waiting until timeout for monitored process [2021-11-23 17:37:02,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:02,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:02,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:04,547 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 58 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:04,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:05,019 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 58 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:05,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [511251442] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:05,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498523949] [2021-11-23 17:37:05,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:05,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:05,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:05,021 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:05,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2021-11-23 17:37:05,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:05,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:05,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:06,954 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 58 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:06,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:07,431 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 25 proven. 58 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:07,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498523949] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:07,432 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:07,432 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:37:07,432 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93937942] [2021-11-23 17:37:07,432 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:07,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:37:07,433 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:07,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:37:07,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:37:07,433 INFO L87 Difference]: Start difference. First operand 13585 states and 16583 transitions. Second operand has 16 states, 16 states have (on average 14.3125) internal successors, (229), 15 states have internal predecessors, (229), 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) [2021-11-23 17:37:09,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:09,056 INFO L93 Difference]: Finished difference Result 26276 states and 32222 transitions. [2021-11-23 17:37:09,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:37:09,057 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 14.3125) internal successors, (229), 15 states have internal predecessors, (229), 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) Word has length 140 [2021-11-23 17:37:09,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:09,072 INFO L225 Difference]: With dead ends: 26276 [2021-11-23 17:37:09,072 INFO L226 Difference]: Without dead ends: 15096 [2021-11-23 17:37:09,079 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 844 GetRequests, 822 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:37:09,080 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 144 mSDsluCounter, 791 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 902 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:09,080 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [144 Valid, 902 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 62 Invalid, 0 Unknown, 83 Unchecked, 0.0s Time] [2021-11-23 17:37:09,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15096 states. [2021-11-23 17:37:10,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15096 to 15044. [2021-11-23 17:37:10,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15044 states, 15043 states have (on average 1.2167120920029248) internal successors, (18303), 15043 states have internal predecessors, (18303), 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) [2021-11-23 17:37:10,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15044 states to 15044 states and 18303 transitions. [2021-11-23 17:37:10,697 INFO L78 Accepts]: Start accepts. Automaton has 15044 states and 18303 transitions. Word has length 140 [2021-11-23 17:37:10,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:10,698 INFO L470 AbstractCegarLoop]: Abstraction has 15044 states and 18303 transitions. [2021-11-23 17:37:10,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 14.3125) internal successors, (229), 15 states have internal predecessors, (229), 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) [2021-11-23 17:37:10,698 INFO L276 IsEmpty]: Start isEmpty. Operand 15044 states and 18303 transitions. [2021-11-23 17:37:10,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-23 17:37:10,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:10,701 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:10,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Ended with exit code 0 [2021-11-23 17:37:10,909 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (130)] Ended with exit code 0 [2021-11-23 17:37:11,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (131)] Ended with exit code 0 [2021-11-23 17:37:11,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:11,302 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:11,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:11,303 INFO L85 PathProgramCache]: Analyzing trace with hash -1437913862, now seen corresponding path program 1 times [2021-11-23 17:37:11,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:11,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [202218972] [2021-11-23 17:37:11,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:11,303 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:11,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:11,304 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:11,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Waiting until timeout for monitored process [2021-11-23 17:37:11,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:11,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:37:11,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:12,645 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:37:12,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:13,288 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 78 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 17:37:13,288 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:13,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [202218972] [2021-11-23 17:37:13,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [202218972] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:13,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1657559004] [2021-11-23 17:37:13,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:13,289 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:13,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:13,290 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:13,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Waiting until timeout for monitored process [2021-11-23 17:37:13,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:13,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:13,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:15,020 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:15,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:15,590 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:15,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1657559004] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:15,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187547854] [2021-11-23 17:37:15,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:15,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:15,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:15,592 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:15,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2021-11-23 17:37:15,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:15,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:37:15,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:17,204 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:17,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:17,591 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 26 proven. 