./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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 afac0863a681e4712e7bffaf04a415cd693c6153e1fe439605f11a4c250fdcc1 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:22:23,881 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:22:23,884 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:22:23,929 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:22:23,930 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:22:23,931 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:22:23,934 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:22:23,936 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:22:23,939 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:22:23,941 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:22:23,942 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:22:23,944 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:22:23,944 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:22:23,945 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:22:23,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:22:23,949 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:22:23,950 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:22:23,952 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:22:23,954 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:22:23,958 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:22:23,960 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:22:23,968 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:22:23,969 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:22:23,970 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:22:23,974 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:22:23,975 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:22:23,975 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:22:23,977 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:22:23,977 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:22:23,979 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:22:23,979 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:22:23,980 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:22:23,981 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:22:23,982 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:22:23,983 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:22:23,984 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:22:23,985 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:22:23,985 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:22:23,986 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:22:23,987 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:22:23,988 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:22:23,989 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 17:22:24,015 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:22:24,016 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:22:24,016 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:22:24,016 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:22:24,017 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:22:24,017 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:22:24,018 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:22:24,018 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:22:24,018 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:22:24,018 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 17:22:24,019 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:22:24,019 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:22:24,019 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 17:22:24,019 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 17:22:24,020 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:22:24,020 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 17:22:24,020 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 17:22:24,020 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 17:22:24,021 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:22:24,021 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:22:24,021 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 17:22:24,022 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:22:24,022 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:22:24,022 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:22:24,022 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:22:24,022 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:22:24,023 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:22:24,023 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:22:24,023 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:22:24,023 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:22:24,024 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:22:24,024 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:22:24,024 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:24,024 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:22:24,025 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:22:24,025 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:22:24,025 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 17:22:24,025 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 17:22:24,025 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:22:24,026 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:22:24,026 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:22:24,026 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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afac0863a681e4712e7bffaf04a415cd693c6153e1fe439605f11a4c250fdcc1 [2021-11-23 17:22:24,310 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:22:24,331 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:22:24,334 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:22:24,336 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:22:24,336 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:22:24,338 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 17:22:24,396 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/3ef22faae/bd597595280447b8a81bb4e3a6783221/FLAGd6584c9d9 [2021-11-23 17:22:24,874 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:22:24,874 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 17:22:24,885 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/3ef22faae/bd597595280447b8a81bb4e3a6783221/FLAGd6584c9d9 [2021-11-23 17:22:25,240 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/3ef22faae/bd597595280447b8a81bb4e3a6783221 [2021-11-23 17:22:25,246 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:22:25,248 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:22:25,252 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:25,253 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:22:25,256 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:22:25,258 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,260 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4df1c1e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25, skipping insertion in model container [2021-11-23 17:22:25,261 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,269 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:22:25,322 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:22:25,584 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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4069,4082] [2021-11-23 17:22:25,614 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:25,625 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:22:25,665 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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4069,4082] [2021-11-23 17:22:25,698 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:25,737 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:22:25,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25 WrapperNode [2021-11-23 17:22:25,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:25,739 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:25,741 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:22:25,741 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:22:25,749 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,781 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,809 INFO L137 Inliner]: procedures = 22, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 271 [2021-11-23 17:22:25,813 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:25,814 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:22:25,814 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:22:25,814 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:22:25,824 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,824 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,830 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,831 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,837 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,857 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,872 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,876 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:22:25,878 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:22:25,878 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:22:25,879 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:22:25,880 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:25" (1/1) ... [2021-11-23 17:22:25,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:25,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:25,934 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:22:25,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:22:25,981 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:22:25,981 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 17:22:25,981 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:22:25,981 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:22:26,111 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:22:26,113 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:22:26,431 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:22:26,476 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 17:22:26,481 INFO L158 Benchmark]: Toolchain (without parser) took 1231.91ms. Allocated memory was 81.8MB in the beginning and 117.4MB in the end (delta: 35.7MB). Free memory was 44.6MB in the beginning and 68.1MB in the end (delta: -23.5MB). Peak memory consumption was 10.1MB. Max. memory is 16.1GB. [2021-11-23 17:22:26,482 INFO L158 Benchmark]: CDTParser took 0.30ms. Allocated memory is still 81.8MB. Free memory is still 61.1MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:22:26,483 INFO L158 Benchmark]: CACSL2BoogieTranslator took 486.31ms. Allocated memory was 81.8MB in the beginning and 117.4MB in the end (delta: 35.7MB). Free memory was 44.4MB in the beginning and 90.3MB in the end (delta: -45.9MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. [2021-11-23 17:22:26,484 INFO L158 Benchmark]: Boogie Procedure Inliner took 73.76ms. Allocated memory is still 117.4MB. Free memory was 90.3MB in the beginning and 88.0MB in the end (delta: 2.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 17:22:26,485 INFO L158 Benchmark]: Boogie Preprocessor took 62.72ms. Allocated memory is still 117.4MB. Free memory was 88.0MB in the beginning and 86.9MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 17:22:26,486 INFO L158 Benchmark]: RCFGBuilder took 601.06ms. Allocated memory is still 117.4MB. Free memory was 86.8MB in the beginning and 68.1MB in the end (delta: 18.7MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. [2021-11-23 17:22:26,490 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30ms. Allocated memory is still 81.8MB. Free memory is still 61.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 486.31ms. Allocated memory was 81.8MB in the beginning and 117.4MB in the end (delta: 35.7MB). Free memory was 44.4MB in the beginning and 90.3MB in the end (delta: -45.9MB). Peak memory consumption was 7.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 73.76ms. Allocated memory is still 117.4MB. Free memory was 90.3MB in the beginning and 88.0MB in the end (delta: 2.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 62.72ms. Allocated memory is still 117.4MB. Free memory was 88.0MB in the beginning and 86.9MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 601.06ms. Allocated memory is still 117.4MB. Free memory was 86.8MB in the beginning and 68.1MB in the end (delta: 18.7MB). Peak memory consumption was 18.9MB. 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 17:22:26,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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 afac0863a681e4712e7bffaf04a415cd693c6153e1fe439605f11a4c250fdcc1 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 17:22:29,108 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 17:22:29,110 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 17:22:29,141 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 17:22:29,141 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 17:22:29,143 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 17:22:29,144 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 17:22:29,147 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 17:22:29,149 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 17:22:29,150 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 17:22:29,151 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 17:22:29,153 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 17:22:29,153 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 17:22:29,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 17:22:29,156 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 17:22:29,158 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 17:22:29,159 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 17:22:29,160 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 17:22:29,162 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 17:22:29,165 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 17:22:29,166 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 17:22:29,171 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 17:22:29,174 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 17:22:29,176 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 17:22:29,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 17:22:29,189 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 17:22:29,189 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 17:22:29,194 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 17:22:29,195 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 17:22:29,197 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 17:22:29,197 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 17:22:29,198 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 17:22:29,200 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 17:22:29,201 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 17:22:29,203 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 17:22:29,204 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 17:22:29,205 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 17:22:29,205 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 17:22:29,205 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 17:22:29,207 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 17:22:29,208 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 17:22:29,212 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 17:22:29,251 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 17:22:29,251 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 17:22:29,252 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 17:22:29,252 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 17:22:29,253 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 17:22:29,253 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 17:22:29,253 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 17:22:29,253 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 17:22:29,254 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 17:22:29,254 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 17:22:29,254 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 17:22:29,254 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 17:22:29,255 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 17:22:29,255 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 17:22:29,256 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 17:22:29,256 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 17:22:29,256 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 17:22:29,256 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 17:22:29,257 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 17:22:29,257 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 17:22:29,257 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 17:22:29,257 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 17:22:29,257 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 17:22:29,258 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 17:22:29,258 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 17:22:29,258 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 17:22:29,258 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 17:22:29,259 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 17:22:29,259 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 17:22:29,259 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:29,259 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 17:22:29,260 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 17:22:29,260 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 17:22:29,260 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 17:22:29,260 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:29,261 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 17:22:29,261 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 17:22:29,261 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 17:22:29,261 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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> afac0863a681e4712e7bffaf04a415cd693c6153e1fe439605f11a4c250fdcc1 [2021-11-23 17:22:29,679 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 17:22:29,715 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 17:22:29,719 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 17:22:29,720 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 17:22:29,721 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 17:22:29,722 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 17:22:29,795 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/07bb5dfe3/eab9902d062644049d9e94d3594973a3/FLAG5a65d7e48 [2021-11-23 17:22:30,440 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 17:22:30,441 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 17:22:30,455 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/07bb5dfe3/eab9902d062644049d9e94d3594973a3/FLAG5a65d7e48 [2021-11-23 17:22:30,757 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/data/07bb5dfe3/eab9902d062644049d9e94d3594973a3 [2021-11-23 17:22:30,762 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 17:22:30,765 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 17:22:30,767 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:30,767 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 17:22:30,771 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 17:22:30,773 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:30" (1/1) ... [2021-11-23 17:22:30,776 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b7ca098 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:30, skipping insertion in model container [2021-11-23 17:22:30,776 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 05:22:30" (1/1) ... [2021-11-23 17:22:30,784 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 17:22:30,846 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 17:22:31,115 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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4069,4082] [2021-11-23 17:22:31,156 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:31,182 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 17:22:31,253 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_dffbb826-d75d-41bf-a64f-3bca6348d5ee/sv-benchmarks/c/seq-mthreaded-reduced/pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c[4069,4082] [2021-11-23 17:22:31,266 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 17:22:31,295 INFO L208 MainTranslator]: Completed translation [2021-11-23 17:22:31,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31 WrapperNode [2021-11-23 17:22:31,296 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 17:22:31,312 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:31,313 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 17:22:31,313 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 17:22:31,321 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,332 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,361 INFO L137 Inliner]: procedures = 22, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 261 [2021-11-23 17:22:31,361 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 17:22:31,362 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 17:22:31,362 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 17:22:31,363 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 17:22:31,373 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,374 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,391 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,402 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,411 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,431 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,434 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 17:22:31,436 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 17:22:31,436 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 17:22:31,436 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 17:22:31,437 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (1/1) ... [2021-11-23 17:22:31,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 17:22:31,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:31,470 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 17:22:31,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 17:22:31,520 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 17:22:31,520 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 17:22:31,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 17:22:31,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 17:22:31,644 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 17:22:31,646 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 17:22:32,082 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 17:22:32,091 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 17:22:32,091 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 17:22:32,093 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:22:32 BoogieIcfgContainer [2021-11-23 17:22:32,094 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 17:22:32,096 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 17:22:32,096 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 17:22:32,101 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 17:22:32,102 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 05:22:30" (1/3) ... [2021-11-23 17:22:32,103 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@469f209b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:22:32, skipping insertion in model container [2021-11-23 17:22:32,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 05:22:31" (2/3) ... [2021-11-23 17:22:32,103 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@469f209b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 05:22:32, skipping insertion in model container [2021-11-23 17:22:32,103 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 05:22:32" (3/3) ... [2021-11-23 17:22:32,105 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_lcr.3.1.ufo.BOUNDED-6.pals.c.v+cfa-reducer.c [2021-11-23 17:22:32,112 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 17:22:32,113 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 17:22:32,185 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 17:22:32,195 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 17:22:32,196 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 17:22:32,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 62 states, 60 states have (on average 1.7166666666666666) internal successors, (103), 61 states have internal predecessors, (103), 0 states have call successors, (0), 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 17:22:32,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 17:22:32,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:32,230 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] [2021-11-23 17:22:32,231 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:32,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:32,238 INFO L85 PathProgramCache]: Analyzing trace with hash -1007825277, now seen corresponding path program 1 times [2021-11-23 17:22:32,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:32,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1442914570] [2021-11-23 17:22:32,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:32,256 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:32,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:32,264 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:32,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 17:22:32,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:32,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:32,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:32,650 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 17:22:32,651 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:32,652 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:32,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1442914570] [2021-11-23 17:22:32,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1442914570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:32,653 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:32,653 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:32,655 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168911886] [2021-11-23 17:22:32,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:32,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:32,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:32,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:32,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:32,715 INFO L87 Difference]: Start difference. First operand has 62 states, 60 states have (on average 1.7166666666666666) internal successors, (103), 61 states have internal predecessors, (103), 0 states have call successors, (0), 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 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 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 17:22:32,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:32,806 INFO L93 Difference]: Finished difference Result 140 states and 224 transitions. [2021-11-23 17:22:32,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:32,809 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 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 36 [2021-11-23 17:22:32,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:32,820 INFO L225 Difference]: With dead ends: 140 [2021-11-23 17:22:32,820 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 17:22:32,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 34 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 17:22:32,827 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 68 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:32,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 215 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:32,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 17:22:32,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 89. [2021-11-23 17:22:32,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.4772727272727273) internal successors, (130), 88 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 17:22:32,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 130 transitions. [2021-11-23 17:22:32,874 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 130 transitions. Word has length 36 [2021-11-23 17:22:32,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:32,875 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 130 transitions. [2021-11-23 17:22:32,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 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 17:22:32,875 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 130 transitions. [2021-11-23 17:22:32,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 17:22:32,877 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:32,877 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] [2021-11-23 17:22:32,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:33,089 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:33,090 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:33,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:33,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1176817218, now seen corresponding path program 1 times [2021-11-23 17:22:33,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:33,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1253481862] [2021-11-23 17:22:33,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:33,094 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:33,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:33,095 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:33,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 17:22:33,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:33,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:33,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:33,351 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 17:22:33,351 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:33,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:33,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1253481862] [2021-11-23 17:22:33,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1253481862] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:33,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:33,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:33,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99861527] [2021-11-23 17:22:33,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:33,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:33,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:33,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:33,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:33,366 INFO L87 Difference]: Start difference. First operand 89 states and 130 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 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 17:22:33,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:33,430 INFO L93 Difference]: Finished difference Result 213 states and 326 transitions. [2021-11-23 17:22:33,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:33,432 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 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 37 [2021-11-23 17:22:33,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:33,440 INFO L225 Difference]: With dead ends: 213 [2021-11-23 17:22:33,441 INFO L226 Difference]: Without dead ends: 143 [2021-11-23 17:22:33,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 35 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 17:22:33,444 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 48 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 182 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 17:22:33,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 182 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:33,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-23 17:22:33,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2021-11-23 17:22:33,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.5142857142857142) internal successors, (212), 140 states have internal predecessors, (212), 0 states have call successors, (0), 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 17:22:33,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 212 transitions. [2021-11-23 17:22:33,496 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 212 transitions. Word has length 37 [2021-11-23 17:22:33,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:33,497 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 212 transitions. [2021-11-23 17:22:33,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 0 states have call successors, (0), 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 17:22:33,497 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 212 transitions. [2021-11-23 17:22:33,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 17:22:33,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:33,500 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] [2021-11-23 17:22:33,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:33,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:33,713 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:33,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:33,714 INFO L85 PathProgramCache]: Analyzing trace with hash 761408425, now seen corresponding path program 1 times [2021-11-23 17:22:33,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:33,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1952643799] [2021-11-23 17:22:33,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:33,716 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:33,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:33,717 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:33,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 17:22:33,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:33,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:33,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:34,560 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 17:22:34,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:34,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:34,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1952643799] [2021-11-23 17:22:34,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1952643799] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:34,565 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:34,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:22:34,565 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147001865] [2021-11-23 17:22:34,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:34,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:34,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:34,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:34,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:34,571 INFO L87 Difference]: Start difference. First operand 141 states and 212 transitions. Second operand has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 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 17:22:34,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:34,668 INFO L93 Difference]: Finished difference Result 271 states and 416 transitions. [2021-11-23 17:22:34,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:22:34,670 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 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 38 [2021-11-23 17:22:34,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:34,672 INFO L225 Difference]: With dead ends: 271 [2021-11-23 17:22:34,675 INFO L226 Difference]: Without dead ends: 149 [2021-11-23 17:22:34,676 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:22:34,678 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 12 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:34,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 193 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 31 Unchecked, 0.0s Time] [2021-11-23 17:22:34,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-11-23 17:22:34,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-11-23 17:22:34,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.5) internal successors, (222), 148 states have internal predecessors, (222), 0 states have call successors, (0), 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 17:22:34,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 222 transitions. [2021-11-23 17:22:34,708 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 222 transitions. Word has length 38 [2021-11-23 17:22:34,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:34,709 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 222 transitions. [2021-11-23 17:22:34,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.6) internal successors, (38), 4 states have internal predecessors, (38), 0 states have call successors, (0), 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 17:22:34,709 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 222 transitions. [2021-11-23 17:22:34,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 17:22:34,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:34,713 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] [2021-11-23 17:22:34,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:34,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:34,932 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:34,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:34,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1533272078, now seen corresponding path program 1 times [2021-11-23 17:22:34,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:34,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1564677199] [2021-11-23 17:22:34,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:34,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:34,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:34,936 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:34,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 17:22:35,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:35,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:35,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:35,111 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 17:22:35,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:35,111 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:35,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1564677199] [2021-11-23 17:22:35,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1564677199] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:35,112 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:35,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:35,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687661994] [2021-11-23 17:22:35,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:35,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:35,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:35,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:35,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:35,115 INFO L87 Difference]: Start difference. First operand 149 states and 222 transitions. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 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 17:22:35,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:35,153 INFO L93 Difference]: Finished difference Result 361 states and 556 transitions. [2021-11-23 17:22:35,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:35,154 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 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 38 [2021-11-23 17:22:35,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:35,157 INFO L225 Difference]: With dead ends: 361 [2021-11-23 17:22:35,157 INFO L226 Difference]: Without dead ends: 239 [2021-11-23 17:22:35,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 36 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 17:22:35,160 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 43 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 178 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 17:22:35,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 178 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:35,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-23 17:22:35,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 237. [2021-11-23 17:22:35,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.5169491525423728) internal successors, (358), 236 states have internal predecessors, (358), 0 states have call successors, (0), 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 17:22:35,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 358 transitions. [2021-11-23 17:22:35,189 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 358 transitions. Word has length 38 [2021-11-23 17:22:35,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:35,190 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 358 transitions. [2021-11-23 17:22:35,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 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 17:22:35,190 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 358 transitions. [2021-11-23 17:22:35,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 17:22:35,191 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:35,191 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] [2021-11-23 17:22:35,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:35,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:35,404 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:35,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:35,404 INFO L85 PathProgramCache]: Analyzing trace with hash 172600953, now seen corresponding path program 1 times [2021-11-23 17:22:35,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:35,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [934878617] [2021-11-23 17:22:35,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:35,406 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:35,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:35,410 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:35,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 17:22:35,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:35,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:35,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:35,880 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 17:22:35,880 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:35,880 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:35,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [934878617] [2021-11-23 17:22:35,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [934878617] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:35,881 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:35,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:35,881 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334139845] [2021-11-23 17:22:35,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:35,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:35,882 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:35,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:35,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:35,883 INFO L87 Difference]: Start difference. First operand 237 states and 358 transitions. Second operand has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 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 17:22:36,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:36,037 INFO L93 Difference]: Finished difference Result 1077 states and 1674 transitions. [2021-11-23 17:22:36,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:36,038 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 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 39 [2021-11-23 17:22:36,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:36,044 INFO L225 Difference]: With dead ends: 1077 [2021-11-23 17:22:36,045 INFO L226 Difference]: Without dead ends: 867 [2021-11-23 17:22:36,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:36,047 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 261 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 261 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:36,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [261 Valid, 284 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:36,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2021-11-23 17:22:36,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 653. [2021-11-23 17:22:36,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 653 states, 652 states have (on average 1.51840490797546) internal successors, (990), 652 states have internal predecessors, (990), 0 states have call successors, (0), 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 17:22:36,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 653 states to 653 states and 990 transitions. [2021-11-23 17:22:36,125 INFO L78 Accepts]: Start accepts. Automaton has 653 states and 990 transitions. Word has length 39 [2021-11-23 17:22:36,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:36,126 INFO L470 AbstractCegarLoop]: Abstraction has 653 states and 990 transitions. [2021-11-23 17:22:36,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.8) internal successors, (39), 5 states have internal predecessors, (39), 0 states have call successors, (0), 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 17:22:36,126 INFO L276 IsEmpty]: Start isEmpty. Operand 653 states and 990 transitions. [2021-11-23 17:22:36,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 17:22:36,127 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:36,128 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] [2021-11-23 17:22:36,144 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2021-11-23 17:22:36,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:36,341 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:36,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:36,342 INFO L85 PathProgramCache]: Analyzing trace with hash 1738935381, now seen corresponding path program 1 times [2021-11-23 17:22:36,343 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:36,343 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1410913983] [2021-11-23 17:22:36,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:36,343 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:36,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:36,348 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:36,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 17:22:36,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:36,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:36,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:36,566 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 17:22:36,566 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:36,566 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:36,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1410913983] [2021-11-23 17:22:36,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1410913983] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:36,567 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:36,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:36,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035016025] [2021-11-23 17:22:36,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:36,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:36,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:36,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:36,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:36,569 INFO L87 Difference]: Start difference. First operand 653 states and 990 transitions. Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 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 17:22:36,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:36,652 INFO L93 Difference]: Finished difference Result 1577 states and 2404 transitions. [2021-11-23 17:22:36,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:36,652 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 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 41 [2021-11-23 17:22:36,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:36,659 INFO L225 Difference]: With dead ends: 1577 [2021-11-23 17:22:36,660 INFO L226 Difference]: Without dead ends: 951 [2021-11-23 17:22:36,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 39 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 17:22:36,662 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 34 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:36,663 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 155 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:36,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 951 states. [2021-11-23 17:22:36,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 951 to 949. [2021-11-23 17:22:36,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 949 states, 948 states have (on average 1.5) internal successors, (1422), 948 states have internal predecessors, (1422), 0 states have call successors, (0), 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 17:22:36,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 949 states to 949 states and 1422 transitions. [2021-11-23 17:22:36,748 INFO L78 Accepts]: Start accepts. Automaton has 949 states and 1422 transitions. Word has length 41 [2021-11-23 17:22:36,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:36,749 INFO L470 AbstractCegarLoop]: Abstraction has 949 states and 1422 transitions. [2021-11-23 17:22:36,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 0 states have call successors, (0), 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 17:22:36,749 INFO L276 IsEmpty]: Start isEmpty. Operand 949 states and 1422 transitions. [2021-11-23 17:22:36,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 17:22:36,750 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:36,750 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] [2021-11-23 17:22:36,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:36,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:36,963 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:36,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:36,964 INFO L85 PathProgramCache]: Analyzing trace with hash -1278405158, now seen corresponding path program 1 times [2021-11-23 17:22:36,964 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:36,964 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1948937686] [2021-11-23 17:22:36,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:36,965 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:36,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:36,966 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:36,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-23 17:22:37,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:37,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 17:22:37,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:37,164 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 17:22:37,164 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:37,165 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:37,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1948937686] [2021-11-23 17:22:37,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1948937686] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:37,165 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:37,165 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:22:37,166 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103613568] [2021-11-23 17:22:37,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:37,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 17:22:37,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:37,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 17:22:37,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 17:22:37,170 INFO L87 Difference]: Start difference. First operand 949 states and 1422 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 0 states have call successors, (0), 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 17:22:37,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:37,336 INFO L93 Difference]: Finished difference Result 1769 states and 2633 transitions. [2021-11-23 17:22:37,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:37,337 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 0 states have call successors, (0), 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 42 [2021-11-23 17:22:37,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:37,353 INFO L225 Difference]: With dead ends: 1769 [2021-11-23 17:22:37,354 INFO L226 Difference]: Without dead ends: 1767 [2021-11-23 17:22:37,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:37,356 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 110 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:37,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 265 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:37,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1767 states. [2021-11-23 17:22:37,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1767 to 1005. [2021-11-23 17:22:37,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1005 states, 1004 states have (on average 1.4681274900398407) internal successors, (1474), 1004 states have internal predecessors, (1474), 0 states have call successors, (0), 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 17:22:37,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1005 states to 1005 states and 1474 transitions. [2021-11-23 17:22:37,458 INFO L78 Accepts]: Start accepts. Automaton has 1005 states and 1474 transitions. Word has length 42 [2021-11-23 17:22:37,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:37,460 INFO L470 AbstractCegarLoop]: Abstraction has 1005 states and 1474 transitions. [2021-11-23 17:22:37,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 0 states have call successors, (0), 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 17:22:37,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1005 states and 1474 transitions. [2021-11-23 17:22:37,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:22:37,466 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:37,466 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:37,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:37,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:37,680 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:37,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:37,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1616122195, now seen corresponding path program 1 times [2021-11-23 17:22:37,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:37,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [743626648] [2021-11-23 17:22:37,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:37,682 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:37,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:37,683 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:37,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 17:22:37,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:37,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:37,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:38,699 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:38,699 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:39,266 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:39,266 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:39,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [743626648] [2021-11-23 17:22:39,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [743626648] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:39,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [845841551] [2021-11-23 17:22:39,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:39,268 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:39,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:39,273 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:39,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 17:22:39,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:39,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:39,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:40,031 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:40,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:40,457 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:40,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [845841551] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:40,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [66482428] [2021-11-23 17:22:40,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:40,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:40,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:40,465 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:40,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 17:22:40,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:40,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:40,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:41,095 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:41,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:41,461 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:41,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [66482428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:41,462 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:41,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:22:41,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714719299] [2021-11-23 17:22:41,463 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:41,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:22:41,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:41,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:22:41,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:22:41,468 INFO L87 Difference]: Start difference. First operand 1005 states and 1474 transitions. Second operand has 16 states, 16 states have (on average 6.5) internal successors, (104), 15 states have internal predecessors, (104), 0 states have call successors, (0), 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 17:22:41,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:41,689 INFO L93 Difference]: Finished difference Result 1697 states and 2507 transitions. [2021-11-23 17:22:41,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:22:41,690 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.5) internal successors, (104), 15 states have internal predecessors, (104), 0 states have call successors, (0), 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 60 [2021-11-23 17:22:41,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:41,697 INFO L225 Difference]: With dead ends: 1697 [2021-11-23 17:22:41,697 INFO L226 Difference]: Without dead ends: 1023 [2021-11-23 17:22:41,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:22:41,700 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 70 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 571 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:41,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 571 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 70 Unchecked, 0.0s Time] [2021-11-23 17:22:41,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1023 states. [2021-11-23 17:22:41,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1023 to 1022. [2021-11-23 17:22:41,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1022 states, 1021 states have (on average 1.464250734573947) internal successors, (1495), 1021 states have internal predecessors, (1495), 0 states have call successors, (0), 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 17:22:41,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1022 states to 1022 states and 1495 transitions. [2021-11-23 17:22:41,780 INFO L78 Accepts]: Start accepts. Automaton has 1022 states and 1495 transitions. Word has length 60 [2021-11-23 17:22:41,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:41,780 INFO L470 AbstractCegarLoop]: Abstraction has 1022 states and 1495 transitions. [2021-11-23 17:22:41,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.5) internal successors, (104), 15 states have internal predecessors, (104), 0 states have call successors, (0), 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 17:22:41,781 INFO L276 IsEmpty]: Start isEmpty. Operand 1022 states and 1495 transitions. [2021-11-23 17:22:41,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:22:41,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:41,782 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:41,812 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2021-11-23 17:22:41,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:42,205 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:42,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:42,397 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:42,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:42,397 INFO L85 PathProgramCache]: Analyzing trace with hash 1912167623, now seen corresponding path program 1 times [2021-11-23 17:22:42,397 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:42,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2055490192] [2021-11-23 17:22:42,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:42,398 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:42,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:42,399 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:42,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 17:22:42,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:42,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:42,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:43,463 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:43,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:43,794 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:43,794 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:43,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2055490192] [2021-11-23 17:22:43,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2055490192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:43,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [484346979] [2021-11-23 17:22:43,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:43,795 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:43,795 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:43,796 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:43,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 17:22:43,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:43,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:43,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:44,799 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:44,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:45,018 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:45,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [484346979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:45,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647997208] [2021-11-23 17:22:45,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:45,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:45,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:45,021 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:45,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 17:22:45,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:45,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:45,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:46,042 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:46,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:46,245 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:46,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647997208] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:46,246 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:46,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:22:46,246 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653242648] [2021-11-23 17:22:46,246 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:46,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:22:46,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:46,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:22:46,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:22:46,250 INFO L87 Difference]: Start difference. First operand 1022 states and 1495 transitions. Second operand has 16 states, 16 states have (on average 6.875) internal successors, (110), 15 states have internal predecessors, (110), 0 states have call successors, (0), 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 17:22:46,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:46,459 INFO L93 Difference]: Finished difference Result 1715 states and 2532 transitions. [2021-11-23 17:22:46,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 17:22:46,460 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 6.875) internal successors, (110), 15 states have internal predecessors, (110), 0 states have call successors, (0), 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 60 [2021-11-23 17:22:46,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:46,466 INFO L225 Difference]: With dead ends: 1715 [2021-11-23 17:22:46,467 INFO L226 Difference]: Without dead ends: 1041 [2021-11-23 17:22:46,468 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:22:46,470 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 74 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 595 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:46,471 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 595 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 87 Unchecked, 0.0s Time] [2021-11-23 17:22:46,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1041 states. [2021-11-23 17:22:46,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1041 to 1032. [2021-11-23 17:22:46,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1032 states, 1031 states have (on average 1.463627546071775) internal successors, (1509), 1031 states have internal predecessors, (1509), 0 states have call successors, (0), 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 17:22:46,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1509 transitions. [2021-11-23 17:22:46,551 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1509 transitions. Word has length 60 [2021-11-23 17:22:46,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:46,552 INFO L470 AbstractCegarLoop]: Abstraction has 1032 states and 1509 transitions. [2021-11-23 17:22:46,552 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 6.875) internal successors, (110), 15 states have internal predecessors, (110), 0 states have call successors, (0), 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 17:22:46,553 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1509 transitions. [2021-11-23 17:22:46,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:22:46,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:46,555 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:46,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:46,802 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:46,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:47,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:47,168 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:47,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:47,169 INFO L85 PathProgramCache]: Analyzing trace with hash -878113000, now seen corresponding path program 1 times [2021-11-23 17:22:47,169 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:47,169 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1777445873] [2021-11-23 17:22:47,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:47,170 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:47,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:47,171 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:47,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 17:22:47,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:47,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:47,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:47,547 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:47,548 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:47,548 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:47,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1777445873] [2021-11-23 17:22:47,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1777445873] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:47,548 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:47,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:22:47,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132232565] [2021-11-23 17:22:47,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:47,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:47,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:47,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:47,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:47,550 INFO L87 Difference]: Start difference. First operand 1032 states and 1509 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 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 17:22:47,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:47,639 INFO L93 Difference]: Finished difference Result 2010 states and 2954 transitions. [2021-11-23 17:22:47,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:22:47,640 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 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 60 [2021-11-23 17:22:47,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:47,648 INFO L225 Difference]: With dead ends: 2010 [2021-11-23 17:22:47,648 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:22:47,650 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:22:47,651 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 14 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 31 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:47,651 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 167 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 31 Unchecked, 0.0s Time] [2021-11-23 17:22:47,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:22:47,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 1032. [2021-11-23 17:22:47,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1032 states, 1031 states have (on average 1.4626576139670222) internal successors, (1508), 1031 states have internal predecessors, (1508), 0 states have call successors, (0), 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 17:22:47,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1508 transitions. [2021-11-23 17:22:47,719 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1508 transitions. Word has length 60 [2021-11-23 17:22:47,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:47,720 INFO L470 AbstractCegarLoop]: Abstraction has 1032 states and 1508 transitions. [2021-11-23 17:22:47,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 4 states have internal predecessors, (58), 0 states have call successors, (0), 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 17:22:47,720 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1508 transitions. [2021-11-23 17:22:47,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:22:47,722 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:47,722 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:47,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:47,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:47,943 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:47,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:47,943 INFO L85 PathProgramCache]: Analyzing trace with hash -558222797, now seen corresponding path program 1 times [2021-11-23 17:22:47,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:47,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1013873392] [2021-11-23 17:22:47,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:47,944 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:47,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:47,945 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:47,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-23 17:22:48,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:48,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:48,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:48,316 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:22:48,316 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:48,316 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:48,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1013873392] [2021-11-23 17:22:48,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1013873392] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:48,317 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:48,317 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:22:48,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434414059] [2021-11-23 17:22:48,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:48,319 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:48,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:48,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:48,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:48,321 INFO L87 Difference]: Start difference. First operand 1032 states and 1508 transitions. Second operand has 5 states, 5 states have (on average 11.2) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 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 17:22:48,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:48,404 INFO L93 Difference]: Finished difference Result 2010 states and 2953 transitions. [2021-11-23 17:22:48,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:22:48,404 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 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 60 [2021-11-23 17:22:48,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:48,412 INFO L225 Difference]: With dead ends: 2010 [2021-11-23 17:22:48,412 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:22:48,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:22:48,418 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 25 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:48,418 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 155 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2 Invalid, 0 Unknown, 32 Unchecked, 0.0s Time] [2021-11-23 17:22:48,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:22:48,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 1032. [2021-11-23 17:22:48,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1032 states, 1031 states have (on average 1.4616876818622697) internal successors, (1507), 1031 states have internal predecessors, (1507), 0 states have call successors, (0), 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 17:22:48,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1507 transitions. [2021-11-23 17:22:48,503 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1507 transitions. Word has length 60 [2021-11-23 17:22:48,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:48,503 INFO L470 AbstractCegarLoop]: Abstraction has 1032 states and 1507 transitions. [2021-11-23 17:22:48,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.2) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 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 17:22:48,504 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1507 transitions. [2021-11-23 17:22:48,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:22:48,505 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:48,505 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:48,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:48,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:48,718 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:48,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:48,719 INFO L85 PathProgramCache]: Analyzing trace with hash 2098261170, now seen corresponding path program 1 times [2021-11-23 17:22:48,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:48,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [114162904] [2021-11-23 17:22:48,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:48,720 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:48,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:48,721 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:48,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 17:22:48,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:48,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:48,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:48,924 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:22:48,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:48,925 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:48,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [114162904] [2021-11-23 17:22:48,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [114162904] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:48,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:48,925 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:48,925 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075183217] [2021-11-23 17:22:48,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:48,926 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:48,926 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:48,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:48,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:48,927 INFO L87 Difference]: Start difference. First operand 1032 states and 1507 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 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 17:22:49,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:49,057 INFO L93 Difference]: Finished difference Result 2010 states and 2952 transitions. [2021-11-23 17:22:49,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:49,058 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 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 61 [2021-11-23 17:22:49,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:49,065 INFO L225 Difference]: With dead ends: 2010 [2021-11-23 17:22:49,066 INFO L226 Difference]: Without dead ends: 1032 [2021-11-23 17:22:49,068 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 17:22:49,068 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 52 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:49,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 90 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:49,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1032 states. [2021-11-23 17:22:49,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1032 to 1032. [2021-11-23 17:22:49,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1032 states, 1031 states have (on average 1.443258971871969) internal successors, (1488), 1031 states have internal predecessors, (1488), 0 states have call successors, (0), 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 17:22:49,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1488 transitions. [2021-11-23 17:22:49,143 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1488 transitions. Word has length 61 [2021-11-23 17:22:49,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:49,143 INFO L470 AbstractCegarLoop]: Abstraction has 1032 states and 1488 transitions. [2021-11-23 17:22:49,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 0 states have call successors, (0), 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 17:22:49,144 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1488 transitions. [2021-11-23 17:22:49,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:22:49,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:49,145 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] [2021-11-23 17:22:49,157 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:49,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:49,357 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:49,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:49,357 INFO L85 PathProgramCache]: Analyzing trace with hash 1662233234, now seen corresponding path program 1 times [2021-11-23 17:22:49,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:49,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1502262430] [2021-11-23 17:22:49,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:49,358 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:49,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:49,359 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:49,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 17:22:49,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:49,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:49,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:49,561 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:49,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:49,561 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:49,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1502262430] [2021-11-23 17:22:49,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1502262430] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:49,562 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:49,562 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:49,562 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188447159] [2021-11-23 17:22:49,562 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:49,563 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:49,563 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:49,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:49,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:49,564 INFO L87 Difference]: Start difference. First operand 1032 states and 1488 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 17:22:49,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:49,632 INFO L93 Difference]: Finished difference Result 1731 states and 2513 transitions. [2021-11-23 17:22:49,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:49,633 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 17:22:49,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:49,638 INFO L225 Difference]: With dead ends: 1731 [2021-11-23 17:22:49,639 INFO L226 Difference]: Without dead ends: 753 [2021-11-23 17:22:49,641 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 17:22:49,642 INFO L933 BasicCegarLoop]: 105 mSDtfsCounter, 36 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 173 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 17:22:49,642 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 173 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:49,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 753 states. [2021-11-23 17:22:49,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 753 to 747. [2021-11-23 17:22:49,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 746 states have (on average 1.4302949061662198) internal successors, (1067), 746 states have internal predecessors, (1067), 0 states have call successors, (0), 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 17:22:49,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 1067 transitions. [2021-11-23 17:22:49,703 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 1067 transitions. Word has length 61 [2021-11-23 17:22:49,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:49,704 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 1067 transitions. [2021-11-23 17:22:49,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 17:22:49,705 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 1067 transitions. [2021-11-23 17:22:49,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:22:49,712 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:49,712 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:49,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:49,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:49,924 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:49,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:49,924 INFO L85 PathProgramCache]: Analyzing trace with hash 1509662092, now seen corresponding path program 1 times [2021-11-23 17:22:49,925 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:49,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [574672732] [2021-11-23 17:22:49,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:49,925 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:49,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:49,926 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:49,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 17:22:50,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:50,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:50,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:50,918 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:50,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:51,317 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:51,317 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:51,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [574672732] [2021-11-23 17:22:51,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [574672732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:51,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [859410119] [2021-11-23 17:22:51,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:51,319 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:22:51,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:22:51,320 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:22:51,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 17:22:51,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:51,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:51,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:52,244 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:52,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:52,506 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:52,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [859410119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:52,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297231035] [2021-11-23 17:22:52,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:52,507 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:52,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:22:52,508 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:22:52,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 17:22:52,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:52,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:22:52,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:53,338 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:53,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:22:53,616 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:53,617 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297231035] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:22:53,617 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:22:53,617 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:22:53,617 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326129426] [2021-11-23 17:22:53,617 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:22:53,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:22:53,619 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:53,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:22:53,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:22:53,620 INFO L87 Difference]: Start difference. First operand 747 states and 1067 transitions. Second operand has 16 states, 16 states have (on average 7.25) internal successors, (116), 15 states have internal predecessors, (116), 0 states have call successors, (0), 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 17:22:53,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:53,817 INFO L93 Difference]: Finished difference Result 1472 states and 2118 transitions. [2021-11-23 17:22:53,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:22:53,818 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 7.25) internal successors, (116), 15 states have internal predecessors, (116), 0 states have call successors, (0), 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 61 [2021-11-23 17:22:53,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:53,824 INFO L225 Difference]: With dead ends: 1472 [2021-11-23 17:22:53,824 INFO L226 Difference]: Without dead ends: 798 [2021-11-23 17:22:53,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 346 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:22:53,827 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 76 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 565 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 87 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:53,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 565 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 111 Invalid, 0 Unknown, 87 Unchecked, 0.1s Time] [2021-11-23 17:22:53,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 798 states. [2021-11-23 17:22:53,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 798 to 759. [2021-11-23 17:22:53,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 759 states, 758 states have (on average 1.4313984168865435) internal successors, (1085), 758 states have internal predecessors, (1085), 0 states have call successors, (0), 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 17:22:53,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 759 states to 759 states and 1085 transitions. [2021-11-23 17:22:53,884 INFO L78 Accepts]: Start accepts. Automaton has 759 states and 1085 transitions. Word has length 61 [2021-11-23 17:22:53,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:53,885 INFO L470 AbstractCegarLoop]: Abstraction has 759 states and 1085 transitions. [2021-11-23 17:22:53,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 7.25) internal successors, (116), 15 states have internal predecessors, (116), 0 states have call successors, (0), 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 17:22:53,885 INFO L276 IsEmpty]: Start isEmpty. Operand 759 states and 1085 transitions. [2021-11-23 17:22:53,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:22:53,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:53,887 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] [2021-11-23 17:22:53,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:54,097 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:54,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:54,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:22:54,490 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:54,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:54,490 INFO L85 PathProgramCache]: Analyzing trace with hash 2082434500, now seen corresponding path program 1 times [2021-11-23 17:22:54,491 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:54,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385390784] [2021-11-23 17:22:54,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:54,491 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:54,491 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:54,493 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:54,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-23 17:22:54,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:54,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:54,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:22:54,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:54,669 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:54,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385390784] [2021-11-23 17:22:54,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385390784] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:54,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:54,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:54,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977708044] [2021-11-23 