57 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 17:37:17,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187547854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:17,591 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:17,592 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 8, 8, 8, 8] total 31 [2021-11-23 17:37:17,592 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068409115] [2021-11-23 17:37:17,592 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:17,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 17:37:17,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:17,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 17:37:17,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=885, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:37:17,593 INFO L87 Difference]: Start difference. First operand 15044 states and 18303 transitions. Second operand has 32 states, 32 states have (on average 13.375) internal successors, (428), 31 states have internal predecessors, (428), 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) [2021-11-23 17:37:20,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:20,264 INFO L93 Difference]: Finished difference Result 24590 states and 30051 transitions. [2021-11-23 17:37:20,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 17:37:20,265 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 13.375) internal successors, (428), 31 states have internal predecessors, (428), 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) Word has length 140 [2021-11-23 17:37:20,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:20,284 INFO L225 Difference]: With dead ends: 24590 [2021-11-23 17:37:20,284 INFO L226 Difference]: Without dead ends: 18127 [2021-11-23 17:37:20,289 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 859 GetRequests, 809 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=297, Invalid=2153, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 17:37:20,289 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 289 mSDsluCounter, 1953 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 2082 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:20,290 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [289 Valid, 2082 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 127 Invalid, 0 Unknown, 139 Unchecked, 0.1s Time] [2021-11-23 17:37:20,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18127 states. [2021-11-23 17:37:22,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18127 to 17848. [2021-11-23 17:37:22,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17848 states, 17847 states have (on average 1.215050148484339) internal successors, (21685), 17847 states have internal predecessors, (21685), 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) [2021-11-23 17:37:22,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17848 states to 17848 states and 21685 transitions. [2021-11-23 17:37:22,281 INFO L78 Accepts]: Start accepts. Automaton has 17848 states and 21685 transitions. Word has length 140 [2021-11-23 17:37:22,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:22,281 INFO L470 AbstractCegarLoop]: Abstraction has 17848 states and 21685 transitions. [2021-11-23 17:37:22,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 13.375) internal successors, (428), 31 states have internal predecessors, (428), 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) [2021-11-23 17:37:22,281 INFO L276 IsEmpty]: Start isEmpty. Operand 17848 states and 21685 transitions. [2021-11-23 17:37:22,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:37:22,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:22,284 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:22,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:22,486 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (134)] Ended with exit code 0 [2021-11-23 17:37:22,705 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Ended with exit code 0 [2021-11-23 17:37:22,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:22,885 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:22,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:22,886 INFO L85 PathProgramCache]: Analyzing trace with hash -244741671, now seen corresponding path program 1 times [2021-11-23 17:37:22,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:22,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1588669556] [2021-11-23 17:37:22,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:22,886 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:22,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:22,887 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:22,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Waiting until timeout for monitored process [2021-11-23 17:37:22,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:22,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:37:22,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:25,640 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 43 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:25,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:26,116 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 43 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:26,117 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:37:26,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1588669556] [2021-11-23 17:37:26,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1588669556] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:26,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1809714054] [2021-11-23 17:37:26,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:26,117 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:37:26,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:37:26,118 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:37:26,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Waiting until timeout for monitored process [2021-11-23 17:37:26,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:26,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:37:26,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:33,037 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:33,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:35,021 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:35,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1809714054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:35,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741397348] [2021-11-23 17:37:35,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:35,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:35,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:37:35,022 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:37:35,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2021-11-23 17:37:35,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:35,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:37:35,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:37:39,760 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:39,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:37:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:37:42,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741397348] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:37:42,828 