17:22:54,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:54,670 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:54,670 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:54,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:54,671 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:54,671 INFO L87 Difference]: Start difference. First operand 759 states and 1085 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 17:22:54,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:54,714 INFO L93 Difference]: Finished difference Result 1099 states and 1579 transitions. [2021-11-23 17:22:54,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:54,715 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 61 [2021-11-23 17:22:54,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:54,718 INFO L225 Difference]: With dead ends: 1099 [2021-11-23 17:22:54,718 INFO L226 Difference]: Without dead ends: 425 [2021-11-23 17:22:54,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 17:22:54,720 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 29 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 158 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 17:22:54,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 158 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:54,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2021-11-23 17:22:54,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 423. [2021-11-23 17:22:54,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 1.386255924170616) internal successors, (585), 422 states have internal predecessors, (585), 0 states have call successors, (0), 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 17:22:54,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 585 transitions. [2021-11-23 17:22:54,757 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 585 transitions. Word has length 61 [2021-11-23 17:22:54,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:54,758 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 585 transitions. [2021-11-23 17:22:54,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 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 17:22:54,758 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 585 transitions. [2021-11-23 17:22:54,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:22:54,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:54,759 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:54,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:54,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:54,971 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:54,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:54,971 INFO L85 PathProgramCache]: Analyzing trace with hash 966626727, now seen corresponding path program 1 times [2021-11-23 17:22:54,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:54,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1294452853] [2021-11-23 17:22:54,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:54,972 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:54,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:54,974 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:55,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 17:22:55,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:55,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:55,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:55,160 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:55,160 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:55,161 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:55,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1294452853] [2021-11-23 17:22:55,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1294452853] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:55,161 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:55,161 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:55,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273655909] [2021-11-23 17:22:55,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:55,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:55,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:55,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:55,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:55,163 INFO L87 Difference]: Start difference. First operand 423 states and 585 transitions. Second operand has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 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 17:22:55,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:55,231 INFO L93 Difference]: Finished difference Result 768 states and 1079 transitions. [2021-11-23 17:22:55,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:55,231 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 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 61 [2021-11-23 17:22:55,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:55,234 INFO L225 Difference]: With dead ends: 768 [2021-11-23 17:22:55,235 INFO L226 Difference]: Without dead ends: 423 [2021-11-23 17:22:55,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 17:22:55,236 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 46 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 74 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 17:22:55,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 74 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:22:55,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2021-11-23 17:22:55,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 423. [2021-11-23 17:22:55,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 1.367298578199052) internal successors, (577), 422 states have internal predecessors, (577), 0 states have call successors, (0), 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 17:22:55,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 577 transitions. [2021-11-23 17:22:55,281 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 577 transitions. Word has length 61 [2021-11-23 17:22:55,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:55,282 INFO L470 AbstractCegarLoop]: Abstraction has 423 states and 577 transitions. [2021-11-23 17:22:55,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.666666666666668) internal successors, (59), 3 states have internal predecessors, (59), 0 states have call successors, (0), 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 17:22:55,282 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 577 transitions. [2021-11-23 17:22:55,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 17:22:55,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:55,283 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:55,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (23)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:55,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:55,496 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:55,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:55,497 INFO L85 PathProgramCache]: Analyzing trace with hash -711386898, now seen corresponding path program 1 times [2021-11-23 17:22:55,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:55,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385889294] [2021-11-23 17:22:55,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:55,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:55,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:55,501 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:55,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 17:22:55,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:55,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:22:55,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:55,692 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:22:55,693 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:55,693 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:55,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385889294] [2021-11-23 17:22:55,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385889294] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:55,694 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:55,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:22:55,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071375467] [2021-11-23 17:22:55,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:55,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:22:55,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:55,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:22:55,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:22:55,697 INFO L87 Difference]: Start difference. First operand 423 states and 577 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 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 17:22:55,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:55,789 INFO L93 Difference]: Finished difference Result 761 states and 1058 transitions. [2021-11-23 17:22:55,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:22:55,789 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 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 61 [2021-11-23 17:22:55,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:55,792 INFO L225 Difference]: With dead ends: 761 [2021-11-23 17:22:55,792 INFO L226 Difference]: Without dead ends: 404 [2021-11-23 17:22:55,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 59 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 17:22:55,794 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 49 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:55,795 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 95 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:55,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-11-23 17:22:55,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 404. [2021-11-23 17:22:55,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 403 states have (on average 1.3622828784119108) internal successors, (549), 403 states have internal predecessors, (549), 0 states have call successors, (0), 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 17:22:55,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 549 transitions. [2021-11-23 17:22:55,836 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 549 transitions. Word has length 61 [2021-11-23 17:22:55,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:55,836 INFO L470 AbstractCegarLoop]: Abstraction has 404 states and 549 transitions. [2021-11-23 17:22:55,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 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 17:22:55,836 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 549 transitions. [2021-11-23 17:22:55,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:22:55,840 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:55,840 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:55,852 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Ended with exit code 0 [2021-11-23 17:22:56,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:56,052 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:56,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:56,052 INFO L85 PathProgramCache]: Analyzing trace with hash -998035781, now seen corresponding path program 1 times [2021-11-23 17:22:56,053 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:56,053 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1473586514] [2021-11-23 17:22:56,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:56,053 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:56,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:56,054 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:56,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 17:22:56,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:56,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:56,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:56,440 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:22:56,440 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:56,440 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:56,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1473586514] [2021-11-23 17:22:56,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1473586514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:56,440 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:56,440 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:56,440 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877455534] [2021-11-23 17:22:56,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:56,441 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:56,441 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:56,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:56,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:56,442 INFO L87 Difference]: Start difference. First operand 404 states and 549 transitions. Second operand has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 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 17:22:56,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:56,560 INFO L93 Difference]: Finished difference Result 864 states and 1194 transitions. [2021-11-23 17:22:56,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:56,561 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 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 62 [2021-11-23 17:22:56,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:56,567 INFO L225 Difference]: With dead ends: 864 [2021-11-23 17:22:56,567 INFO L226 Difference]: Without dead ends: 750 [2021-11-23 17:22:56,568 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:56,569 INFO L933 BasicCegarLoop]: 136 mSDtfsCounter, 173 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:56,569 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 338 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:56,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 750 states. [2021-11-23 17:22:56,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 750 to 632. [2021-11-23 17:22:56,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 632 states, 631 states have (on average 1.3534072900158478) internal successors, (854), 631 states have internal predecessors, (854), 0 states have call successors, (0), 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 17:22:56,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 632 states to 632 states and 854 transitions. [2021-11-23 17:22:56,627 INFO L78 Accepts]: Start accepts. Automaton has 632 states and 854 transitions. Word has length 62 [2021-11-23 17:22:56,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:56,627 INFO L470 AbstractCegarLoop]: Abstraction has 632 states and 854 transitions. [2021-11-23 17:22:56,627 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.0) internal successors, (60), 5 states have internal predecessors, (60), 0 states have call successors, (0), 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 17:22:56,628 INFO L276 IsEmpty]: Start isEmpty. Operand 632 states and 854 transitions. [2021-11-23 17:22:56,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:22:56,629 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:56,629 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:56,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:56,839 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:56,840 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:56,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:56,840 INFO L85 PathProgramCache]: Analyzing trace with hash 2018077342, now seen corresponding path program 1 times [2021-11-23 17:22:56,841 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:56,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [24513074] [2021-11-23 17:22:56,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:56,841 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:56,841 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:56,842 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:56,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-23 17:22:56,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:56,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:56,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:57,213 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:22:57,214 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:57,214 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:57,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [24513074] [2021-11-23 17:22:57,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [24513074] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:57,214 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:57,215 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:57,215 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353731283] [2021-11-23 17:22:57,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:57,215 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:57,216 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:57,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:57,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:57,217 INFO L87 Difference]: Start difference. First operand 632 states and 854 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 0 states have call successors, (0), 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 17:22:57,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:57,324 INFO L93 Difference]: Finished difference Result 976 states and 1344 transitions. [2021-11-23 17:22:57,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:57,325 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 0 states have call successors, (0), 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 62 [2021-11-23 17:22:57,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:57,329 INFO L225 Difference]: With dead ends: 976 [2021-11-23 17:22:57,329 INFO L226 Difference]: Without dead ends: 638 [2021-11-23 17:22:57,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:57,331 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 192 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:57,331 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 335 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:57,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-11-23 17:22:57,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 520. [2021-11-23 17:22:57,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 520 states, 519 states have (on average 1.3333333333333333) internal successors, (692), 519 states have internal predecessors, (692), 0 states have call successors, (0), 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 17:22:57,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 692 transitions. [2021-11-23 17:22:57,384 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 692 transitions. Word has length 62 [2021-11-23 17:22:57,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:57,384 INFO L470 AbstractCegarLoop]: Abstraction has 520 states and 692 transitions. [2021-11-23 17:22:57,385 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 0 states have call successors, (0), 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 17:22:57,385 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 692 transitions. [2021-11-23 17:22:57,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 17:22:57,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:57,386 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:57,404 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-23 17:22:57,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:57,600 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:57,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:57,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1984788030, now seen corresponding path program 1 times [2021-11-23 17:22:57,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:57,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2105291521] [2021-11-23 17:22:57,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:57,602 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:57,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:57,603 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:57,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 17:22:57,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:57,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:22:57,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:22:57,979 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:22:57,979 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:22:57,979 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:22:57,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2105291521] [2021-11-23 17:22:57,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2105291521] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:22:57,979 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:22:57,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 17:22:57,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205081090] [2021-11-23 17:22:57,980 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:22:57,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:22:57,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:22:57,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:22:57,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:57,982 INFO L87 Difference]: Start difference. First operand 520 states and 692 transitions. Second operand has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 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 17:22:58,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:22:58,078 INFO L93 Difference]: Finished difference Result 868 states and 1187 transitions. [2021-11-23 17:22:58,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 17:22:58,079 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 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 62 [2021-11-23 17:22:58,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:22:58,084 INFO L225 Difference]: With dead ends: 868 [2021-11-23 17:22:58,084 INFO L226 Difference]: Without dead ends: 754 [2021-11-23 17:22:58,085 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:22:58,085 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 166 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 371 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:22:58,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 371 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 17:22:58,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-11-23 17:22:58,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 636. [2021-11-23 17:22:58,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 636 states, 635 states have (on average 1.3338582677165354) internal successors, (847), 635 states have internal predecessors, (847), 0 states have call successors, (0), 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 17:22:58,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 636 states to 636 states and 847 transitions. [2021-11-23 17:22:58,146 INFO L78 Accepts]: Start accepts. Automaton has 636 states and 847 transitions. Word has length 62 [2021-11-23 17:22:58,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:22:58,146 INFO L470 AbstractCegarLoop]: Abstraction has 636 states and 847 transitions. [2021-11-23 17:22:58,147 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.2) internal successors, (61), 5 states have internal predecessors, (61), 0 states have call successors, (0), 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 17:22:58,147 INFO L276 IsEmpty]: Start isEmpty. Operand 636 states and 847 transitions. [2021-11-23 17:22:58,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:22:58,148 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:22:58,148 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:22:58,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-23 17:22:58,359 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:22:58,360 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:22:58,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:22:58,361 INFO L85 PathProgramCache]: Analyzing trace with hash 392958652, now seen corresponding path program 1 times [2021-11-23 17:22:58,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:22:58,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2069917569] [2021-11-23 17:22:58,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:22:58,362 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:22:58,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:22:58,363 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:22:58,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-23 17:22:58,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:22:58,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:22:58,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:01,175 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:01,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:02,728 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:02,729 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:02,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2069917569] [2021-11-23 17:23:02,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2069917569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:02,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2121845795] [2021-11-23 17:23:02,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:02,730 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:02,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:02,745 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:02,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-23 17:23:02,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:02,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:02,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:04,798 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:04,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:05,471 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:05,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2121845795] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:05,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937366078] [2021-11-23 17:23:05,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:05,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:05,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:05,474 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:05,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 17:23:05,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:05,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:23:05,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:08,437 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:08,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:09,348 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:09,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937366078] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:09,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:09,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21, 20, 18, 17] total 55 [2021-11-23 17:23:09,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935638807] [2021-11-23 17:23:09,350 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:09,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:23:09,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:09,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:23:09,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=2613, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:23:09,353 INFO L87 Difference]: Start difference. First operand 636 states and 847 transitions. Second operand has 55 states, 55 states have (on average 3.272727272727273) internal successors, (180), 55 states have internal predecessors, (180), 0 states have call successors, (0), 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 17:23:10,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:10,158 INFO L93 Difference]: Finished difference Result 1071 states and 1417 transitions. [2021-11-23 17:23:10,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:23:10,159 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.272727272727273) internal successors, (180), 55 states have internal predecessors, (180), 0 states have call successors, (0), 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 63 [2021-11-23 17:23:10,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:10,164 INFO L225 Difference]: With dead ends: 1071 [2021-11-23 17:23:10,164 INFO L226 Difference]: Without dead ends: 841 [2021-11-23 17:23:10,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1259 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=423, Invalid=2883, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:23:10,168 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 160 mSDsluCounter, 1314 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 1390 SdHoareTripleChecker+Invalid, 565 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 266 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:10,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 1390 Invalid, 565 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 281 Invalid, 0 Unknown, 266 Unchecked, 0.4s Time] [2021-11-23 17:23:10,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 841 states. [2021-11-23 17:23:10,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 841 to 642. [2021-11-23 17:23:10,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 642 states, 641 states have (on average 1.3322932917316692) internal successors, (854), 641 states have internal predecessors, (854), 0 states have call successors, (0), 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 17:23:10,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 642 states to 642 states and 854 transitions. [2021-11-23 17:23:10,235 INFO L78 Accepts]: Start accepts. Automaton has 642 states and 854 transitions. Word has length 63 [2021-11-23 17:23:10,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:10,236 INFO L470 AbstractCegarLoop]: Abstraction has 642 states and 854 transitions. [2021-11-23 17:23:10,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.272727272727273) internal successors, (180), 55 states have internal predecessors, (180), 0 states have call successors, (0), 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 17:23:10,236 INFO L276 IsEmpty]: Start isEmpty. Operand 642 states and 854 transitions. [2021-11-23 17:23:10,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 17:23:10,237 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:10,237 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:23:10,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:10,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:10,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-23 17:23:10,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:10,860 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:10,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:10,860 INFO L85 PathProgramCache]: Analyzing trace with hash -349929546, now seen corresponding path program 1 times [2021-11-23 17:23:10,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:10,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2147419612] [2021-11-23 17:23:10,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:10,861 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:10,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:10,862 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:10,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 17:23:10,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:10,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:23:10,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:12,581 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:12,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:13,533 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:13,533 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:13,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2147419612] [2021-11-23 17:23:13,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2147419612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:13,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [988654504] [2021-11-23 17:23:13,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:13,533 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:13,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:13,534 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:13,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 17:23:13,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:13,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:23:13,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:15,075 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:15,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:15,519 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:15,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [988654504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:15,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656494711] [2021-11-23 17:23:15,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:15,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:15,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:15,521 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:15,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-23 17:23:15,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:15,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:15,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:16,730 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:16,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:17,121 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:17,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656494711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:17,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:17,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 20, 18, 19, 18] total 36 [2021-11-23 17:23:17,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930732736] [2021-11-23 17:23:17,122 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:17,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 17:23:17,123 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:17,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 17:23:17,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=1048, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 17:23:17,124 INFO L87 Difference]: Start difference. First operand 642 states and 854 transitions. Second operand has 36 states, 36 states have (on average 3.3055555555555554) internal successors, (119), 36 states have internal predecessors, (119), 0 states have call successors, (0), 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 17:23:17,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:17,775 INFO L93 Difference]: Finished difference Result 943 states and 1252 transitions. [2021-11-23 17:23:17,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:23:17,776 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.3055555555555554) internal successors, (119), 36 states have internal predecessors, (119), 0 states have call successors, (0), 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 63 [2021-11-23 17:23:17,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:17,780 INFO L225 Difference]: With dead ends: 943 [2021-11-23 17:23:17,780 INFO L226 Difference]: Without dead ends: 703 [2021-11-23 17:23:17,781 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 338 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=270, Invalid=1212, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 17:23:17,783 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 129 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:17,783 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 756 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 277 Invalid, 0 Unknown, 62 Unchecked, 0.3s Time] [2021-11-23 17:23:17,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-11-23 17:23:17,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 628. [2021-11-23 17:23:17,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 628 states, 627 states have (on average 1.331738437001595) internal successors, (835), 627 states have internal predecessors, (835), 0 states have call successors, (0), 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 17:23:17,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 628 states to 628 states and 835 transitions. [2021-11-23 17:23:17,841 INFO L78 Accepts]: Start accepts. Automaton has 628 states and 835 transitions. Word has length 63 [2021-11-23 17:23:17,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:17,842 INFO L470 AbstractCegarLoop]: Abstraction has 628 states and 835 transitions. [2021-11-23 17:23:17,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.3055555555555554) internal successors, (119), 36 states have internal predecessors, (119), 0 states have call successors, (0), 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 17:23:17,842 INFO L276 IsEmpty]: Start isEmpty. Operand 628 states and 835 transitions. [2021-11-23 17:23:17,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:23:17,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:17,843 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] [2021-11-23 17:23:17,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:18,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:18,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:18,472 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:18,472 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:18,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:18,473 INFO L85 PathProgramCache]: Analyzing trace with hash 1441254617, now seen corresponding path program 1 times [2021-11-23 17:23:18,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:18,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1273732872] [2021-11-23 17:23:18,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:18,474 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:18,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:18,475 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:18,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Waiting until timeout for monitored process [2021-11-23 17:23:18,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:18,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:23:18,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:21,616 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:21,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:23,803 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:23,804 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:23,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1273732872] [2021-11-23 17:23:23,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1273732872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:23,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1289676327] [2021-11-23 17:23:23,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:23,804 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:23,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:23,805 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:23,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Waiting until timeout for monitored process [2021-11-23 17:23:23,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:23,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:23,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:27,833 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:27,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:28,980 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:28,981 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1289676327] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:28,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140040800] [2021-11-23 17:23:28,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:28,981 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:28,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:28,982 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:28,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-23 17:23:29,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:29,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:29,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:30,810 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:30,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:31,380 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:31,380 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140040800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:31,380 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:31,381 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18, 23, 20, 23, 20] total 54 [2021-11-23 17:23:31,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331593676] [2021-11-23 17:23:31,381 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:31,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-23 17:23:31,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:31,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-23 17:23:31,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=2510, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 17:23:31,384 INFO L87 Difference]: Start difference. First operand 628 states and 835 transitions. Second operand has 54 states, 54 states have (on average 2.962962962962963) internal successors, (160), 54 states have internal predecessors, (160), 0 states have call successors, (0), 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 17:23:31,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:31,781 INFO L93 Difference]: Finished difference Result 899 states and 1201 transitions. [2021-11-23 17:23:31,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 17:23:31,782 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.962962962962963) internal successors, (160), 54 states have internal predecessors, (160), 0 states have call successors, (0), 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 64 [2021-11-23 17:23:31,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:31,792 INFO L225 Difference]: With dead ends: 899 [2021-11-23 17:23:31,792 INFO L226 Difference]: Without dead ends: 673 [2021-11-23 17:23:31,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 324 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=376, Invalid=2594, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:23:31,801 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 154 mSDsluCounter, 798 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 855 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 212 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:31,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 855 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 134 Invalid, 0 Unknown, 212 Unchecked, 0.2s Time] [2021-11-23 17:23:31,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-11-23 17:23:31,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 634. [2021-11-23 17:23:31,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 634 states, 633 states have (on average 1.3317535545023698) internal successors, (843), 633 states have internal predecessors, (843), 0 states have call successors, (0), 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 17:23:31,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 634 states to 634 states and 843 transitions. [2021-11-23 17:23:31,889 INFO L78 Accepts]: Start accepts. Automaton has 634 states and 843 transitions. Word has length 64 [2021-11-23 17:23:31,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:31,889 INFO L470 AbstractCegarLoop]: Abstraction has 634 states and 843 transitions. [2021-11-23 17:23:31,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.962962962962963) internal successors, (160), 54 states have internal predecessors, (160), 0 states have call successors, (0), 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 17:23:31,890 INFO L276 IsEmpty]: Start isEmpty. Operand 634 states and 843 transitions. [2021-11-23 17:23:31,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:23:31,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:31,891 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:23:31,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (35)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:32,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:32,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (34)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:32,504 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:32,504 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:32,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:32,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1444428534, now seen corresponding path program 1 times [2021-11-23 17:23:32,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:32,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1682046455] [2021-11-23 17:23:32,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:32,505 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:32,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:32,506 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:32,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 17:23:32,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:32,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:23:32,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:32,751 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:32,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:32,873 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:32,873 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:32,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1682046455] [2021-11-23 17:23:32,873 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1682046455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:32,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [77777196] [2021-11-23 17:23:32,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:32,873 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:32,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:32,874 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:32,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 17:23:32,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:32,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:23:32,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:33,174 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:33,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:33,298 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:33,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [77777196] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:33,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205965299] [2021-11-23 17:23:33,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:33,299 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:33,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:33,300 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:33,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-23 17:23:33,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:33,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:23:33,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:33,532 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:33,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:33,668 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:33,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205965299] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:33,669 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:33,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4, 4] total 6 [2021-11-23 17:23:33,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351838232] [2021-11-23 17:23:33,669 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:33,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 17:23:33,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:33,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 17:23:33,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:23:33,670 INFO L87 Difference]: Start difference. First operand 634 states and 843 transitions. Second operand has 6 states, 6 states have (on average 20.5) internal successors, (123), 6 states have internal predecessors, (123), 0 states have call successors, (0), 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 17:23:33,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:33,780 INFO L93 Difference]: Finished difference Result 2054 states and 2715 transitions. [2021-11-23 17:23:33,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 17:23:33,781 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 20.5) internal successors, (123), 6 states have internal predecessors, (123), 0 states have call successors, (0), 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 64 [2021-11-23 17:23:33,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:33,789 INFO L225 Difference]: With dead ends: 2054 [2021-11-23 17:23:33,789 INFO L226 Difference]: Without dead ends: 1492 [2021-11-23 17:23:33,790 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 371 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-23 17:23:33,791 INFO L933 BasicCegarLoop]: 97 mSDtfsCounter, 207 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 6 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:33,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 323 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 16 Invalid, 0 Unknown, 6 Unchecked, 0.0s Time] [2021-11-23 17:23:33,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1492 states. [2021-11-23 17:23:33,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1492 to 1389. [2021-11-23 17:23:33,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1389 states, 1388 states have (on average 1.3069164265129682) internal successors, (1814), 1388 states have internal predecessors, (1814), 0 states have call successors, (0), 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 17:23:33,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1389 states to 1389 states and 1814 transitions. [2021-11-23 17:23:33,926 INFO L78 Accepts]: Start accepts. Automaton has 1389 states and 1814 transitions. Word has length 64 [2021-11-23 17:23:33,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:33,927 INFO L470 AbstractCegarLoop]: Abstraction has 1389 states and 1814 transitions. [2021-11-23 17:23:33,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 20.5) internal successors, (123), 6 states have internal predecessors, (123), 0 states have call successors, (0), 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 17:23:33,927 INFO L276 IsEmpty]: Start isEmpty. Operand 1389 states and 1814 transitions. [2021-11-23 17:23:33,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 17:23:33,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:33,928 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-23 17:23:33,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:34,145 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (38)] Ended with exit code 0 [2021-11-23 17:23:34,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:34,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:34,544 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:34,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:34,545 INFO L85 PathProgramCache]: Analyzing trace with hash 1615439011, now seen corresponding path program 1 times [2021-11-23 17:23:34,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:34,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1103718755] [2021-11-23 17:23:34,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:34,546 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:34,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:34,547 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:34,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Waiting until timeout for monitored process [2021-11-23 17:23:34,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:34,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 17:23:34,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:36,817 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:36,818 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:38,295 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:38,295 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:38,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1103718755] [2021-11-23 17:23:38,295 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1103718755] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:38,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [722731907] [2021-11-23 17:23:38,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:38,296 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:38,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:38,296 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:38,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Waiting until timeout for monitored process [2021-11-23 17:23:38,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:38,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 17:23:38,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:40,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:40,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:41,495 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:41,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [722731907] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:41,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43432233] [2021-11-23 17:23:41,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:41,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:41,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:41,496 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:41,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-23 17:23:41,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:41,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:23:41,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:43,851 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:43,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:44,684 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:44,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43432233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:44,685 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:44,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 22, 20, 16, 15] total 72 [2021-11-23 17:23:44,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646336641] [2021-11-23 17:23:44,685 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:44,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:23:44,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:44,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:23:44,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4416, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:23:44,689 INFO L87 Difference]: Start difference. First operand 1389 states and 1814 transitions. Second operand has 72 states, 72 states have (on average 3.2083333333333335) internal successors, (231), 72 states have internal predecessors, (231), 0 states have call successors, (0), 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 17:23:45,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:45,380 INFO L93 Difference]: Finished difference Result 2082 states and 2695 transitions. [2021-11-23 17:23:45,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 17:23:45,380 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.2083333333333335) internal successors, (231), 72 states have internal predecessors, (231), 0 states have call successors, (0), 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 64 [2021-11-23 17:23:45,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:45,391 INFO L225 Difference]: With dead ends: 2082 [2021-11-23 17:23:45,391 INFO L226 Difference]: Without dead ends: 1522 [2021-11-23 17:23:45,396 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 308 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2593 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=792, Invalid=4758, Unknown=0, NotChecked=0, Total=5550 [2021-11-23 17:23:45,398 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 231 mSDsluCounter, 1324 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 1409 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 189 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:45,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [231 Valid, 1409 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 327 Invalid, 0 Unknown, 189 Unchecked, 0.3s Time] [2021-11-23 17:23:45,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1522 states. [2021-11-23 17:23:45,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1522 to 1202. [2021-11-23 17:23:45,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1202 states, 1201 states have (on average 1.3005828476269776) internal successors, (1562), 1201 states have internal predecessors, (1562), 0 states have call successors, (0), 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 17:23:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1202 states to 1202 states and 1562 transitions. [2021-11-23 17:23:45,533 INFO L78 Accepts]: Start accepts. Automaton has 1202 states and 1562 transitions. Word has length 64 [2021-11-23 17:23:45,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:45,534 INFO L470 AbstractCegarLoop]: Abstraction has 1202 states and 1562 transitions. [2021-11-23 17:23:45,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.2083333333333335) internal successors, (231), 72 states have internal predecessors, (231), 0 states have call successors, (0), 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 17:23:45,535 INFO L276 IsEmpty]: Start isEmpty. Operand 1202 states and 1562 transitions. [2021-11-23 17:23:45,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:23:45,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:45,536 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] [2021-11-23 17:23:45,551 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (41)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:45,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (40)] Ended with exit code 0 [2021-11-23 17:23:45,961 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-23 17:23:46,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:46,138 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:46,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:46,139 INFO L85 PathProgramCache]: Analyzing trace with hash 1790425593, now seen corresponding path program 1 times [2021-11-23 17:23:46,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:46,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [423025588] [2021-11-23 17:23:46,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:46,139 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:46,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:46,141 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:46,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 17:23:46,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:46,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:46,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:47,314 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:47,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:47,655 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:47,655 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:47,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [423025588] [2021-11-23 17:23:47,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [423025588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:47,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1002472284] [2021-11-23 17:23:47,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:47,656 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:47,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:47,662 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:47,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 17:23:47,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:47,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:47,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:48,740 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:48,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:48,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1002472284] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:48,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355116085] [2021-11-23 17:23:48,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:48,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:48,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:48,897 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:48,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-23 17:23:48,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:48,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:23:48,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:49,881 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:49,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:50,027 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:50,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355116085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:50,028 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:50,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 11, 9, 10, 9] total 18 [2021-11-23 17:23:50,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780590871] [2021-11-23 17:23:50,028 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:50,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:23:50,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:50,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:23:50,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:23:50,030 INFO L87 Difference]: Start difference. First operand 1202 states and 1562 transitions. Second operand has 18 states, 18 states have (on average 6.5) internal successors, (117), 18 states have internal predecessors, (117), 0 states have call successors, (0), 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 17:23:50,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:50,167 INFO L93 Difference]: Finished difference Result 1552 states and 2029 transitions. [2021-11-23 17:23:50,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:23:50,167 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 6.5) internal successors, (117), 18 states have internal predecessors, (117), 0 states have call successors, (0), 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 65 [2021-11-23 17:23:50,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:50,173 INFO L225 Difference]: With dead ends: 1552 [2021-11-23 17:23:50,173 INFO L226 Difference]: Without dead ends: 1144 [2021-11-23 17:23:50,174 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 368 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-11-23 17:23:50,174 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 33 mSDsluCounter, 922 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 994 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:50,175 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 994 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 99 Unchecked, 0.0s Time] [2021-11-23 17:23:50,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1144 states. [2021-11-23 17:23:50,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1144 to 1133. [2021-11-23 17:23:50,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1133 states, 1132 states have (on average 1.297703180212014) internal successors, (1469), 1132 states have internal predecessors, (1469), 0 states have call successors, (0), 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 17:23:50,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1133 states to 1133 states and 1469 transitions. [2021-11-23 17:23:50,297 INFO L78 Accepts]: Start accepts. Automaton has 1133 states and 1469 transitions. Word has length 65 [2021-11-23 17:23:50,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:50,297 INFO L470 AbstractCegarLoop]: Abstraction has 1133 states and 1469 transitions. [2021-11-23 17:23:50,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 6.5) internal successors, (117), 18 states have internal predecessors, (117), 0 states have call successors, (0), 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 17:23:50,298 INFO L276 IsEmpty]: Start isEmpty. Operand 1133 states and 1469 transitions. [2021-11-23 17:23:50,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 17:23:50,298 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:50,299 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] [2021-11-23 17:23:50,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:50,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2021-11-23 17:23:50,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-23 17:23:50,901 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:50,901 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:50,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:50,901 INFO L85 PathProgramCache]: Analyzing trace with hash 159944273, now seen corresponding path program 1 times [2021-11-23 17:23:50,902 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:50,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [543701510] [2021-11-23 17:23:50,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:50,902 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:50,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:50,903 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:50,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Waiting until timeout for monitored process [2021-11-23 17:23:50,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:50,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 17:23:50,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:51,164 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:51,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:51,312 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:23:51,312 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:51,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [543701510] [2021-11-23 17:23:51,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [543701510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:51,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [680754958] [2021-11-23 17:23:51,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:51,313 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:51,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:51,314 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:51,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Waiting until timeout for monitored process [2021-11-23 17:23:51,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:51,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:23:51,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:51,508 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 17:23:51,508 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:23:51,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [680754958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:23:51,509 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 17:23:51,509 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2021-11-23 17:23:51,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826481993] [2021-11-23 17:23:51,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:51,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:23:51,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:51,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:23:51,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:23:51,510 INFO L87 Difference]: Start difference. First operand 1133 states and 1469 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 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 17:23:51,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:51,599 INFO L93 Difference]: Finished difference Result 2345 states and 3052 transitions. [2021-11-23 17:23:51,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:23:51,600 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 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 65 [2021-11-23 17:23:51,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:51,606 INFO L225 Difference]: With dead ends: 2345 [2021-11-23 17:23:51,606 INFO L226 Difference]: Without dead ends: 1335 [2021-11-23 17:23:51,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 187 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 17:23:51,609 INFO L933 BasicCegarLoop]: 85 mSDtfsCounter, 54 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:51,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 138 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:23:51,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1335 states. [2021-11-23 17:23:51,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1335 to 1079. [2021-11-23 17:23:51,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1079 states, 1078 states have (on average 1.2931354359925789) internal successors, (1394), 1078 states have internal predecessors, (1394), 0 states have call successors, (0), 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 17:23:51,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1079 states to 1079 states and 1394 transitions. [2021-11-23 17:23:51,723 INFO L78 Accepts]: Start accepts. Automaton has 1079 states and 1394 transitions. Word has length 65 [2021-11-23 17:23:51,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:51,723 INFO L470 AbstractCegarLoop]: Abstraction has 1079 states and 1394 transitions. [2021-11-23 17:23:51,723 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 0 states have call successors, (0), 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 17:23:51,724 INFO L276 IsEmpty]: Start isEmpty. Operand 1079 states and 1394 transitions. [2021-11-23 17:23:51,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-23 17:23:51,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:51,725 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:51,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (46)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:51,941 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (47)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:52,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:52,137 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:52,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:52,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1059629652, now seen corresponding path program 1 times [2021-11-23 17:23:52,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:52,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1684787008] [2021-11-23 17:23:52,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:52,138 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:52,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:52,139 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:52,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 17:23:52,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:52,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 17:23:52,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:52,351 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:23:52,352 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:23:52,352 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:52,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1684787008] [2021-11-23 17:23:52,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1684787008] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:23:52,352 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:23:52,352 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 17:23:52,352 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069233945] [2021-11-23 17:23:52,352 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:23:52,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 17:23:52,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:52,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 17:23:52,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 17:23:52,354 INFO L87 Difference]: Start difference. First operand 1079 states and 1394 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 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 17:23:52,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:52,398 INFO L93 Difference]: Finished difference Result 1554 states and 2012 transitions. [2021-11-23 17:23:52,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 17:23:52,399 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 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 86 [2021-11-23 17:23:52,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:52,401 INFO L225 Difference]: With dead ends: 1554 [2021-11-23 17:23:52,401 INFO L226 Difference]: Without dead ends: 555 [2021-11-23 17:23:52,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 84 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 17:23:52,403 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 23 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 139 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 17:23:52,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 139 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 17:23:52,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-11-23 17:23:52,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 553. [2021-11-23 17:23:52,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 552 states have (on average 1.2554347826086956) internal successors, (693), 552 states have internal predecessors, (693), 0 states have call successors, (0), 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 17:23:52,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 693 transitions. [2021-11-23 17:23:52,454 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 693 transitions. Word has length 86 [2021-11-23 17:23:52,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:52,454 INFO L470 AbstractCegarLoop]: Abstraction has 553 states and 693 transitions. [2021-11-23 17:23:52,455 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 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 17:23:52,455 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 693 transitions. [2021-11-23 17:23:52,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:23:52,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:52,456 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:23:52,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:52,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:52,669 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:52,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:52,670 INFO L85 PathProgramCache]: Analyzing trace with hash 169419817, now seen corresponding path program 1 times [2021-11-23 17:23:52,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:52,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1696790298] [2021-11-23 17:23:52,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:52,670 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:52,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:52,671 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:52,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 17:23:52,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:52,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:52,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:54,132 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:23:54,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:54,536 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:23:54,536 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:23:54,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1696790298] [2021-11-23 17:23:54,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1696790298] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:54,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1303553144] [2021-11-23 17:23:54,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:54,537 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:23:54,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:23:54,538 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:23:54,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-23 17:23:54,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:54,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:23:54,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:55,805 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:23:55,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:56,049 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 17:23:56,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1303553144] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:56,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293782616] [2021-11-23 17:23:56,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:56,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:23:56,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:23:56,051 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:23:56,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-23 17:23:56,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:56,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:23:56,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:56,678 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:23:56,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:23:57,207 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:23:57,208 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293782616] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:23:57,208 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:23:57,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:23:57,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195420126] [2021-11-23 17:23:57,209 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:23:57,210 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:23:57,210 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:23:57,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:23:57,211 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:23:57,211 INFO L87 Difference]: Start difference. First operand 553 states and 693 transitions. Second operand has 22 states, 22 states have (on average 13.0) internal successors, (286), 21 states have internal predecessors, (286), 0 states have call successors, (0), 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 17:23:57,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:23:57,498 INFO L93 Difference]: Finished difference Result 1052 states and 1330 transitions. [2021-11-23 17:23:57,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:23:57,498 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 13.0) internal successors, (286), 21 states have internal predecessors, (286), 0 states have call successors, (0), 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 106 [2021-11-23 17:23:57,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:23:57,501 INFO L225 Difference]: With dead ends: 1052 [2021-11-23 17:23:57,501 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 17:23:57,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 644 GetRequests, 615 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=173, Invalid=757, Unknown=0, NotChecked=0, Total=930 [2021-11-23 17:23:57,503 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 98 mSDsluCounter, 653 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 716 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:23:57,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 716 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 81 Unchecked, 0.0s Time] [2021-11-23 17:23:57,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 17:23:57,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-23 17:23:57,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.2491289198606272) internal successors, (717), 574 states have internal predecessors, (717), 0 states have call successors, (0), 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 17:23:57,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 717 transitions. [2021-11-23 17:23:57,562 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 717 transitions. Word has length 106 [2021-11-23 17:23:57,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:23:57,562 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 717 transitions. [2021-11-23 17:23:57,563 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 13.0) internal successors, (286), 21 states have internal predecessors, (286), 0 states have call successors, (0), 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 17:23:57,563 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 717 transitions. [2021-11-23 17:23:57,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:23:57,564 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:23:57,564 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 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] [2021-11-23 17:23:57,580 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (50)] Ended with exit code 0 [2021-11-23 17:23:57,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-23 17:23:57,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (49)] Forceful destruction successful, exit code 0 [2021-11-23 17:23:58,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:23:58,168 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:23:58,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:23:58,168 INFO L85 PathProgramCache]: Analyzing trace with hash -1571997298, now seen corresponding path program 1 times [2021-11-23 17:23:58,168 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:23:58,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1863392816] [2021-11-23 17:23:58,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:23:58,169 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:23:58,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:23:58,170 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:23:58,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Waiting until timeout for monitored process [2021-11-23 17:23:58,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:23:58,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:23:58,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:23:59,919 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:23:59,919 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:00,436 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:00,436 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:00,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1863392816] [2021-11-23 17:24:00,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1863392816] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:00,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1071987753] [2021-11-23 17:24:00,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:00,437 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:00,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:00,438 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:00,442 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (53)] Waiting until timeout for monitored process [2021-11-23 17:24:00,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:00,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:00,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:01,958 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:01,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:02,315 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:02,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1071987753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:02,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766036567] [2021-11-23 17:24:02,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:02,316 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:02,316 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:02,317 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:02,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-23 17:24:02,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:02,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:02,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:03,618 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:03,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:04,277 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:04,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766036567] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:04,277 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:04,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:24:04,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252040600] [2021-11-23 17:24:04,278 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:04,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:24:04,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:04,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:24:04,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:24:04,281 INFO L87 Difference]: Start difference. First operand 575 states and 717 transitions. Second operand has 34 states, 34 states have (on average 9.529411764705882) internal successors, (324), 33 states have internal predecessors, (324), 0 states have call successors, (0), 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 17:24:04,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:04,783 INFO L93 Difference]: Finished difference Result 1059 states and 1328 transitions. [2021-11-23 17:24:04,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:24:04,784 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 9.529411764705882) internal successors, (324), 33 states have internal predecessors, (324), 0 states have call successors, (0), 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 106 [2021-11-23 17:24:04,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:04,786 INFO L225 Difference]: With dead ends: 1059 [2021-11-23 17:24:04,786 INFO L226 Difference]: Without dead ends: 624 [2021-11-23 17:24:04,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 644 GetRequests, 602 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=250, Invalid=1642, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:24:04,789 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 160 mSDsluCounter, 1108 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 1178 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:04,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 1178 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 56 Invalid, 0 Unknown, 117 Unchecked, 0.1s Time] [2021-11-23 17:24:04,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-11-23 17:24:04,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 624. [2021-11-23 17:24:04,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 624 states, 623 states have (on average 1.2359550561797752) internal successors, (770), 623 states have internal predecessors, (770), 0 states have call successors, (0), 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 17:24:04,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 624 states to 624 states and 770 transitions. [2021-11-23 17:24:04,862 INFO L78 Accepts]: Start accepts. Automaton has 624 states and 770 transitions. Word has length 106 [2021-11-23 17:24:04,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:04,862 INFO L470 AbstractCegarLoop]: Abstraction has 624 states and 770 transitions. [2021-11-23 17:24:04,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 9.529411764705882) internal successors, (324), 33 states have internal predecessors, (324), 0 states have call successors, (0), 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 17:24:04,863 INFO L276 IsEmpty]: Start isEmpty. Operand 624 states and 770 transitions. [2021-11-23 17:24:04,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:24:04,864 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:04,864 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:24:04,883 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (52)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:05,103 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2021-11-23 17:24:05,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (53)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:05,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:05,479 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:05,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:05,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1667272311, now seen corresponding path program 1 times [2021-11-23 17:24:05,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:05,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1307242633] [2021-11-23 17:24:05,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:05,480 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:05,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:05,481 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:05,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Waiting until timeout for monitored process [2021-11-23 17:24:05,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:05,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:05,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:07,222 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:07,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:07,818 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:07,818 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:07,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1307242633] [2021-11-23 17:24:07,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1307242633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:07,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1595572590] [2021-11-23 17:24:07,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:07,819 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:07,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:07,823 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:07,824 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (56)] Waiting until timeout for monitored process [2021-11-23 17:24:08,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:08,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:08,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:09,487 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:09,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:09,885 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:09,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1595572590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:09,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368556984] [2021-11-23 17:24:09,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:09,886 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:09,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:09,887 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:09,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-23 17:24:09,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:09,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:09,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:11,597 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 62 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:24:11,598 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:12,151 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 22 proven. 