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:37:42,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 20, 17, 22, 21] total 95 [2021-11-23 17:37:42,829 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398541280] [2021-11-23 17:37:42,829 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:37:42,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2021-11-23 17:37:42,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:37:42,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-11-23 17:37:42,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=8610, Unknown=0, NotChecked=0, Total=8930 [2021-11-23 17:37:42,831 INFO L87 Difference]: Start difference. First operand 17848 states and 21685 transitions. Second operand has 95 states, 95 states have (on average 7.810526315789474) internal successors, (742), 95 states have internal predecessors, (742), 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) [2021-11-23 17:37:55,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:37:55,931 INFO L93 Difference]: Finished difference Result 27542 states and 33449 transitions. [2021-11-23 17:37:55,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-23 17:37:55,931 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 7.810526315789474) internal successors, (742), 95 states have internal predecessors, (742), 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) Word has length 141 [2021-11-23 17:37:55,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:37:55,952 INFO L225 Difference]: With dead ends: 27542 [2021-11-23 17:37:55,952 INFO L226 Difference]: Without dead ends: 22337 [2021-11-23 17:37:55,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 770 SyntacticMatches, 6 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4592 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=839, Invalid=16717, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 17:37:55,957 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 575 mSDsluCounter, 9358 mSDsCounter, 0 mSdLazyCounter, 885 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 575 SdHoareTripleChecker+Valid, 9529 SdHoareTripleChecker+Invalid, 2627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 885 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1714 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:37:55,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [575 Valid, 9529 Invalid, 2627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 885 Invalid, 0 Unknown, 1714 Unchecked, 0.7s Time] [2021-11-23 17:37:55,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22337 states. [2021-11-23 17:37:57,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22337 to 17969. [2021-11-23 17:37:57,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17969 states, 17968 states have (on average 1.2136576135351735) internal successors, (21807), 17968 states have internal predecessors, (21807), 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) [2021-11-23 17:37:57,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17969 states to 17969 states and 21807 transitions. [2021-11-23 17:37:57,894 INFO L78 Accepts]: Start accepts. Automaton has 17969 states and 21807 transitions. Word has length 141 [2021-11-23 17:37:57,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:37:57,895 INFO L470 AbstractCegarLoop]: Abstraction has 17969 states and 21807 transitions. [2021-11-23 17:37:57,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 7.810526315789474) internal successors, (742), 95 states have internal predecessors, (742), 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) [2021-11-23 17:37:57,895 INFO L276 IsEmpty]: Start isEmpty. Operand 17969 states and 21807 transitions. [2021-11-23 17:37:57,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:37:57,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:37:57,899 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:37:57,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (137)] Forceful destruction successful, exit code 0 [2021-11-23 17:37:58,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (136)] Ended with exit code 0 [2021-11-23 17:37:58,319 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Ended with exit code 0 [2021-11-23 17:37:58,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:37:58,500 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:37:58,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:37:58,500 INFO L85 PathProgramCache]: Analyzing trace with hash 1405943801, now seen corresponding path program 1 times [2021-11-23 17:37:58,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:37:58,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [171957606] [2021-11-23 17:37:58,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:37:58,501 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:37:58,501 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:37:58,502 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:37:58,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Waiting until timeout for monitored process [2021-11-23 17:37:58,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:37:58,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:37:58,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:01,762 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:01,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:03,683 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:03,683 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:38:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [171957606] [2021-11-23 17:38:03,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [171957606] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:03,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1469782774] [2021-11-23 17:38:03,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:03,684 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:38:03,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:38:03,685 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:38:03,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Waiting until timeout for monitored process [2021-11-23 17:38:03,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:03,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:38:03,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:15,688 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 25 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:15,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:20,429 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:20,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1469782774] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:20,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661781586] [2021-11-23 17:38:20,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:38:20,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:38:20,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:38:20,431 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:38:20,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2021-11-23 17:38:20,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:38:20,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:38:20,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:38:26,280 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:26,281 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:38:30,332 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:38:30,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661781586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:38:30,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:38:30,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 28, 25, 22, 21] total 130 [2021-11-23 17:38:30,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463591460] [2021-11-23 17:38:30,333 