62 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 17:24:12,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368556984] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:12,151 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:12,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:24:12,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104303741] [2021-11-23 17:24:12,152 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:12,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:24:12,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:12,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:24:12,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:24:12,154 INFO L87 Difference]: Start difference. First operand 624 states and 770 transitions. Second operand has 34 states, 34 states have (on average 9.823529411764707) internal successors, (334), 33 states have internal predecessors, (334), 0 states have call successors, (0), 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 17:24:12,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:12,651 INFO L93 Difference]: Finished difference Result 1179 states and 1460 transitions. [2021-11-23 17:24:12,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:24:12,652 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 9.823529411764707) internal successors, (334), 33 states have internal predecessors, (334), 0 states have call successors, (0), 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 106 [2021-11-23 17:24:12,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:12,656 INFO L225 Difference]: With dead ends: 1179 [2021-11-23 17:24:12,657 INFO L226 Difference]: Without dead ends: 750 [2021-11-23 17:24:12,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 600 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=243, Invalid=1649, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:24:12,659 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 138 mSDsluCounter, 1051 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 1125 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:12,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 1125 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 132 Unchecked, 0.0s Time] [2021-11-23 17:24:12,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 750 states. [2021-11-23 17:24:12,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 750 to 750. [2021-11-23 17:24:12,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 750 states, 749 states have (on average 1.2149532710280373) internal successors, (910), 749 states have internal predecessors, (910), 0 states have call successors, (0), 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 17:24:12,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 750 states to 750 states and 910 transitions. [2021-11-23 17:24:12,725 INFO L78 Accepts]: Start accepts. Automaton has 750 states and 910 transitions. Word has length 106 [2021-11-23 17:24:12,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:12,726 INFO L470 AbstractCegarLoop]: Abstraction has 750 states and 910 transitions. [2021-11-23 17:24:12,726 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 9.823529411764707) internal successors, (334), 33 states have internal predecessors, (334), 0 states have call successors, (0), 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 17:24:12,726 INFO L276 IsEmpty]: Start isEmpty. Operand 750 states and 910 transitions. [2021-11-23 17:24:12,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:24:12,727 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:12,727 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:24:12,729 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (56)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:12,938 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (55)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:13,154 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-23 17:24:13,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:13,330 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:13,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:13,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1473748879, now seen corresponding path program 1 times [2021-11-23 17:24:13,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:13,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [532876138] [2021-11-23 17:24:13,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:13,331 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:13,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:13,332 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:13,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Waiting until timeout for monitored process [2021-11-23 17:24:13,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:13,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:13,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:15,369 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:15,370 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:15,841 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:15,841 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:15,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [532876138] [2021-11-23 17:24:15,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [532876138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:15,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1646754319] [2021-11-23 17:24:15,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:15,842 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:15,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:15,842 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:15,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Waiting until timeout for monitored process [2021-11-23 17:24:16,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:16,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:24:16,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:17,683 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:17,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:17,967 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:17,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1646754319] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:17,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057729823] [2021-11-23 17:24:17,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:17,968 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:17,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:17,968 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:17,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-23 17:24:18,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:18,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:18,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:19,710 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:24:19,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:20,303 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 13 proven. 69 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:24:20,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057729823] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:20,304 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:20,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 8, 8] total 33 [2021-11-23 17:24:20,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996297015] [2021-11-23 17:24:20,304 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:20,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-23 17:24:20,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:20,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-23 17:24:20,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=981, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 17:24:20,307 INFO L87 Difference]: Start difference. First operand 750 states and 910 transitions. Second operand has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 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 17:24:20,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:20,887 INFO L93 Difference]: Finished difference Result 1275 states and 1568 transitions. [2021-11-23 17:24:20,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 17:24:20,887 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 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 106 [2021-11-23 17:24:20,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:20,891 INFO L225 Difference]: With dead ends: 1275 [2021-11-23 17:24:20,891 INFO L226 Difference]: Without dead ends: 858 [2021-11-23 17:24:20,893 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 644 GetRequests, 602 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 17:24:20,894 INFO L933 BasicCegarLoop]: 77 mSDtfsCounter, 151 mSDsluCounter, 1087 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 1164 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 152 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:20,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 1164 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 52 Invalid, 0 Unknown, 152 Unchecked, 0.0s Time] [2021-11-23 17:24:20,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 858 states. [2021-11-23 17:24:20,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 858 to 858. [2021-11-23 17:24:20,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 858 states, 857 states have (on average 1.206534422403734) internal successors, (1034), 857 states have internal predecessors, (1034), 0 states have call successors, (0), 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 17:24:20,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 1034 transitions. [2021-11-23 17:24:20,980 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 1034 transitions. Word has length 106 [2021-11-23 17:24:20,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:20,981 INFO L470 AbstractCegarLoop]: Abstraction has 858 states and 1034 transitions. [2021-11-23 17:24:20,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 10.264705882352942) internal successors, (349), 33 states have internal predecessors, (349), 0 states have call successors, (0), 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 17:24:20,981 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 1034 transitions. [2021-11-23 17:24:20,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:24:20,983 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:20,983 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:20,996 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (58)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:21,220 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2021-11-23 17:24:21,398 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (59)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:21,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:21,596 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:21,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:21,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1940268525, now seen corresponding path program 1 times [2021-11-23 17:24:21,597 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:21,597 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1049746411] [2021-11-23 17:24:21,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:21,598 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:21,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:21,598 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:21,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Waiting until timeout for monitored process [2021-11-23 17:24:21,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:21,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:21,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:22,989 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 52 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:22,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:23,449 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 52 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:23,449 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:23,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1049746411] [2021-11-23 17:24:23,450 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1049746411] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:23,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [173698446] [2021-11-23 17:24:23,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:23,450 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:23,450 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:23,468 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:23,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Waiting until timeout for monitored process [2021-11-23 17:24:23,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:23,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:23,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:24,817 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 52 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:24,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:25,132 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 52 proven. 32 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 17:24:25,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [173698446] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:25,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [451649592] [2021-11-23 17:24:25,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:25,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:25,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:25,133 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:25,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-23 17:24:25,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:25,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:24:25,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:25,932 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 52 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:24:25,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:26,670 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 52 proven. 26 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:24:26,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [451649592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:26,671 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:26,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:24:26,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272654156] [2021-11-23 17:24:26,671 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:26,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:24:26,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:26,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:24:26,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:24:26,673 INFO L87 Difference]: Start difference. First operand 858 states and 1034 transitions. Second operand has 22 states, 22 states have (on average 13.454545454545455) internal successors, (296), 21 states have internal predecessors, (296), 0 states have call successors, (0), 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 17:24:27,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:27,027 INFO L93 Difference]: Finished difference Result 1329 states and 1639 transitions. [2021-11-23 17:24:27,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:24:27,028 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 13.454545454545455) internal successors, (296), 21 states have internal predecessors, (296), 0 states have call successors, (0), 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 106 [2021-11-23 17:24:27,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:27,042 INFO L225 Difference]: With dead ends: 1329 [2021-11-23 17:24:27,043 INFO L226 Difference]: Without dead ends: 858 [2021-11-23 17:24:27,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 613 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:24:27,050 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 115 mSDsluCounter, 726 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:27,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [115 Valid, 791 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 104 Unchecked, 0.0s Time] [2021-11-23 17:24:27,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 858 states. [2021-11-23 17:24:27,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 858 to 858. [2021-11-23 17:24:27,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 858 states, 857 states have (on average 1.2018669778296382) internal successors, (1030), 857 states have internal predecessors, (1030), 0 states have call successors, (0), 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 17:24:27,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 1030 transitions. [2021-11-23 17:24:27,135 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 1030 transitions. Word has length 106 [2021-11-23 17:24:27,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:27,135 INFO L470 AbstractCegarLoop]: Abstraction has 858 states and 1030 transitions. [2021-11-23 17:24:27,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 13.454545454545455) internal successors, (296), 21 states have internal predecessors, (296), 0 states have call successors, (0), 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 17:24:27,135 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 1030 transitions. [2021-11-23 17:24:27,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-23 17:24:27,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:27,137 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:27,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (62)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:27,344 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (61)] Ended with exit code 0 [2021-11-23 17:24:27,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:27,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:27,738 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:27,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:27,738 INFO L85 PathProgramCache]: Analyzing trace with hash 531538542, now seen corresponding path program 1 times [2021-11-23 17:24:27,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:27,738 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [557445716] [2021-11-23 17:24:27,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:27,739 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:27,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:27,740 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:27,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Waiting until timeout for monitored process [2021-11-23 17:24:27,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:27,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:27,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:28,860 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:24:28,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:29,341 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:24:29,341 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:29,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [557445716] [2021-11-23 17:24:29,342 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [557445716] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:29,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1781309437] [2021-11-23 17:24:29,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:29,342 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:29,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:29,344 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:29,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (65)] Waiting until timeout for monitored process [2021-11-23 17:24:29,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:29,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:24:29,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:30,420 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:24:30,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:30,802 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:24:30,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1781309437] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:30,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926706720] [2021-11-23 17:24:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:30,803 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:30,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:30,804 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:30,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-23 17:24:30,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:30,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 17:24:30,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:31,386 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:24:31,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:31,847 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 17:24:31,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926706720] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:31,848 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:31,848 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 4, 4] total 21 [2021-11-23 17:24:31,848 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747139443] [2021-11-23 17:24:31,849 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:31,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:24:31,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:31,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:24:31,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:24:31,851 INFO L87 Difference]: Start difference. First operand 858 states and 1030 transitions. Second operand has 22 states, 22 states have (on average 12.363636363636363) internal successors, (272), 21 states have internal predecessors, (272), 0 states have call successors, (0), 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 17:24:32,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:32,211 INFO L93 Difference]: Finished difference Result 1341 states and 1649 transitions. [2021-11-23 17:24:32,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:24:32,211 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 12.363636363636363) internal successors, (272), 21 states have internal predecessors, (272), 0 states have call successors, (0), 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 106 [2021-11-23 17:24:32,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:32,215 INFO L225 Difference]: With dead ends: 1341 [2021-11-23 17:24:32,215 INFO L226 Difference]: Without dead ends: 858 [2021-11-23 17:24:32,216 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 613 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=180, Invalid=812, Unknown=0, NotChecked=0, Total=992 [2021-11-23 17:24:32,217 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 83 mSDsluCounter, 665 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 727 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 99 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:32,217 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 727 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 99 Unchecked, 0.0s Time] [2021-11-23 17:24:32,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 858 states. [2021-11-23 17:24:32,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 858 to 858. [2021-11-23 17:24:32,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 858 states, 857 states have (on average 1.1971995332555425) internal successors, (1026), 857 states have internal predecessors, (1026), 0 states have call successors, (0), 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 17:24:32,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 1026 transitions. [2021-11-23 17:24:32,297 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 1026 transitions. Word has length 106 [2021-11-23 17:24:32,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:32,298 INFO L470 AbstractCegarLoop]: Abstraction has 858 states and 1026 transitions. [2021-11-23 17:24:32,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 12.363636363636363) internal successors, (272), 21 states have internal predecessors, (272), 0 states have call successors, (0), 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 17:24:32,298 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 1026 transitions. [2021-11-23 17:24:32,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:24:32,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:32,299 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:32,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (65)] Ended with exit code 0 [2021-11-23 17:24:32,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2021-11-23 17:24:32,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (64)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:32,900 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:32,900 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:32,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:32,901 INFO L85 PathProgramCache]: Analyzing trace with hash -404838071, now seen corresponding path program 1 times [2021-11-23 17:24:32,901 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:32,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1459471570] [2021-11-23 17:24:32,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:32,901 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:32,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:32,902 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:32,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Waiting until timeout for monitored process [2021-11-23 17:24:33,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:33,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:24:33,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:33,593 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:33,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:33,594 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:33,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1459471570] [2021-11-23 17:24:33,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1459471570] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:33,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:33,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:24:33,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115695442] [2021-11-23 17:24:33,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:33,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:24:33,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:33,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:24:33,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:24:33,596 INFO L87 Difference]: Start difference. First operand 858 states and 1026 transitions. Second operand has 5 states, 5 states have (on average 17.0) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 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 17:24:33,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:33,730 INFO L93 Difference]: Finished difference Result 1803 states and 2242 transitions. [2021-11-23 17:24:33,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:24:33,731 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.0) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 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 107 [2021-11-23 17:24:33,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:33,734 INFO L225 Difference]: With dead ends: 1803 [2021-11-23 17:24:33,734 INFO L226 Difference]: Without dead ends: 1326 [2021-11-23 17:24:33,735 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:24:33,736 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 45 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 40 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:33,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 215 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 40 Unchecked, 0.0s Time] [2021-11-23 17:24:33,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1326 states. [2021-11-23 17:24:33,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1326 to 1310. [2021-11-23 17:24:33,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1310 states, 1309 states have (on average 1.2230710466004584) internal successors, (1601), 1309 states have internal predecessors, (1601), 0 states have call successors, (0), 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 17:24:33,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1310 states to 1310 states and 1601 transitions. [2021-11-23 17:24:33,870 INFO L78 Accepts]: Start accepts. Automaton has 1310 states and 1601 transitions. Word has length 107 [2021-11-23 17:24:33,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:33,870 INFO L470 AbstractCegarLoop]: Abstraction has 1310 states and 1601 transitions. [2021-11-23 17:24:33,871 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.0) internal successors, (85), 4 states have internal predecessors, (85), 0 states have call successors, (0), 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 17:24:33,871 INFO L276 IsEmpty]: Start isEmpty. Operand 1310 states and 1601 transitions. [2021-11-23 17:24:33,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:24:33,872 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:33,872 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 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 17:24:33,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (67)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:34,080 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:34,084 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:34,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:34,085 INFO L85 PathProgramCache]: Analyzing trace with hash -2048006767, now seen corresponding path program 1 times [2021-11-23 17:24:34,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:34,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1565808854] [2021-11-23 17:24:34,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:34,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:34,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:34,087 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:34,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Waiting until timeout for monitored process [2021-11-23 17:24:34,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:34,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:34,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:35,447 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:35,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:35,867 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:35,867 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:35,867 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1565808854] [2021-11-23 17:24:35,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1565808854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:35,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [460803073] [2021-11-23 17:24:35,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:35,868 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:35,868 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:35,869 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:35,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Waiting until timeout for monitored process [2021-11-23 17:24:36,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:36,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:36,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:37,135 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:37,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:37,480 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:37,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [460803073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:37,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878443006] [2021-11-23 17:24:37,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:37,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:37,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:37,482 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:37,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-23 17:24:37,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:37,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:37,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:38,808 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:38,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:39,187 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 17:24:39,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878443006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:39,188 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:39,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:24:39,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22775371] [2021-11-23 17:24:39,189 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:39,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:24:39,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:39,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:24:39,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:24:39,191 INFO L87 Difference]: Start difference. First operand 1310 states and 1601 transitions. Second operand has 16 states, 16 states have (on average 10.75) internal successors, (172), 15 states have internal predecessors, (172), 0 states have call successors, (0), 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 17:24:39,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:39,656 INFO L93 Difference]: Finished difference Result 1940 states and 2395 transitions. [2021-11-23 17:24:39,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 17:24:39,656 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 10.75) internal successors, (172), 15 states have internal predecessors, (172), 0 states have call successors, (0), 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 107 [2021-11-23 17:24:39,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:39,660 INFO L225 Difference]: With dead ends: 1940 [2021-11-23 17:24:39,660 INFO L226 Difference]: Without dead ends: 1523 [2021-11-23 17:24:39,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 624 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:24:39,662 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 117 mSDsluCounter, 711 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 797 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:39,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 797 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 105 Unchecked, 0.0s Time] [2021-11-23 17:24:39,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1523 states. [2021-11-23 17:24:39,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1523 to 1452. [2021-11-23 17:24:39,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1452 states, 1451 states have (on average 1.224672639558925) internal successors, (1777), 1451 states have internal predecessors, (1777), 0 states have call successors, (0), 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 17:24:39,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1452 states to 1452 states and 1777 transitions. [2021-11-23 17:24:39,858 INFO L78 Accepts]: Start accepts. Automaton has 1452 states and 1777 transitions. Word has length 107 [2021-11-23 17:24:39,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:39,858 INFO L470 AbstractCegarLoop]: Abstraction has 1452 states and 1777 transitions. [2021-11-23 17:24:39,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 10.75) internal successors, (172), 15 states have internal predecessors, (172), 0 states have call successors, (0), 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 17:24:39,859 INFO L276 IsEmpty]: Start isEmpty. Operand 1452 states and 1777 transitions. [2021-11-23 17:24:39,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:24:39,861 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:39,861 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 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 17:24:39,896 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (68)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:40,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:40,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (69)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:40,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:40,497 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:40,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:40,497 INFO L85 PathProgramCache]: Analyzing trace with hash -18191274, now seen corresponding path program 1 times [2021-11-23 17:24:40,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:40,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [434046200] [2021-11-23 17:24:40,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:40,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:40,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:40,499 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:40,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Waiting until timeout for monitored process [2021-11-23 17:24:40,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:40,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:40,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:41,488 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:41,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:41,964 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:41,964 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:41,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [434046200] [2021-11-23 17:24:41,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [434046200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:41,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1298864593] [2021-11-23 17:24:41,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:41,965 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:41,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:41,966 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:41,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Waiting until timeout for monitored process [2021-11-23 17:24:42,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:42,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:42,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:42,931 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:42,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:43,313 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:43,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1298864593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:43,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1910996678] [2021-11-23 17:24:43,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:43,314 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:43,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:24:43,315 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:24:43,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-23 17:24:43,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:43,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 17:24:43,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:44,192 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:44,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:44,553 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 32 proven. 22 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-23 17:24:44,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1910996678] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:44,553 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:24:44,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 15 [2021-11-23 17:24:44,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255601249] [2021-11-23 17:24:44,554 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:24:44,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 17:24:44,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:44,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 17:24:44,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-11-23 17:24:44,556 INFO L87 Difference]: Start difference. First operand 1452 states and 1777 transitions. Second operand has 16 states, 16 states have (on average 9.375) internal successors, (150), 15 states have internal predecessors, (150), 0 states have call successors, (0), 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 17:24:44,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:44,957 INFO L93 Difference]: Finished difference Result 3034 states and 3785 transitions. [2021-11-23 17:24:44,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:24:44,957 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 9.375) internal successors, (150), 15 states have internal predecessors, (150), 0 states have call successors, (0), 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 107 [2021-11-23 17:24:44,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:44,962 INFO L225 Difference]: With dead ends: 3034 [2021-11-23 17:24:44,962 INFO L226 Difference]: Without dead ends: 2533 [2021-11-23 17:24:44,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 645 GetRequests, 623 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-11-23 17:24:44,964 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 143 mSDsluCounter, 518 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 598 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:44,964 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 598 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 47 Invalid, 0 Unknown, 100 Unchecked, 0.0s Time] [2021-11-23 17:24:44,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2533 states. [2021-11-23 17:24:45,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2533 to 2491. [2021-11-23 17:24:45,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2491 states, 2490 states have (on average 1.2413654618473895) internal successors, (3091), 2490 states have internal predecessors, (3091), 0 states have call successors, (0), 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 17:24:45,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2491 states to 2491 states and 3091 transitions. [2021-11-23 17:24:45,200 INFO L78 Accepts]: Start accepts. Automaton has 2491 states and 3091 transitions. Word has length 107 [2021-11-23 17:24:45,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:45,200 INFO L470 AbstractCegarLoop]: Abstraction has 2491 states and 3091 transitions. [2021-11-23 17:24:45,200 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 9.375) internal successors, (150), 15 states have internal predecessors, (150), 0 states have call successors, (0), 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 17:24:45,201 INFO L276 IsEmpty]: Start isEmpty. Operand 2491 states and 3091 transitions. [2021-11-23 17:24:45,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:24:45,202 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:45,203 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:24:45,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (72)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:45,411 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (71)] Ended with exit code 0 [2021-11-23 17:24:45,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-23 17:24:45,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:24:45,805 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:45,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:45,806 INFO L85 PathProgramCache]: Analyzing trace with hash 860404460, now seen corresponding path program 1 times [2021-11-23 17:24:45,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:45,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1393041760] [2021-11-23 17:24:45,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:45,807 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:45,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:45,808 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:45,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Waiting until timeout for monitored process [2021-11-23 17:24:45,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:45,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 17:24:45,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:46,523 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-23 17:24:46,524 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 17:24:46,524 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:46,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1393041760] [2021-11-23 17:24:46,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1393041760] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 17:24:46,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 17:24:46,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 17:24:46,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919990033] [2021-11-23 17:24:46,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 17:24:46,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 17:24:46,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:24:46,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 17:24:46,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 17:24:46,526 INFO L87 Difference]: Start difference. First operand 2491 states and 3091 transitions. Second operand has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 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 17:24:46,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:24:46,759 INFO L93 Difference]: Finished difference Result 3002 states and 3735 transitions. [2021-11-23 17:24:46,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 17:24:46,759 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 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 107 [2021-11-23 17:24:46,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:24:46,765 INFO L225 Difference]: With dead ends: 3002 [2021-11-23 17:24:46,765 INFO L226 Difference]: Without dead ends: 2531 [2021-11-23 17:24:46,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-11-23 17:24:46,767 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 47 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:24:46,768 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 216 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 41 Unchecked, 0.0s Time] [2021-11-23 17:24:46,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2531 states. [2021-11-23 17:24:46,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2531 to 2491. [2021-11-23 17:24:46,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2491 states, 2490 states have (on average 1.2305220883534136) internal successors, (3064), 2490 states have internal predecessors, (3064), 0 states have call successors, (0), 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 17:24:46,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2491 states to 2491 states and 3064 transitions. [2021-11-23 17:24:46,989 INFO L78 Accepts]: Start accepts. Automaton has 2491 states and 3064 transitions. Word has length 107 [2021-11-23 17:24:46,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:24:46,989 INFO L470 AbstractCegarLoop]: Abstraction has 2491 states and 3064 transitions. [2021-11-23 17:24:46,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 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 17:24:46,990 INFO L276 IsEmpty]: Start isEmpty. Operand 2491 states and 3064 transitions. [2021-11-23 17:24:46,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:24:46,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:24:46,993 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:24:47,020 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (74)] Ended with exit code 0 [2021-11-23 17:24:47,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:24:47,206 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:24:47,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:24:47,206 INFO L85 PathProgramCache]: Analyzing trace with hash 1748392828, now seen corresponding path program 1 times [2021-11-23 17:24:47,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:24:47,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1997331913] [2021-11-23 17:24:47,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:47,207 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:24:47,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:24:47,208 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:24:47,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 17:24:47,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:47,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:24:47,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:52,099 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:52,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:24:53,974 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:53,974 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:24:53,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1997331913] [2021-11-23 17:24:53,975 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1997331913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:24:53,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1538011734] [2021-11-23 17:24:53,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:24:53,975 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:24:53,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:24:53,976 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:24:53,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 17:24:54,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:24:54,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:24:54,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:24:57,954 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:24:57,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:00,195 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:00,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1538011734] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:00,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773271902] [2021-11-23 17:25:00,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:00,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:00,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:00,197 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:00,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 17:25:00,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:00,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:25:00,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:04,959 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:04,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:06,406 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:06,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773271902] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:06,406 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:06,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 22, 20, 18, 17] total 94 [2021-11-23 17:25:06,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681457355] [2021-11-23 17:25:06,407 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:06,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-23 17:25:06,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:06,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-23 17:25:06,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=8088, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 17:25:06,412 INFO L87 Difference]: Start difference. First operand 2491 states and 3064 transitions. Second operand has 94 states, 94 states have (on average 5.3936170212765955) internal successors, (507), 94 states have internal predecessors, (507), 0 states have call successors, (0), 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 17:25:08,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:08,583 INFO L93 Difference]: Finished difference Result 3208 states and 3945 transitions. [2021-11-23 17:25:08,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-23 17:25:08,585 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 5.3936170212765955) internal successors, (507), 94 states have internal predecessors, (507), 0 states have call successors, (0), 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 107 [2021-11-23 17:25:08,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:08,589 INFO L225 Difference]: With dead ends: 3208 [2021-11-23 17:25:08,589 INFO L226 Difference]: Without dead ends: 2778 [2021-11-23 17:25:08,593 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 544 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4595 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=764, Invalid=8938, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 17:25:08,594 INFO L933 BasicCegarLoop]: 110 mSDtfsCounter, 350 mSDsluCounter, 3492 mSDsCounter, 0 mSdLazyCounter, 850 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 3602 SdHoareTripleChecker+Invalid, 1161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 850 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 281 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:08,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [350 Valid, 3602 Invalid, 1161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 850 Invalid, 0 Unknown, 281 Unchecked, 0.8s Time] [2021-11-23 17:25:08,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2778 states. [2021-11-23 17:25:08,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2778 to 2496. [2021-11-23 17:25:08,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2496 states, 2495 states have (on average 1.230060120240481) internal successors, (3069), 2495 states have internal predecessors, (3069), 0 states have call successors, (0), 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 17:25:08,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2496 states to 2496 states and 3069 transitions. [2021-11-23 17:25:08,838 INFO L78 Accepts]: Start accepts. Automaton has 2496 states and 3069 transitions. Word has length 107 [2021-11-23 17:25:08,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:08,838 INFO L470 AbstractCegarLoop]: Abstraction has 2496 states and 3069 transitions. [2021-11-23 17:25:08,839 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 5.3936170212765955) internal successors, (507), 94 states have internal predecessors, (507), 0 states have call successors, (0), 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 17:25:08,839 INFO L276 IsEmpty]: Start isEmpty. Operand 2496 states and 3069 transitions. [2021-11-23 17:25:08,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:25:08,842 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:08,842 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:25:08,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:09,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Ended with exit code 0 [2021-11-23 17:25:09,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:09,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:09,456 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:09,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:09,457 INFO L85 PathProgramCache]: Analyzing trace with hash 1005504630, now seen corresponding path program 1 times [2021-11-23 17:25:09,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:09,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2053706503] [2021-11-23 17:25:09,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:09,457 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:09,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:09,459 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:09,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 17:25:09,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:09,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:25:09,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:13,726 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 31 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:13,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:16,302 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:16,302 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:16,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2053706503] [2021-11-23 17:25:16,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2053706503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:16,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [862561183] [2021-11-23 17:25:16,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:16,302 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:16,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:16,304 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:16,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 17:25:16,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:16,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:25:16,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:22,863 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:22,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:27,765 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:27,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [862561183] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:27,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738983478] [2021-11-23 17:25:27,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:27,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:27,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:27,766 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:27,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 17:25:27,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:27,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:25:27,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:34,595 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:34,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:37,871 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:37,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738983478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:37,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:37,872 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 30, 30, 31, 31] total 148 [2021-11-23 17:25:37,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323365808] [2021-11-23 17:25:37,872 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:37,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-23 17:25:37,873 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:37,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-23 17:25:37,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1729, Invalid=20027, Unknown=0, NotChecked=0, Total=21756 [2021-11-23 17:25:37,876 INFO L87 Difference]: Start difference. First operand 2496 states and 3069 transitions. Second operand has 148 states, 148 states have (on average 3.4932432432432434) internal successors, (517), 148 states have internal predecessors, (517), 0 states have call successors, (0), 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 17:25:41,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:41,099 INFO L93 Difference]: Finished difference Result 3121 states and 3821 transitions. [2021-11-23 17:25:41,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 17:25:41,100 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 3.4932432432432434) internal successors, (517), 148 states have internal predecessors, (517), 0 states have call successors, (0), 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 107 [2021-11-23 17:25:41,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:41,103 INFO L225 Difference]: With dead ends: 3121 [2021-11-23 17:25:41,103 INFO L226 Difference]: Without dead ends: 2616 [2021-11-23 17:25:41,107 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 651 GetRequests, 495 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11772 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=2120, Invalid=22372, Unknown=0, NotChecked=0, Total=24492 [2021-11-23 17:25:41,108 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 353 mSDsluCounter, 2554 mSDsCounter, 0 mSdLazyCounter, 754 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 353 SdHoareTripleChecker+Valid, 2608 SdHoareTripleChecker+Invalid, 1129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 341 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:41,108 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [353 Valid, 2608 Invalid, 1129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 754 Invalid, 0 Unknown, 341 Unchecked, 0.8s Time] [2021-11-23 17:25:41,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2616 states. [2021-11-23 17:25:41,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2616 to 2448. [2021-11-23 17:25:41,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2448 states, 2447 states have (on average 1.23334695545566) internal successors, (3018), 2447 states have internal predecessors, (3018), 0 states have call successors, (0), 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 17:25:41,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2448 states to 2448 states and 3018 transitions. [2021-11-23 17:25:41,377 INFO L78 Accepts]: Start accepts. Automaton has 2448 states and 3018 transitions. Word has length 107 [2021-11-23 17:25:41,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:41,377 INFO L470 AbstractCegarLoop]: Abstraction has 2448 states and 3018 transitions. [2021-11-23 17:25:41,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 3.4932432432432434) internal successors, (517), 148 states have internal predecessors, (517), 0 states have call successors, (0), 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 17:25:41,377 INFO L276 IsEmpty]: Start isEmpty. Operand 2448 states and 3018 transitions. [2021-11-23 17:25:41,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:25:41,380 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:41,380 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 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 17:25:41,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:41,606 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-23 17:25:41,792 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Ended with exit code 0 [2021-11-23 17:25:41,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:25:41,984 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:41,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:41,984 INFO L85 PathProgramCache]: Analyzing trace with hash -580554192, now seen corresponding path program 1 times [2021-11-23 17:25:41,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:41,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [913037240] [2021-11-23 17:25:41,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:41,985 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:41,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:41,986 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:41,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 17:25:42,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:42,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:42,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:43,848 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:43,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:44,426 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:44,426 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:44,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [913037240] [2021-11-23 17:25:44,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [913037240] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:44,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [756682070] [2021-11-23 17:25:44,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:44,427 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:44,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:44,428 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:44,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 17:25:44,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:44,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:44,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:46,100 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:46,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:46,485 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:46,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [756682070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:46,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770774459] [2021-11-23 17:25:46,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:46,486 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:46,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:46,487 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:46,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 17:25:46,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:46,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:46,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:48,097 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:48,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:48,494 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:48,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770774459] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:48,494 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:48,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:25:48,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842647429] [2021-11-23 17:25:48,495 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:48,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:25:48,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:48,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:25:48,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:25:48,497 INFO L87 Difference]: Start difference. First operand 2448 states and 3018 transitions. Second operand has 26 states, 26 states have (on average 7.769230769230769) internal successors, (202), 25 states have internal predecessors, (202), 0 states have call successors, (0), 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 17:25:49,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:49,212 INFO L93 Difference]: Finished difference Result 3170 states and 3942 transitions. [2021-11-23 17:25:49,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 17:25:49,212 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 7.769230769230769) internal successors, (202), 25 states have internal predecessors, (202), 0 states have call successors, (0), 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 107 [2021-11-23 17:25:49,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:49,216 INFO L225 Difference]: With dead ends: 3170 [2021-11-23 17:25:49,216 INFO L226 Difference]: Without dead ends: 2820 [2021-11-23 17:25:49,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 644 GetRequests, 613 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=151, Invalid=905, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 17:25:49,218 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 168 mSDsluCounter, 1338 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 1431 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 244 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:49,218 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 1431 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 202 Invalid, 0 Unknown, 244 Unchecked, 0.1s Time] [2021-11-23 17:25:49,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2820 states. [2021-11-23 17:25:49,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2820 to 2444. [2021-11-23 17:25:49,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2444 states, 2443 states have (on average 1.2329103561195252) internal successors, (3012), 2443 states have internal predecessors, (3012), 0 states have call successors, (0), 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 17:25:49,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2444 states to 2444 states and 3012 transitions. [2021-11-23 17:25:49,555 INFO L78 Accepts]: Start accepts. Automaton has 2444 states and 3012 transitions. Word has length 107 [2021-11-23 17:25:49,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:49,556 INFO L470 AbstractCegarLoop]: Abstraction has 2444 states and 3012 transitions. [2021-11-23 17:25:49,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 7.769230769230769) internal successors, (202), 25 states have internal predecessors, (202), 0 states have call successors, (0), 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 17:25:49,556 INFO L276 IsEmpty]: Start isEmpty. Operand 2444 states and 3012 transitions. [2021-11-23 17:25:49,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-23 17:25:49,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:49,560 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:25:49,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:49,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:49,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Forceful destruction successful, exit code 0 [2021-11-23 17:25:50,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:50,176 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:50,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:50,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1716287961, now seen corresponding path program 1 times [2021-11-23 17:25:50,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:50,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [840100141] [2021-11-23 17:25:50,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:50,178 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:50,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:50,178 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:50,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-23 17:25:50,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:50,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:25:50,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:51,305 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:25:51,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:51,800 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:25:51,800 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:51,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [840100141] [2021-11-23 17:25:51,801 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [840100141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:51,801 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [755568515] [2021-11-23 17:25:51,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:51,801 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:51,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:51,802 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:51,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-23 17:25:51,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:51,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:25:51,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:52,915 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:25:52,915 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:53,335 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:25:53,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [755568515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:53,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978717591] [2021-11-23 17:25:53,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:53,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:53,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:53,337 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:53,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 17:25:53,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:53,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 17:25:53,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:54,447 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:25:54,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:54,810 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 61 proven. 18 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 17:25:54,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978717591] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:54,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:25:54,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 17 [2021-11-23 17:25:54,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017377639] [2021-11-23 17:25:54,811 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:25:54,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 17:25:54,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:25:54,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 17:25:54,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-11-23 17:25:54,812 INFO L87 Difference]: Start difference. First operand 2444 states and 3012 transitions. Second operand has 18 states, 18 states have (on average 9.333333333333334) internal successors, (168), 17 states have internal predecessors, (168), 0 states have call successors, (0), 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 17:25:55,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:25:55,186 INFO L93 Difference]: Finished difference Result 3306 states and 4106 transitions. [2021-11-23 17:25:55,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 17:25:55,187 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 9.333333333333334) internal successors, (168), 17 states have internal predecessors, (168), 0 states have call successors, (0), 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 107 [2021-11-23 17:25:55,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:25:55,192 INFO L225 Difference]: With dead ends: 3306 [2021-11-23 17:25:55,192 INFO L226 Difference]: Without dead ends: 2353 [2021-11-23 17:25:55,194 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 620 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:25:55,195 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 80 mSDsluCounter, 683 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 102 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:25:55,196 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 759 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 102 Unchecked, 0.0s Time] [2021-11-23 17:25:55,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2353 states. [2021-11-23 17:25:55,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2353 to 2353. [2021-11-23 17:25:55,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2353 states, 2352 states have (on average 1.2300170068027212) internal successors, (2893), 2352 states have internal predecessors, (2893), 0 states have call successors, (0), 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 17:25:55,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2353 states to 2353 states and 2893 transitions. [2021-11-23 17:25:55,553 INFO L78 Accepts]: Start accepts. Automaton has 2353 states and 2893 transitions. Word has length 107 [2021-11-23 17:25:55,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:25:55,554 INFO L470 AbstractCegarLoop]: Abstraction has 2353 states and 2893 transitions. [2021-11-23 17:25:55,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 9.333333333333334) internal successors, (168), 17 states have internal predecessors, (168), 0 states have call successors, (0), 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 17:25:55,554 INFO L276 IsEmpty]: Start isEmpty. Operand 2353 states and 2893 transitions. [2021-11-23 17:25:55,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:25:55,556 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:25:55,556 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:25:55,572 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Ended with exit code 0 [2021-11-23 17:25:55,770 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Ended with exit code 0 [2021-11-23 17:25:55,994 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2021-11-23 17:25:56,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:56,169 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:25:56,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:25:56,170 INFO L85 PathProgramCache]: Analyzing trace with hash 1126267484, now seen corresponding path program 1 times [2021-11-23 17:25:56,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:25:56,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1459402130] [2021-11-23 17:25:56,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:56,171 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:25:56,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:25:56,172 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:25:56,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 17:25:56,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:56,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:25:56,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:57,315 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 26 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:57,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:57,925 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 41 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:57,926 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:25:57,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1459402130] [2021-11-23 17:25:57,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1459402130] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:57,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1756112324] [2021-11-23 17:25:57,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:57,926 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:25:57,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:25:57,930 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:25:57,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-23 17:25:58,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:58,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:25:58,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:25:59,427 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 26 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:59,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:25:59,764 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 41 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:25:59,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1756112324] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:25:59,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292443215] [2021-11-23 17:25:59,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:25:59,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:25:59,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:25:59,765 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:25:59,766 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 17:25:59,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:25:59,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:25:59,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:03,829 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:03,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:04,722 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 41 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:04,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292443215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:04,722 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:04,723 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 15, 11, 21, 15] total 55 [2021-11-23 17:26:04,723 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149911763] [2021-11-23 17:26:04,723 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:04,724 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-23 17:26:04,724 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:04,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-23 17:26:04,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=2615, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 17:26:04,725 INFO L87 Difference]: Start difference. First operand 2353 states and 2893 transitions. Second operand has 55 states, 55 states have (on average 6.6909090909090905) internal successors, (368), 55 states have internal predecessors, (368), 0 states have call successors, (0), 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 17:26:07,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:07,663 INFO L93 Difference]: Finished difference Result 7218 states and 9000 transitions. [2021-11-23 17:26:07,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-23 17:26:07,664 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 6.6909090909090905) internal successors, (368), 55 states have internal predecessors, (368), 0 states have call successors, (0), 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 108 [2021-11-23 17:26:07,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:07,686 INFO L225 Difference]: With dead ends: 7218 [2021-11-23 17:26:07,686 INFO L226 Difference]: Without dead ends: 6273 [2021-11-23 17:26:07,691 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 691 GetRequests, 608 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2179 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=858, Invalid=5784, Unknown=0, NotChecked=0, Total=6642 [2021-11-23 17:26:07,701 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 731 mSDsluCounter, 3546 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 731 SdHoareTripleChecker+Valid, 3696 SdHoareTripleChecker+Invalid, 753 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 367 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:07,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [731 Valid, 3696 Invalid, 753 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 374 Invalid, 0 Unknown, 367 Unchecked, 0.5s Time] [2021-11-23 17:26:07,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6273 states. [2021-11-23 17:26:08,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6273 to 4668. [2021-11-23 17:26:08,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4668 states, 4667 states have (on average 1.2442682665523892) internal successors, (5807), 4667 states have internal predecessors, (5807), 0 states have call successors, (0), 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 17:26:08,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4668 states to 4668 states and 5807 transitions. [2021-11-23 17:26:08,422 INFO L78 Accepts]: Start accepts. Automaton has 4668 states and 5807 transitions. Word has length 108 [2021-11-23 17:26:08,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:08,423 INFO L470 AbstractCegarLoop]: Abstraction has 4668 states and 5807 transitions. [2021-11-23 17:26:08,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 6.6909090909090905) internal successors, (368), 55 states have internal predecessors, (368), 0 states have call successors, (0), 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 17:26:08,423 INFO L276 IsEmpty]: Start isEmpty. Operand 4668 states and 5807 transitions. [2021-11-23 17:26:08,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:26:08,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:08,426 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:26:08,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:08,637 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Ended with exit code 0 [2021-11-23 17:26:08,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:09,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:09,030 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:09,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:09,030 INFO L85 PathProgramCache]: Analyzing trace with hash 383379286, now seen corresponding path program 1 times [2021-11-23 17:26:09,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:09,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [958548077] [2021-11-23 17:26:09,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:09,031 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:09,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:09,032 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:09,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 17:26:09,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:09,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:26:09,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:14,335 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 32 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:14,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:17,413 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:17,413 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:17,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [958548077] [2021-11-23 17:26:17,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [958548077] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:17,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1544918588] [2021-11-23 17:26:17,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:17,414 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:17,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:17,415 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:17,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-23 17:26:17,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:17,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:26:17,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:26,616 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 32 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:26,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:29,246 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:29,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1544918588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:29,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11606010] [2021-11-23 17:26:29,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:29,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:26:29,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:26:29,248 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:26:29,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 17:26:29,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:29,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:26:29,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:35,561 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 32 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:35,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:40,173 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 18 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:40,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11606010] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:40,173 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:26:40,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 32, 24, 24, 24] total 132 [2021-11-23 17:26:40,174 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299266394] [2021-11-23 17:26:40,174 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:26:40,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-23 17:26:40,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:26:40,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-23 17:26:40,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2222, Invalid=15070, Unknown=0, NotChecked=0, Total=17292 [2021-11-23 17:26:40,177 INFO L87 Difference]: Start difference. First operand 4668 states and 5807 transitions. Second operand has 132 states, 132 states have (on average 3.742424242424242) internal successors, (494), 132 states have internal predecessors, (494), 0 states have call successors, (0), 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 17:26:47,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:26:47,456 INFO L93 Difference]: Finished difference Result 7432 states and 9178 transitions. [2021-11-23 17:26:47,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-11-23 17:26:47,457 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.742424242424242) internal successors, (494), 132 states have internal predecessors, (494), 0 states have call successors, (0), 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 108 [2021-11-23 17:26:47,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:26:47,464 INFO L225 Difference]: With dead ends: 7432 [2021-11-23 17:26:47,464 INFO L226 Difference]: Without dead ends: 5669 [2021-11-23 17:26:47,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 514 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9545 ImplicationChecksByTransitivity, 22.9s TimeCoverageRelationStatistics Valid=2740, Invalid=19312, Unknown=0, NotChecked=0, Total=22052 [2021-11-23 17:26:47,469 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 1453 mSDsluCounter, 5592 mSDsCounter, 0 mSdLazyCounter, 1926 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1453 SdHoareTripleChecker+Valid, 5718 SdHoareTripleChecker+Invalid, 2226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 225 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:26:47,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1453 Valid, 5718 Invalid, 2226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 1926 Invalid, 0 Unknown, 225 Unchecked, 2.4s Time] [2021-11-23 17:26:47,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5669 states. [2021-11-23 17:26:48,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5669 to 4710. [2021-11-23 17:26:48,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4710 states, 4709 states have (on average 1.2444255680611596) internal successors, (5860), 4709 states have internal predecessors, (5860), 0 states have call successors, (0), 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 17:26:48,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4710 states to 4710 states and 5860 transitions. [2021-11-23 17:26:48,158 INFO L78 Accepts]: Start accepts. Automaton has 4710 states and 5860 transitions. Word has length 108 [2021-11-23 17:26:48,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:26:48,158 INFO L470 AbstractCegarLoop]: Abstraction has 4710 states and 5860 transitions. [2021-11-23 17:26:48,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.742424242424242) internal successors, (494), 132 states have internal predecessors, (494), 0 states have call successors, (0), 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 17:26:48,159 INFO L276 IsEmpty]: Start isEmpty. Operand 4710 states and 5860 transitions. [2021-11-23 17:26:48,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:26:48,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:26:48,162 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:26:48,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:48,401 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2021-11-23 17:26:48,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Forceful destruction successful, exit code 0 [2021-11-23 17:26:48,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:48,776 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:26:48,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:26:48,777 INFO L85 PathProgramCache]: Analyzing trace with hash -1625057853, now seen corresponding path program 1 times [2021-11-23 17:26:48,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:26:48,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1025407005] [2021-11-23 17:26:48,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:48,777 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:26:48,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:26:48,778 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:26:48,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 17:26:48,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:48,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 17:26:48,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:26:54,188 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 23 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:54,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:26:56,120 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:26:56,121 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:26:56,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1025407005] [2021-11-23 17:26:56,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1025407005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:26:56,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [426514623] [2021-11-23 17:26:56,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:26:56,122 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:26:56,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:26:56,122 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:26:56,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2021-11-23 17:26:56,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:26:56,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 17:26:56,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:00,554 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 23 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:00,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:02,844 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:02,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [426514623] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:02,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790276322] [2021-11-23 17:27:02,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:02,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:02,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:02,846 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:27:02,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 17:27:02,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:02,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:27:02,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:07,602 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:07,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:09,192 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:09,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790276322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:09,193 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:09,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 20, 22, 20, 18, 17] total 94 [2021-11-23 17:27:09,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242370972] [2021-11-23 17:27:09,193 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:09,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-23 17:27:09,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:09,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-23 17:27:09,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=8088, Unknown=0, NotChecked=0, Total=8742 [2021-11-23 17:27:09,195 INFO L87 Difference]: Start difference. First operand 4710 states and 5860 transitions. Second operand has 94 states, 94 states have (on average 5.446808510638298) internal successors, (512), 94 states have internal predecessors, (512), 0 states have call successors, (0), 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 17:27:12,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:12,475 INFO L93 Difference]: Finished difference Result 7608 states and 9433 transitions. [2021-11-23 17:27:12,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-23 17:27:12,476 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 5.446808510638298) internal successors, (512), 94 states have internal predecessors, (512), 0 states have call successors, (0), 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 108 [2021-11-23 17:27:12,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:12,482 INFO L225 Difference]: With dead ends: 7608 [2021-11-23 17:27:12,482 INFO L226 Difference]: Without dead ends: 5948 [2021-11-23 17:27:12,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 551 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4922 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=801, Invalid=9911, Unknown=0, NotChecked=0, Total=10712 [2021-11-23 17:27:12,485 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 474 mSDsluCounter, 4020 mSDsCounter, 0 mSdLazyCounter, 954 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 4150 SdHoareTripleChecker+Invalid, 1209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 954 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 223 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:12,486 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [474 Valid, 4150 Invalid, 1209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 954 Invalid, 0 Unknown, 223 Unchecked, 1.0s Time] [2021-11-23 17:27:12,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5948 states. [2021-11-23 17:27:13,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5948 to 4711. [2021-11-23 17:27:13,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4711 states, 4710 states have (on average 1.2443736730360935) internal successors, (5861), 4710 states have internal predecessors, (5861), 0 states have call successors, (0), 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 17:27:13,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4711 states to 4711 states and 5861 transitions. [2021-11-23 17:27:13,085 INFO L78 Accepts]: Start accepts. Automaton has 4711 states and 5861 transitions. Word has length 108 [2021-11-23 17:27:13,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:13,085 INFO L470 AbstractCegarLoop]: Abstraction has 4711 states and 5861 transitions. [2021-11-23 17:27:13,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 5.446808510638298) internal successors, (512), 94 states have internal predecessors, (512), 0 states have call successors, (0), 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 17:27:13,086 INFO L276 IsEmpty]: Start isEmpty. Operand 4711 states and 5861 transitions. [2021-11-23 17:27:13,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:27:13,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:13,089 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:27:13,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:13,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:13,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:13,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:13,704 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:13,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:13,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1927021245, now seen corresponding path program 1 times [2021-11-23 17:27:13,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:13,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1805411781] [2021-11-23 17:27:13,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:13,705 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:13,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:13,706 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:13,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 17:27:13,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:13,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:27:13,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:14,645 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 51 proven. 