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:38:30,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 130 states [2021-11-23 17:38:30,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:38:30,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2021-11-23 17:38:30,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=831, Invalid=15939, Unknown=0, NotChecked=0, Total=16770 [2021-11-23 17:38:30,336 INFO L87 Difference]: Start difference. First operand 17969 states and 21807 transitions. Second operand has 130 states, 130 states have (on average 5.876923076923077) internal successors, (764), 130 states have internal predecessors, (764), 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) [2021-11-23 17:39:23,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:23,783 INFO L93 Difference]: Finished difference Result 38372 states and 46210 transitions. [2021-11-23 17:39:23,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 176 states. [2021-11-23 17:39:23,784 INFO L78 Accepts]: Start accepts. Automaton has has 130 states, 130 states have (on average 5.876923076923077) internal successors, (764), 130 states have internal predecessors, (764), 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) Word has length 141 [2021-11-23 17:39:23,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:23,823 INFO L225 Difference]: With dead ends: 38372 [2021-11-23 17:39:23,823 INFO L226 Difference]: Without dead ends: 31756 [2021-11-23 17:39:23,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1013 GetRequests, 719 SyntacticMatches, 12 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 25980 ImplicationChecksByTransitivity, 58.7s TimeCoverageRelationStatistics Valid=4111, Invalid=76261, Unknown=0, NotChecked=0, Total=80372 [2021-11-23 17:39:23,838 INFO L933 BasicCegarLoop]: 247 mSDtfsCounter, 2548 mSDsluCounter, 14215 mSDsCounter, 0 mSdLazyCounter, 6045 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2548 SdHoareTripleChecker+Valid, 14462 SdHoareTripleChecker+Invalid, 7435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 6045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1239 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:23,839 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2548 Valid, 14462 Invalid, 7435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 6045 Invalid, 0 Unknown, 1239 Unchecked, 6.4s Time] [2021-11-23 17:39:23,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31756 states. [2021-11-23 17:39:26,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31756 to 18561. [2021-11-23 17:39:26,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18561 states, 18560 states have (on average 1.2130387931034483) internal successors, (22514), 18560 states have internal predecessors, (22514), 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) [2021-11-23 17:39:26,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18561 states to 18561 states and 22514 transitions. [2021-11-23 17:39:26,315 INFO L78 Accepts]: Start accepts. Automaton has 18561 states and 22514 transitions. Word has length 141 [2021-11-23 17:39:26,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:26,316 INFO L470 AbstractCegarLoop]: Abstraction has 18561 states and 22514 transitions. [2021-11-23 17:39:26,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 130 states, 130 states have (on average 5.876923076923077) internal successors, (764), 130 states have internal predecessors, (764), 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) [2021-11-23 17:39:26,316 INFO L276 IsEmpty]: Start isEmpty. Operand 18561 states and 22514 transitions. [2021-11-23 17:39:26,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:39:26,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:26,319 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:26,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (140)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:26,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:26,728 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (139)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:26,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:39:26,921 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:26,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:26,922 INFO L85 PathProgramCache]: Analyzing trace with hash -1657612430, now seen corresponding path program 1 times [2021-11-23 17:39:26,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:26,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [740059645] [2021-11-23 17:39:26,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:26,922 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:26,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:26,923 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:26,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (142)] Waiting until timeout for monitored process [2021-11-23 17:39:27,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:27,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:39:27,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:27,947 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 67 proven. 40 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:39:27,947 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:28,383 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 80 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:39:28,384 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:28,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [740059645] [2021-11-23 17:39:28,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [740059645] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:28,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [487704021] [2021-11-23 17:39:28,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:28,385 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:28,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:28,388 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:28,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (143)] Waiting until timeout for monitored process [2021-11-23 17:39:28,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:28,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:39:28,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:35,585 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 44 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:35,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:36,732 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 47 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:36,732 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [487704021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:36,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232510871] [2021-11-23 17:39:36,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:36,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:39:36,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:39:36,735 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:39:36,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Waiting until timeout for monitored process [2021-11-23 17:39:36,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:36,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 17:39:36,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:37,536 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 69 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:39:37,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 80 proven. 