32 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:14,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:15,034 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 62 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:27:15,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:15,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1805411781] [2021-11-23 17:27:15,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1805411781] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:15,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [442114284] [2021-11-23 17:27:15,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:15,035 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:15,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:15,035 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:15,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2021-11-23 17:27:15,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:15,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:27:15,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:19,327 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 31 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:19,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:20,648 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 46 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:20,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [442114284] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:20,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305985425] [2021-11-23 17:27:20,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:20,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:20,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:20,649 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:27:20,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 17:27:20,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:20,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:27:20,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:25,491 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 31 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:25,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:28,249 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 39 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:28,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [305985425] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:28,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:28,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 27, 17, 26, 21] total 98 [2021-11-23 17:27:28,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954554394] [2021-11-23 17:27:28,250 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:28,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-23 17:27:28,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:28,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-23 17:27:28,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1417, Invalid=8089, Unknown=0, NotChecked=0, Total=9506 [2021-11-23 17:27:28,252 INFO L87 Difference]: Start difference. First operand 4711 states and 5861 transitions. Second operand has 98 states, 98 states have (on average 4.969387755102041) internal successors, (487), 98 states have internal predecessors, (487), 0 states have call successors, (0), 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 17:27:44,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:44,532 INFO L93 Difference]: Finished difference Result 17349 states and 21676 transitions. [2021-11-23 17:27:44,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-23 17:27:44,533 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 4.969387755102041) internal successors, (487), 98 states have internal predecessors, (487), 0 states have call successors, (0), 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 108 [2021-11-23 17:27:44,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:44,549 INFO L225 Difference]: With dead ends: 17349 [2021-11-23 17:27:44,550 INFO L226 Difference]: Without dead ends: 15645 [2021-11-23 17:27:44,555 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 803 GetRequests, 604 SyntacticMatches, 0 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14496 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=4112, Invalid=36088, Unknown=0, NotChecked=0, Total=40200 [2021-11-23 17:27:44,556 INFO L933 BasicCegarLoop]: 746 mSDtfsCounter, 2284 mSDsluCounter, 19608 mSDsCounter, 0 mSdLazyCounter, 2771 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2284 SdHoareTripleChecker+Valid, 20354 SdHoareTripleChecker+Invalid, 4220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 2771 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1398 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:44,556 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2284 Valid, 20354 Invalid, 4220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 2771 Invalid, 0 Unknown, 1398 Unchecked, 3.2s Time] [2021-11-23 17:27:44,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15645 states. [2021-11-23 17:27:45,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15645 to 6952. [2021-11-23 17:27:45,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6952 states, 6951 states have (on average 1.2478780031650123) internal successors, (8674), 6951 states have internal predecessors, (8674), 0 states have call successors, (0), 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 17:27:45,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6952 states to 6952 states and 8674 transitions. [2021-11-23 17:27:45,710 INFO L78 Accepts]: Start accepts. Automaton has 6952 states and 8674 transitions. Word has length 108 [2021-11-23 17:27:45,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:45,711 INFO L470 AbstractCegarLoop]: Abstraction has 6952 states and 8674 transitions. [2021-11-23 17:27:45,711 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 4.969387755102041) internal successors, (487), 98 states have internal predecessors, (487), 0 states have call successors, (0), 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 17:27:45,711 INFO L276 IsEmpty]: Start isEmpty. Operand 6952 states and 8674 transitions. [2021-11-23 17:27:45,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:27:45,713 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:45,714 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:27:45,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:45,947 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:46,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:46,324 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:46,325 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:46,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:46,325 INFO L85 PathProgramCache]: Analyzing trace with hash 129869566, now seen corresponding path program 1 times [2021-11-23 17:27:46,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:46,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [628399959] [2021-11-23 17:27:46,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:46,326 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:46,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:46,328 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:46,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 17:27:46,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:46,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:27:46,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:48,229 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:48,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:48,820 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:48,820 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:27:48,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [628399959] [2021-11-23 17:27:48,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [628399959] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:48,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [326174056] [2021-11-23 17:27:48,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:48,824 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:27:48,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:27:48,825 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:27:48,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 17:27:49,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:49,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:27:49,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:50,619 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:50,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:51,079 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:51,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [326174056] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:51,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531889917] [2021-11-23 17:27:51,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:51,079 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:51,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:27:51,081 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:27:51,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 17:27:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:51,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:27:51,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:27:52,860 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:52,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:27:53,276 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:27:53,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531889917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:27:53,277 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:27:53,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 13] total 25 [2021-11-23 17:27:53,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078837796] [2021-11-23 17:27:53,277 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:27:53,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 17:27:53,278 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:27:53,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 17:27:53,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2021-11-23 17:27:53,278 INFO L87 Difference]: Start difference. First operand 6952 states and 8674 transitions. Second operand has 26 states, 26 states have (on average 7.846153846153846) internal successors, (204), 25 states have internal predecessors, (204), 0 states have call successors, (0), 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 17:27:55,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:27:55,983 INFO L93 Difference]: Finished difference Result 11880 states and 14902 transitions. [2021-11-23 17:27:55,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 17:27:55,984 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 7.846153846153846) internal successors, (204), 25 states have internal predecessors, (204), 0 states have call successors, (0), 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 108 [2021-11-23 17:27:55,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:27:55,991 INFO L225 Difference]: With dead ends: 11880 [2021-11-23 17:27:55,991 INFO L226 Difference]: Without dead ends: 7557 [2021-11-23 17:27:55,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 679 GetRequests, 623 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=398, Invalid=2908, Unknown=0, NotChecked=0, Total=3306 [2021-11-23 17:27:55,996 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 371 mSDsluCounter, 2179 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 2310 SdHoareTripleChecker+Invalid, 1478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 940 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:27:55,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [371 Valid, 2310 Invalid, 1478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 504 Invalid, 0 Unknown, 940 Unchecked, 0.4s Time] [2021-11-23 17:27:56,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7557 states. [2021-11-23 17:27:56,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7557 to 5379. [2021-11-23 17:27:56,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5379 states, 5378 states have (on average 1.208627742655262) internal successors, (6500), 5378 states have internal predecessors, (6500), 0 states have call successors, (0), 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 17:27:56,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5379 states to 5379 states and 6500 transitions. [2021-11-23 17:27:56,886 INFO L78 Accepts]: Start accepts. Automaton has 5379 states and 6500 transitions. Word has length 108 [2021-11-23 17:27:56,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:27:56,886 INFO L470 AbstractCegarLoop]: Abstraction has 5379 states and 6500 transitions. [2021-11-23 17:27:56,886 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 7.846153846153846) internal successors, (204), 25 states have internal predecessors, (204), 0 states have call successors, (0), 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 17:27:56,887 INFO L276 IsEmpty]: Start isEmpty. Operand 5379 states and 6500 transitions. [2021-11-23 17:27:56,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:27:56,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:27:56,889 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 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 17:27:56,906 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:57,099 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Ended with exit code 0 [2021-11-23 17:27:57,317 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Forceful destruction successful, exit code 0 [2021-11-23 17:27:57,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:27:57,492 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:27:57,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:27:57,492 INFO L85 PathProgramCache]: Analyzing trace with hash 785247971, now seen corresponding path program 1 times [2021-11-23 17:27:57,493 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:27:57,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [929519421] [2021-11-23 17:27:57,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:27:57,493 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:27:57,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:27:57,494 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:27:57,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 17:27:57,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:27:57,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:27:57,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:03,884 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:03,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:06,442 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:06,442 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:28:06,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [929519421] [2021-11-23 17:28:06,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [929519421] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:06,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2074528544] [2021-11-23 17:28:06,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:06,442 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:28:06,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:28:06,443 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:28:06,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 17:28:06,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:06,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:28:06,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:14,729 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 31 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:14,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:20,523 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:20,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2074528544] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:20,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917656272] [2021-11-23 17:28:20,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:28:20,523 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:28:20,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:28:20,524 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:28:20,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 17:28:20,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:28:20,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:28:20,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:28:24,633 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:24,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:28:26,462 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 13 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:28:26,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917656272] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:28:26,462 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:28:26,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 31, 30, 18, 17] total 116 [2021-11-23 17:28:26,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133135331] [2021-11-23 17:28:26,463 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:28:26,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-23 17:28:26,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:28:26,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-23 17:28:26,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1279, Invalid=12061, Unknown=0, NotChecked=0, Total=13340 [2021-11-23 17:28:26,465 INFO L87 Difference]: Start difference. First operand 5379 states and 6500 transitions. Second operand has 116 states, 116 states have (on average 4.344827586206897) internal successors, (504), 116 states have internal predecessors, (504), 0 states have call successors, (0), 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 17:29:06,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:06,452 INFO L93 Difference]: Finished difference Result 12534 states and 15133 transitions. [2021-11-23 17:29:06,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-11-23 17:29:06,453 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 4.344827586206897) internal successors, (504), 116 states have internal predecessors, (504), 0 states have call successors, (0), 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 108 [2021-11-23 17:29:06,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:06,464 INFO L225 Difference]: With dead ends: 12534 [2021-11-23 17:29:06,464 INFO L226 Difference]: Without dead ends: 10193 [2021-11-23 17:29:06,470 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 537 SyntacticMatches, 1 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10671 ImplicationChecksByTransitivity, 49.9s TimeCoverageRelationStatistics Valid=2863, Invalid=27937, Unknown=0, NotChecked=0, Total=30800 [2021-11-23 17:29:06,470 INFO L933 BasicCegarLoop]: 177 mSDtfsCounter, 1624 mSDsluCounter, 8546 mSDsCounter, 0 mSdLazyCounter, 2593 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1624 SdHoareTripleChecker+Valid, 8723 SdHoareTripleChecker+Invalid, 3648 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 2593 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 920 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:06,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1624 Valid, 8723 Invalid, 3648 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 2593 Invalid, 0 Unknown, 920 Unchecked, 4.2s Time] [2021-11-23 17:29:06,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10193 states. [2021-11-23 17:29:07,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10193 to 6993. [2021-11-23 17:29:07,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6993 states, 6992 states have (on average 1.209096109839817) internal successors, (8454), 6992 states have internal predecessors, (8454), 0 states have call successors, (0), 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 17:29:07,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6993 states to 6993 states and 8454 transitions. [2021-11-23 17:29:07,840 INFO L78 Accepts]: Start accepts. Automaton has 6993 states and 8454 transitions. Word has length 108 [2021-11-23 17:29:07,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:07,841 INFO L470 AbstractCegarLoop]: Abstraction has 6993 states and 8454 transitions. [2021-11-23 17:29:07,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 4.344827586206897) internal successors, (504), 116 states have internal predecessors, (504), 0 states have call successors, (0), 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 17:29:07,841 INFO L276 IsEmpty]: Start isEmpty. Operand 6993 states and 8454 transitions. [2021-11-23 17:29:07,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-23 17:29:07,842 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:07,843 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:29:07,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:08,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Ended with exit code 0 [2021-11-23 17:29:08,268 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 17:29:08,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:08,444 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:08,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:08,445 INFO L85 PathProgramCache]: Analyzing trace with hash 42359773, now seen corresponding path program 1 times [2021-11-23 17:29:08,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:08,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [988242203] [2021-11-23 17:29:08,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:08,445 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:08,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:08,446 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:08,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 17:29:08,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:08,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:29:08,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:12,922 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:12,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:15,507 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:15,507 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:15,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [988242203] [2021-11-23 17:29:15,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [988242203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:15,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [648696579] [2021-11-23 17:29:15,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:15,508 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:15,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:15,509 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:15,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 17:29:15,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:15,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:29:15,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:22,281 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:22,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:27,202 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:27,203 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [648696579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:27,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501165566] [2021-11-23 17:29:27,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:27,203 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:27,203 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:27,204 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:27,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 17:29:27,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:27,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 17:29:27,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:32,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:33,141 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:33,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501165566] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:33,142 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:33,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 32, 31, 26, 26] total 125 [2021-11-23 17:29:33,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502562845] [2021-11-23 17:29:33,142 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:33,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-23 17:29:33,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:33,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-23 17:29:33,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=973, Invalid=14527, Unknown=0, NotChecked=0, Total=15500 [2021-11-23 17:29:33,145 INFO L87 Difference]: Start difference. First operand 6993 states and 8454 transitions. Second operand has 125 states, 125 states have (on average 3.544) internal successors, (443), 125 states have internal predecessors, (443), 0 states have call successors, (0), 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 17:29:43,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:29:43,839 INFO L93 Difference]: Finished difference Result 10117 states and 12272 transitions. [2021-11-23 17:29:43,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 17:29:43,840 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.544) internal successors, (443), 125 states have internal predecessors, (443), 0 states have call successors, (0), 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 108 [2021-11-23 17:29:43,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:29:43,848 INFO L225 Difference]: With dead ends: 10117 [2021-11-23 17:29:43,849 INFO L226 Difference]: Without dead ends: 8631 [2021-11-23 17:29:43,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 683 GetRequests, 525 SyntacticMatches, 4 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9872 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=1726, Invalid=22454, Unknown=0, NotChecked=0, Total=24180 [2021-11-23 17:29:43,852 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 928 mSDsluCounter, 5986 mSDsCounter, 0 mSdLazyCounter, 1703 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 928 SdHoareTripleChecker+Valid, 6119 SdHoareTripleChecker+Invalid, 2509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1703 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 755 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:29:43,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [928 Valid, 6119 Invalid, 2509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1703 Invalid, 0 Unknown, 755 Unchecked, 1.7s Time] [2021-11-23 17:29:43,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8631 states. [2021-11-23 17:29:45,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8631 to 7065. [2021-11-23 17:29:45,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7065 states, 7064 states have (on average 1.2085220838052095) internal successors, (8537), 7064 states have internal predecessors, (8537), 0 states have call successors, (0), 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 17:29:45,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7065 states to 7065 states and 8537 transitions. [2021-11-23 17:29:45,080 INFO L78 Accepts]: Start accepts. Automaton has 7065 states and 8537 transitions. Word has length 108 [2021-11-23 17:29:45,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:29:45,080 INFO L470 AbstractCegarLoop]: Abstraction has 7065 states and 8537 transitions. [2021-11-23 17:29:45,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.544) internal successors, (443), 125 states have internal predecessors, (443), 0 states have call successors, (0), 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 17:29:45,080 INFO L276 IsEmpty]: Start isEmpty. Operand 7065 states and 8537 transitions. [2021-11-23 17:29:45,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:29:45,081 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:29:45,082 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:29:45,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:45,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 17:29:45,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Forceful destruction successful, exit code 0 [2021-11-23 17:29:45,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:29:45,683 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:29:45,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:29:45,683 INFO L85 PathProgramCache]: Analyzing trace with hash 563892963, now seen corresponding path program 1 times [2021-11-23 17:29:45,683 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:29:45,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1235949919] [2021-11-23 17:29:45,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:45,684 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:29:45,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:29:45,685 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:29:45,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 17:29:45,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:45,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:29:45,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:46,143 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 30 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:46,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:46,408 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 30 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:46,408 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:29:46,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1235949919] [2021-11-23 17:29:46,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1235949919] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:46,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [730369332] [2021-11-23 17:29:46,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:46,409 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:29:46,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:29:46,411 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:29:46,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 17:29:46,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:46,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 17:29:46,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:48,901 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 26 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:48,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:49,478 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 17:29:49,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [730369332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:49,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052084822] [2021-11-23 17:29:49,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:29:49,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:29:49,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:29:49,479 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:29:49,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 17:29:49,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:29:49,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 17:29:49,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:29:54,111 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 23 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:54,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:29:55,671 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 13 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:29:55,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052084822] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:29:55,671 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:29:55,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15, 13, 20, 17] total 66 [2021-11-23 17:29:55,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722539105] [2021-11-23 17:29:55,671 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:29:55,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-23 17:29:55,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:29:55,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-23 17:29:55,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=3758, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 17:29:55,673 INFO L87 Difference]: Start difference. First operand 7065 states and 8537 transitions. Second operand has 66 states, 66 states have (on average 7.0) internal successors, (462), 66 states have internal predecessors, (462), 0 states have call successors, (0), 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 17:30:02,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:02,172 INFO L93 Difference]: Finished difference Result 14176 states and 17223 transitions. [2021-11-23 17:30:02,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-23 17:30:02,172 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 7.0) internal successors, (462), 66 states have internal predecessors, (462), 0 states have call successors, (0), 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 109 [2021-11-23 17:30:02,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:02,184 INFO L225 Difference]: With dead ends: 14176 [2021-11-23 17:30:02,184 INFO L226 Difference]: Without dead ends: 10811 [2021-11-23 17:30:02,190 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 748 GetRequests, 615 SyntacticMatches, 27 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 5389 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1804, Invalid=9752, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 17:30:02,190 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 854 mSDsluCounter, 4419 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 854 SdHoareTripleChecker+Valid, 4550 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 902 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:02,190 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [854 Valid, 4550 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 881 Invalid, 0 Unknown, 902 Unchecked, 0.7s Time] [2021-11-23 17:30:02,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10811 states. [2021-11-23 17:30:04,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10811 to 10163. [2021-11-23 17:30:04,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10163 states, 10162 states have (on average 1.2127533950009841) internal successors, (12324), 10162 states have internal predecessors, (12324), 0 states have call successors, (0), 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 17:30:04,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10163 states to 10163 states and 12324 transitions. [2021-11-23 17:30:04,073 INFO L78 Accepts]: Start accepts. Automaton has 10163 states and 12324 transitions. Word has length 109 [2021-11-23 17:30:04,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:04,073 INFO L470 AbstractCegarLoop]: Abstraction has 10163 states and 12324 transitions. [2021-11-23 17:30:04,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 7.0) internal successors, (462), 66 states have internal predecessors, (462), 0 states have call successors, (0), 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 17:30:04,074 INFO L276 IsEmpty]: Start isEmpty. Operand 10163 states and 12324 transitions. [2021-11-23 17:30:04,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:30:04,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:04,075 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:30:04,086 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:04,277 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Ended with exit code 0 [2021-11-23 17:30:04,496 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-23 17:30:04,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:04,676 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:04,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:04,676 INFO L85 PathProgramCache]: Analyzing trace with hash -178995235, now seen corresponding path program 1 times [2021-11-23 17:30:04,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:04,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1276078105] [2021-11-23 17:30:04,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:04,677 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:04,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:04,678 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:04,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 17:30:04,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:04,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 17:30:04,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:05,979 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:05,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:07,402 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:07,402 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:07,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1276078105] [2021-11-23 17:30:07,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1276078105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:07,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1535146247] [2021-11-23 17:30:07,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:07,402 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:07,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:07,403 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:07,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 17:30:07,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:07,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:30:07,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:15,014 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 32 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:15,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:16,715 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 46 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:16,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1535146247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:16,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327722349] [2021-11-23 17:30:16,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:16,716 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:16,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:16,716 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:16,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 17:30:16,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:16,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 17:30:16,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:20,902 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 47 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:20,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:24,068 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 39 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:24,068 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327722349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:24,068 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:24,068 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 32, 19, 20, 19] total 109 [2021-11-23 17:30:24,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038160748] [2021-11-23 17:30:24,068 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:24,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-23 17:30:24,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:24,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-23 