27 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:39:37,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [232510871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:37,811 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:39:37,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 25, 17, 12, 11] total 64 [2021-11-23 17:39:37,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968873036] [2021-11-23 17:39:37,811 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:39:37,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-23 17:39:37,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:39:37,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-23 17:39:37,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=511, Invalid=3521, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 17:39:37,813 INFO L87 Difference]: Start difference. First operand 18561 states and 22514 transitions. Second operand has 64 states, 64 states have (on average 7.765625) internal successors, (497), 64 states have internal predecessors, (497), 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) [2021-11-23 17:39:44,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:39:44,187 INFO L93 Difference]: Finished difference Result 51959 states and 62956 transitions. [2021-11-23 17:39:44,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-11-23 17:39:44,188 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 7.765625) internal successors, (497), 64 states have internal predecessors, (497), 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) Word has length 141 [2021-11-23 17:39:44,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:39:44,230 INFO L225 Difference]: With dead ends: 51959 [2021-11-23 17:39:44,230 INFO L226 Difference]: Without dead ends: 41305 [2021-11-23 17:39:44,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 789 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=843, Invalid=5637, Unknown=0, NotChecked=0, Total=6480 [2021-11-23 17:39:44,241 INFO L933 BasicCegarLoop]: 260 mSDtfsCounter, 1875 mSDsluCounter, 7038 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1875 SdHoareTripleChecker+Valid, 7298 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 276 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:39:44,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1875 Valid, 7298 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 529 Invalid, 0 Unknown, 276 Unchecked, 0.4s Time] [2021-11-23 17:39:44,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41305 states. [2021-11-23 17:39:47,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41305 to 27164. [2021-11-23 17:39:47,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27164 states, 27163 states have (on average 1.2057210175606523) internal successors, (32751), 27163 states have internal predecessors, (32751), 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) [2021-11-23 17:39:47,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27164 states to 27164 states and 32751 transitions. [2021-11-23 17:39:47,744 INFO L78 Accepts]: Start accepts. Automaton has 27164 states and 32751 transitions. Word has length 141 [2021-11-23 17:39:47,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:39:47,745 INFO L470 AbstractCegarLoop]: Abstraction has 27164 states and 32751 transitions. [2021-11-23 17:39:47,745 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 7.765625) internal successors, (497), 64 states have internal predecessors, (497), 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) [2021-11-23 17:39:47,745 INFO L276 IsEmpty]: Start isEmpty. Operand 27164 states and 32751 transitions. [2021-11-23 17:39:47,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:39:47,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:39:47,751 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:39:47,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:47,961 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (142)] Ended with exit code 0 [2021-11-23 17:39:48,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (143)] Forceful destruction successful, exit code 0 [2021-11-23 17:39:48,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:48,355 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:39:48,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:39:48,355 INFO L85 PathProgramCache]: Analyzing trace with hash -6926958, now seen corresponding path program 1 times [2021-11-23 17:39:48,355 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:39:48,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [105642215] [2021-11-23 17:39:48,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:48,356 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:39:48,356 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:39:48,356 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:39:48,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (145)] Waiting until timeout for monitored process [2021-11-23 17:39:48,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:48,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 17:39:48,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:39:51,449 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 26 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:51,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:39:52,120 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 26 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:39:52,120 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:39:52,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [105642215] [2021-11-23 17:39:52,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [105642215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:39:52,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [792945162] [2021-11-23 17:39:52,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:39:52,120 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:39:52,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:39:52,121 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:39:52,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (146)] Waiting until timeout for monitored process [2021-11-23 17:39:52,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:39:52,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:39:52,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 26 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:01,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:03,172 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 26 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:03,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [792945162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:03,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364445363] [2021-11-23 17:40:03,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:03,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:03,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:03,173 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:03,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Waiting until timeout for monitored process [2021-11-23 17:40:03,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:03,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-23 17:40:03,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:07,339 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:07,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:10,613 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:10,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364445363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:10,614 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:40:10,614 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 20, 17, 22, 21] total 93 [2021-11-23 17:40:10,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147271241] [2021-11-23 17:40:10,614 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:40:10,615 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2021-11-23 17:40:10,615 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:40:10,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2021-11-23 17:40:10,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=8210, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 17:40:10,616 INFO L87 Difference]: Start difference. First operand 27164 states and 32751 transitions. Second operand has 93 states, 93 states have (on average 7.591397849462366) internal successors, (706), 93 states have internal predecessors, (706), 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) [2021-11-23 17:40:20,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:40:20,577 INFO L93 Difference]: Finished difference Result 41730 states and 50213 transitions. [2021-11-23 17:40:20,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 17:40:20,577 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 7.591397849462366) internal successors, (706), 93 states have internal predecessors, (706), 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) Word has length 141 [2021-11-23 17:40:20,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:40:20,609 INFO L225 Difference]: With dead ends: 41730 [2021-11-23 17:40:20,610 INFO L226 Difference]: Without dead ends: 32206 [2021-11-23 17:40:20,617 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 765 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3848 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=748, Invalid=15254, Unknown=0, NotChecked=0, Total=16002 [2021-11-23 17:40:20,617 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 344 mSDsluCounter, 7651 mSDsCounter, 0 mSdLazyCounter, 642 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 7828 SdHoareTripleChecker+Invalid, 1164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 497 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:40:20,618 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [344 Valid, 7828 Invalid, 1164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 642 Invalid, 0 Unknown, 497 Unchecked, 0.6s Time] [2021-11-23 17:40:20,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32206 states. [2021-11-23 17:40:24,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32206 to 27079. [2021-11-23 17:40:24,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27079 states, 27078 states have (on average 1.2056651155919935) internal successors, (32647), 27078 states have internal predecessors, (32647), 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) [2021-11-23 17:40:24,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27079 states to 27079 states and 32647 transitions. [2021-11-23 17:40:24,351 INFO L78 Accepts]: Start accepts. Automaton has 27079 states and 32647 transitions. Word has length 141 [2021-11-23 17:40:24,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:40:24,352 INFO L470 AbstractCegarLoop]: Abstraction has 27079 states and 32647 transitions. [2021-11-23 17:40:24,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 7.591397849462366) internal successors, (706), 93 states have internal predecessors, (706), 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) [2021-11-23 17:40:24,352 INFO L276 IsEmpty]: Start isEmpty. Operand 27079 states and 32647 transitions. [2021-11-23 17:40:24,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-23 17:40:24,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:40:24,356 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:40:24,377 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Ended with exit code 0 [2021-11-23 17:40:24,558 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (146)] Forceful destruction successful, exit code 0 [2021-11-23 17:40:24,763 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (145)] Ended with exit code 0 [2021-11-23 17:40:24,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:40:24,957 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:40:24,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:40:24,957 INFO L85 PathProgramCache]: Analyzing trace with hash 923368853, now seen corresponding path program 1 times [2021-11-23 17:40:24,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:40:24,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2143301113] [2021-11-23 17:40:24,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:24,958 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:40:24,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:40:24,958 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:40:24,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (148)] Waiting until timeout for monitored process [2021-11-23 17:40:25,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:25,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:40:25,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:33,393 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:33,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:37,491 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:37,491 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:40:37,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2143301113] [2021-11-23 17:40:37,491 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2143301113] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:37,491 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [338786903] [2021-11-23 17:40:37,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:37,491 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:40:37,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:40:37,492 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:40:37,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (149)] Waiting until timeout for monitored process [2021-11-23 17:40:37,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:37,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:40:37,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:42,507 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:42,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:40:44,360 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:44,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [338786903] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:40:44,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63219861] [2021-11-23 17:40:44,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:40:44,360 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:40:44,360 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:40:44,361 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:40:44,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_19048ba8-5a39-43a0-9388-368d15175ec5/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Waiting until timeout for monitored process [2021-11-23 17:40:44,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:40:44,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 17:40:44,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:40:59,749 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 35 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:40:59,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:41:05,953 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:41:05,953 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63219861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:41:05,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:41:05,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 22, 21, 37, 31] total 125 [2021-11-23 17:41:05,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630902633] [2021-11-23 17:41:05,954 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:41:05,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-23 17:41:05,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:41:05,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-23 17:41:05,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1567, Invalid=13933, Unknown=0, NotChecked=0, Total=15500 [2021-11-23 17:41:05,956 INFO L87 Difference]: Start difference. First operand 27079 states and 32647 transitions. Second operand has 125 states, 125 states have (on average 4.488) internal successors, (561), 125 states have internal predecessors, (561), 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)