17:30:24,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1421, Invalid=10351, Unknown=0, NotChecked=0, Total=11772 [2021-11-23 17:30:24,070 INFO L87 Difference]: Start difference. First operand 10163 states and 12324 transitions. Second operand has 109 states, 109 states have (on average 4.486238532110092) internal successors, (489), 109 states have internal predecessors, (489), 0 states have call successors, (0), 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 17:30:34,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:34,654 INFO L93 Difference]: Finished difference Result 21522 states and 26070 transitions. [2021-11-23 17:30:34,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-23 17:30:34,655 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 4.486238532110092) internal successors, (489), 109 states have internal predecessors, (489), 0 states have call successors, (0), 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 109 [2021-11-23 17:30:34,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:34,670 INFO L225 Difference]: With dead ends: 21522 [2021-11-23 17:30:34,670 INFO L226 Difference]: Without dead ends: 14112 [2021-11-23 17:30:34,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 718 GetRequests, 559 SyntacticMatches, 8 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 8373 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=3140, Invalid=20116, Unknown=0, NotChecked=0, Total=23256 [2021-11-23 17:30:34,678 INFO L933 BasicCegarLoop]: 119 mSDtfsCounter, 1679 mSDsluCounter, 5482 mSDsCounter, 0 mSdLazyCounter, 678 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1679 SdHoareTripleChecker+Valid, 5601 SdHoareTripleChecker+Invalid, 1440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 751 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:34,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1679 Valid, 5601 Invalid, 1440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 678 Invalid, 0 Unknown, 751 Unchecked, 0.7s Time] [2021-11-23 17:30:34,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14112 states. [2021-11-23 17:30:37,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14112 to 12741. [2021-11-23 17:30:37,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12741 states, 12740 states have (on average 1.2111459968602827) internal successors, (15430), 12740 states have internal predecessors, (15430), 0 states have call successors, (0), 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 17:30:37,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12741 states to 12741 states and 15430 transitions. [2021-11-23 17:30:37,140 INFO L78 Accepts]: Start accepts. Automaton has 12741 states and 15430 transitions. Word has length 109 [2021-11-23 17:30:37,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:37,140 INFO L470 AbstractCegarLoop]: Abstraction has 12741 states and 15430 transitions. [2021-11-23 17:30:37,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 4.486238532110092) internal successors, (489), 109 states have internal predecessors, (489), 0 states have call successors, (0), 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 17:30:37,141 INFO L276 IsEmpty]: Start isEmpty. Operand 12741 states and 15430 transitions. [2021-11-23 17:30:37,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:30:37,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:37,143 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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] [2021-11-23 17:30:37,200 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:37,378 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:37,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:37,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:37,772 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:37,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:37,773 INFO L85 PathProgramCache]: Analyzing trace with hash -977761770, now seen corresponding path program 1 times [2021-11-23 17:30:37,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:37,773 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [123034466] [2021-11-23 17:30:37,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:37,773 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:37,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:37,774 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:37,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2021-11-23 17:30:37,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:37,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:30:37,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:41,090 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 28 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:41,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:41,932 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 28 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:41,933 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:30:41,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [123034466] [2021-11-23 17:30:41,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [123034466] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:41,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [526356371] [2021-11-23 17:30:41,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:41,933 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:30:41,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:30:41,934 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:30:41,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Waiting until timeout for monitored process [2021-11-23 17:30:42,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:42,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:30:42,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:45,153 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:45,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:46,976 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:46,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [526356371] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:46,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689942705] [2021-11-23 17:30:46,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:46,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:30:46,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:30:46,977 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:30:46,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-23 17:30:47,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:47,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:30:47,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:30:49,899 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:49,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:30:50,774 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:30:50,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689942705] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:30:50,774 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:30:50,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17, 19, 18, 18, 18] total 77 [2021-11-23 17:30:50,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068199790] [2021-11-23 17:30:50,775 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:30:50,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-23 17:30:50,775 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:30:50,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-23 17:30:50,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=5460, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 17:30:50,777 INFO L87 Difference]: Start difference. First operand 12741 states and 15430 transitions. Second operand has 77 states, 77 states have (on average 5.87012987012987) internal successors, (452), 77 states have internal predecessors, (452), 0 states have call successors, (0), 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 17:30:56,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:30:56,098 INFO L93 Difference]: Finished difference Result 17588 states and 21346 transitions. [2021-11-23 17:30:56,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 17:30:56,099 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 5.87012987012987) internal successors, (452), 77 states have internal predecessors, (452), 0 states have call successors, (0), 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 109 [2021-11-23 17:30:56,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:30:56,113 INFO L225 Difference]: With dead ends: 17588 [2021-11-23 17:30:56,113 INFO L226 Difference]: Without dead ends: 14191 [2021-11-23 17:30:56,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 578 SyntacticMatches, 3 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=622, Invalid=7934, Unknown=0, NotChecked=0, Total=8556 [2021-11-23 17:30:56,119 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 384 mSDsluCounter, 3151 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 3262 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 461 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:30:56,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [384 Valid, 3262 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 512 Invalid, 0 Unknown, 461 Unchecked, 0.4s Time] [2021-11-23 17:30:56,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14191 states. [2021-11-23 17:30:58,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14191 to 12697. [2021-11-23 17:30:58,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12697 states, 12696 states have (on average 1.2113264020163832) internal successors, (15379), 12696 states have internal predecessors, (15379), 0 states have call successors, (0), 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 17:30:58,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12697 states to 12697 states and 15379 transitions. [2021-11-23 17:30:58,560 INFO L78 Accepts]: Start accepts. Automaton has 12697 states and 15379 transitions. Word has length 109 [2021-11-23 17:30:58,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:30:58,561 INFO L470 AbstractCegarLoop]: Abstraction has 12697 states and 15379 transitions. [2021-11-23 17:30:58,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 5.87012987012987) internal successors, (452), 77 states have internal predecessors, (452), 0 states have call successors, (0), 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 17:30:58,561 INFO L276 IsEmpty]: Start isEmpty. Operand 12697 states and 15379 transitions. [2021-11-23 17:30:58,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:30:58,562 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:30:58,562 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 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] [2021-11-23 17:30:58,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:58,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2021-11-23 17:30:58,970 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Ended with exit code 0 [2021-11-23 17:30:59,163 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:30:59,163 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:30:59,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:30:59,164 INFO L85 PathProgramCache]: Analyzing trace with hash -987714894, now seen corresponding path program 1 times [2021-11-23 17:30:59,164 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:30:59,164 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1186382891] [2021-11-23 17:30:59,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:30:59,164 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:30:59,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:30:59,165 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:30:59,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2021-11-23 17:30:59,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:30:59,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:30:59,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:02,926 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:02,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:04,581 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:04,582 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:04,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1186382891] [2021-11-23 17:31:04,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1186382891] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:04,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [652516535] [2021-11-23 17:31:04,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:04,582 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:04,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:04,583 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:04,584 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Waiting until timeout for monitored process [2021-11-23 17:31:04,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:04,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 17:31:04,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:08,129 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:08,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:08,754 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:08,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [652516535] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:08,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709773924] [2021-11-23 17:31:08,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:08,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:08,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:08,755 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:08,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-23 17:31:08,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:08,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 17:31:08,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:13,578 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:13,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:14,504 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 19 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:14,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709773924] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:14,504 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:14,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 18, 18, 17] total 51 [2021-11-23 17:31:14,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167882097] [2021-11-23 17:31:14,505 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:14,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 17:31:14,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:14,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 17:31:14,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2336, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 17:31:14,506 INFO L87 Difference]: Start difference. First operand 12697 states and 15379 transitions. Second operand has 51 states, 51 states have (on average 5.549019607843137) internal successors, (283), 51 states have internal predecessors, (283), 0 states have call successors, (0), 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 17:31:17,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:17,080 INFO L93 Difference]: Finished difference Result 16186 states and 19738 transitions. [2021-11-23 17:31:17,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 17:31:17,081 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.549019607843137) internal successors, (283), 51 states have internal predecessors, (283), 0 states have call successors, (0), 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 109 [2021-11-23 17:31:17,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:17,096 INFO L225 Difference]: With dead ends: 16186 [2021-11-23 17:31:17,096 INFO L226 Difference]: Without dead ends: 12726 [2021-11-23 17:31:17,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 598 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=245, Invalid=2511, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 17:31:17,102 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 85 mSDsluCounter, 1766 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1848 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 191 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:17,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 1848 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 109 Invalid, 0 Unknown, 191 Unchecked, 0.1s Time] [2021-11-23 17:31:17,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12726 states. [2021-11-23 17:31:19,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12726 to 12693. [2021-11-23 17:31:19,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12693 states, 12692 states have (on average 1.2113142136779074) internal successors, (15374), 12692 states have internal predecessors, (15374), 0 states have call successors, (0), 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 17:31:19,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12693 states to 12693 states and 15374 transitions. [2021-11-23 17:31:19,509 INFO L78 Accepts]: Start accepts. Automaton has 12693 states and 15374 transitions. Word has length 109 [2021-11-23 17:31:19,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:31:19,509 INFO L470 AbstractCegarLoop]: Abstraction has 12693 states and 15374 transitions. [2021-11-23 17:31:19,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.549019607843137) internal successors, (283), 51 states have internal predecessors, (283), 0 states have call successors, (0), 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 17:31:19,509 INFO L276 IsEmpty]: Start isEmpty. Operand 12693 states and 15374 transitions. [2021-11-23 17:31:19,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:31:19,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:31:19,511 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:31:19,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:19,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Forceful destruction successful, exit code 0 [2021-11-23 17:31:19,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2021-11-23 17:31:20,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:20,112 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:31:20,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:31:20,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1333547989, now seen corresponding path program 1 times [2021-11-23 17:31:20,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:31:20,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1392344292] [2021-11-23 17:31:20,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:20,112 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:31:20,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:31:20,113 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:31:20,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Waiting until timeout for monitored process [2021-11-23 17:31:20,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:20,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 17:31:20,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 26 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:21,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:21,765 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 41 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:21,765 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:31:21,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1392344292] [2021-11-23 17:31:21,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1392344292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:21,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1514750728] [2021-11-23 17:31:21,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:21,765 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:31:21,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:31:21,766 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:31:21,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (121)] Waiting until timeout for monitored process [2021-11-23 17:31:21,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:21,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:31:21,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:34,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:38,018 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 30 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:38,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1514750728] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:38,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717711045] [2021-11-23 17:31:38,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:31:38,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:31:38,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:31:38,020 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:31:38,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-23 17:31:38,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:31:38,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 17:31:38,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:31:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 26 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:43,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:31:44,758 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 30 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:31:44,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717711045] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:31:44,758 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:31:44,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 35, 26, 20, 15] total 106 [2021-11-23 17:31:44,759 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719262703] [2021-11-23 17:31:44,759 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:31:44,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-23 17:31:44,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:31:44,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-23 17:31:44,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1396, Invalid=9734, Unknown=0, NotChecked=0, Total=11130 [2021-11-23 17:31:44,761 INFO L87 Difference]: Start difference. First operand 12693 states and 15374 transitions. Second operand has 106 states, 106 states have (on average 5.056603773584905) internal successors, (536), 106 states have internal predecessors, (536), 0 states have call successors, (0), 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 17:31:59,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:31:59,606 INFO L93 Difference]: Finished difference Result 27959 states and 33886 transitions. [2021-11-23 17:31:59,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2021-11-23 17:31:59,607 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 5.056603773584905) internal successors, (536), 106 states have internal predecessors, (536), 0 states have call successors, (0), 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 109 [2021-11-23 17:31:59,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:31:59,627 INFO L225 Difference]: With dead ends: 27959 [2021-11-23 17:31:59,627 INFO L226 Difference]: Without dead ends: 18715 [2021-11-23 17:31:59,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 10 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12169 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=3668, Invalid=25744, Unknown=0, NotChecked=0, Total=29412 [2021-11-23 17:31:59,637 INFO L933 BasicCegarLoop]: 199 mSDtfsCounter, 1684 mSDsluCounter, 7567 mSDsCounter, 0 mSdLazyCounter, 1198 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1684 SdHoareTripleChecker+Valid, 7766 SdHoareTripleChecker+Invalid, 2777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1529 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:31:59,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1684 Valid, 7766 Invalid, 2777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1198 Invalid, 0 Unknown, 1529 Unchecked, 1.4s Time] [2021-11-23 17:31:59,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18715 states. [2021-11-23 17:32:02,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18715 to 14684. [2021-11-23 17:32:02,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14684 states, 14683 states have (on average 1.2162364639378873) internal successors, (17858), 14683 states have internal predecessors, (17858), 0 states have call successors, (0), 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 17:32:02,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14684 states to 14684 states and 17858 transitions. [2021-11-23 17:32:02,586 INFO L78 Accepts]: Start accepts. Automaton has 14684 states and 17858 transitions. Word has length 109 [2021-11-23 17:32:02,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:32:02,586 INFO L470 AbstractCegarLoop]: Abstraction has 14684 states and 17858 transitions. [2021-11-23 17:32:02,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 5.056603773584905) internal successors, (536), 106 states have internal predecessors, (536), 0 states have call successors, (0), 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 17:32:02,587 INFO L276 IsEmpty]: Start isEmpty. Operand 14684 states and 17858 transitions. [2021-11-23 17:32:02,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:32:02,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:32:02,588 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:32:02,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (121)] Forceful destruction successful, exit code 0 [2021-11-23 17:32:02,812 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2021-11-23 17:32:02,998 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Ended with exit code 0 [2021-11-23 17:32:03,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:32:03,191 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:32:03,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:32:03,191 INFO L85 PathProgramCache]: Analyzing trace with hash 590659791, now seen corresponding path program 1 times [2021-11-23 17:32:03,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:32:03,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1660494708] [2021-11-23 17:32:03,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:03,192 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:32:03,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:32:03,193 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:32:03,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Waiting until timeout for monitored process [2021-11-23 17:32:03,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:03,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:32:03,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:08,283 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 32 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:08,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:11,425 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 22 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:11,425 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:32:11,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1660494708] [2021-11-23 17:32:11,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1660494708] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:11,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [710592324] [2021-11-23 17:32:11,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:11,425 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:32:11,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:32:11,426 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:32:11,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Waiting until timeout for monitored process [2021-11-23 17:32:11,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:11,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-23 17:32:11,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:21,948 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 33 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:21,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:25,283 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 22 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:25,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [710592324] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:25,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773269910] [2021-11-23 17:32:25,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:32:25,284 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:32:25,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:32:25,285 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:32:25,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-23 17:32:25,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:32:25,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:32:25,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:32:33,324 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 32 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:33,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:32:38,209 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 18 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:32:38,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773269910] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:32:38,209 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:32:38,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 33, 27, 27, 26] total 141 [2021-11-23 17:32:38,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366724373] [2021-11-23 17:32:38,210 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:32:38,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2021-11-23 17:32:38,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:32:38,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2021-11-23 17:32:38,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2484, Invalid=17256, Unknown=0, NotChecked=0, Total=19740 [2021-11-23 17:32:38,213 INFO L87 Difference]: Start difference. First operand 14684 states and 17858 transitions. Second operand has 141 states, 141 states have (on average 3.5460992907801416) internal successors, (500), 141 states have internal predecessors, (500), 0 states have call successors, (0), 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 17:33:03,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:03,089 INFO L93 Difference]: Finished difference Result 32578 states and 39612 transitions. [2021-11-23 17:33:03,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2021-11-23 17:33:03,090 INFO L78 Accepts]: Start accepts. Automaton has has 141 states, 141 states have (on average 3.5460992907801416) internal successors, (500), 141 states have internal predecessors, (500), 0 states have call successors, (0), 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 109 [2021-11-23 17:33:03,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:03,115 INFO L225 Difference]: With dead ends: 32578 [2021-11-23 17:33:03,115 INFO L226 Difference]: Without dead ends: 21577 [2021-11-23 17:33:03,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 519 SyntacticMatches, 2 SemanticMatches, 209 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17151 ImplicationChecksByTransitivity, 33.2s TimeCoverageRelationStatistics Valid=4007, Invalid=40303, Unknown=0, NotChecked=0, Total=44310 [2021-11-23 17:33:03,126 INFO L933 BasicCegarLoop]: 252 mSDtfsCounter, 1426 mSDsluCounter, 11587 mSDsCounter, 0 mSdLazyCounter, 4391 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1426 SdHoareTripleChecker+Valid, 11839 SdHoareTripleChecker+Invalid, 5484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 4391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 972 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:03,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1426 Valid, 11839 Invalid, 5484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 4391 Invalid, 0 Unknown, 972 Unchecked, 5.6s Time] [2021-11-23 17:33:03,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21577 states. [2021-11-23 17:33:07,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21577 to 17462. [2021-11-23 17:33:07,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17462 states, 17461 states have (on average 1.2199759463948228) internal successors, (21302), 17461 states have internal predecessors, (21302), 0 states have call successors, (0), 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 17:33:07,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17462 states to 17462 states and 21302 transitions. [2021-11-23 17:33:07,126 INFO L78 Accepts]: Start accepts. Automaton has 17462 states and 21302 transitions. Word has length 109 [2021-11-23 17:33:07,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:07,127 INFO L470 AbstractCegarLoop]: Abstraction has 17462 states and 21302 transitions. [2021-11-23 17:33:07,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 141 states, 141 states have (on average 3.5460992907801416) internal successors, (500), 141 states have internal predecessors, (500), 0 states have call successors, (0), 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 17:33:07,127 INFO L276 IsEmpty]: Start isEmpty. Operand 17462 states and 21302 transitions. [2021-11-23 17:33:07,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:33:07,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:07,128 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:33:07,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:07,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Forceful destruction successful, exit code 0 [2021-11-23 17:33:07,549 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2021-11-23 17:33:07,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:07,729 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:07,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:07,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1417777348, now seen corresponding path program 1 times [2021-11-23 17:33:07,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:07,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [737913480] [2021-11-23 17:33:07,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:07,730 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:07,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:07,731 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:07,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Waiting until timeout for monitored process [2021-11-23 17:33:07,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:07,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 17:33:07,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:11,204 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 32 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:11,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:13,296 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 39 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:13,296 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:13,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [737913480] [2021-11-23 17:33:13,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [737913480] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:13,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1307463318] [2021-11-23 17:33:13,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:13,297 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:13,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:13,298 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:13,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Waiting until timeout for monitored process [2021-11-23 17:33:13,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:13,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:33:13,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:20,071 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 32 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:20,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:22,197 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 39 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:22,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1307463318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:22,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621474960] [2021-11-23 17:33:22,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:22,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:33:22,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:33:22,199 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:33:22,205 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-23 17:33:22,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:22,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:33:22,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:26,335 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 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 17:33:28,404 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:28,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621474960] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:28,404 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:33:28,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 31, 24, 18, 17] total 108 [2021-11-23 17:33:28,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395964327] [2021-11-23 17:33:28,405 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:33:28,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2021-11-23 17:33:28,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:33:28,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2021-11-23 17:33:28,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1221, Invalid=10335, Unknown=0, NotChecked=0, Total=11556 [2021-11-23 17:33:28,408 INFO L87 Difference]: Start difference. First operand 17462 states and 21302 transitions. Second operand has 108 states, 108 states have (on average 4.527777777777778) internal successors, (489), 108 states have internal predecessors, (489), 0 states have call successors, (0), 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 17:33:45,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:33:45,533 INFO L93 Difference]: Finished difference Result 31813 states and 38673 transitions. [2021-11-23 17:33:45,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-23 17:33:45,534 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 108 states have (on average 4.527777777777778) internal successors, (489), 108 states have internal predecessors, (489), 0 states have call successors, (0), 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 109 [2021-11-23 17:33:45,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:33:45,559 INFO L225 Difference]: With dead ends: 31813 [2021-11-23 17:33:45,559 INFO L226 Difference]: Without dead ends: 21783 [2021-11-23 17:33:45,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 767 GetRequests, 585 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13186 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=2881, Invalid=30061, Unknown=0, NotChecked=0, Total=32942 [2021-11-23 17:33:45,570 INFO L933 BasicCegarLoop]: 186 mSDtfsCounter, 1046 mSDsluCounter, 6117 mSDsCounter, 0 mSdLazyCounter, 1547 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1046 SdHoareTripleChecker+Valid, 6303 SdHoareTripleChecker+Invalid, 2877 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1283 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 17:33:45,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1046 Valid, 6303 Invalid, 2877 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1547 Invalid, 0 Unknown, 1283 Unchecked, 1.9s Time] [2021-11-23 17:33:45,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21783 states. [2021-11-23 17:33:49,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21783 to 17576. [2021-11-23 17:33:49,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17576 states, 17575 states have (on average 1.2200284495021336) internal successors, (21442), 17575 states have internal predecessors, (21442), 0 states have call successors, (0), 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 17:33:50,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17576 states to 17576 states and 21442 transitions. [2021-11-23 17:33:50,001 INFO L78 Accepts]: Start accepts. Automaton has 17576 states and 21442 transitions. Word has length 109 [2021-11-23 17:33:50,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:33:50,001 INFO L470 AbstractCegarLoop]: Abstraction has 17576 states and 21442 transitions. [2021-11-23 17:33:50,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 108 states have (on average 4.527777777777778) internal successors, (489), 108 states have internal predecessors, (489), 0 states have call successors, (0), 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 17:33:50,001 INFO L276 IsEmpty]: Start isEmpty. Operand 17576 states and 21442 transitions. [2021-11-23 17:33:50,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:33:50,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:33:50,003 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:33:50,026 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Ended with exit code 0 [2021-11-23 17:33:50,205 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Ended with exit code 0 [2021-11-23 17:33:50,411 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Ended with exit code 0 [2021-11-23 17:33:50,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:33:50,604 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:33:50,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:33:50,604 INFO L85 PathProgramCache]: Analyzing trace with hash 2134301750, now seen corresponding path program 1 times [2021-11-23 17:33:50,604 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:33:50,604 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1670863141] [2021-11-23 17:33:50,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:50,605 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:33:50,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:33:50,606 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:33:50,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 17:33:50,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:50,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 17:33:50,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:51,029 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 53 proven. 31 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:33:51,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:33:51,334 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 53 proven. 31 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 17:33:51,335 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:33:51,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1670863141] [2021-11-23 17:33:51,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1670863141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:33:51,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [201733391] [2021-11-23 17:33:51,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:33:51,335 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:33:51,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:33:51,336 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:33:51,337 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 17:33:51,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:33:51,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:33:51,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:33:56,825 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:33:56,825 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:00,019 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:00,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [201733391] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:00,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072799668] [2021-11-23 17:34:00,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:00,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:00,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:00,020 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:00,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 17:34:00,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:00,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 17:34:00,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:05,458 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:05,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:07,237 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:07,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072799668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:07,238 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:07,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 28, 26, 27, 25] total 89 [2021-11-23 17:34:07,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781231400] [2021-11-23 17:34:07,238 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:07,239 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2021-11-23 17:34:07,239 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:07,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2021-11-23 17:34:07,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=962, Invalid=6870, Unknown=0, NotChecked=0, Total=7832 [2021-11-23 17:34:07,240 INFO L87 Difference]: Start difference. First operand 17576 states and 21442 transitions. Second operand has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 0 states have call successors, (0), 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 17:34:15,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:34:15,219 INFO L93 Difference]: Finished difference Result 24235 states and 29706 transitions. [2021-11-23 17:34:15,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 17:34:15,219 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 0 states have call successors, (0), 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 109 [2021-11-23 17:34:15,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:34:15,242 INFO L225 Difference]: With dead ends: 24235 [2021-11-23 17:34:15,242 INFO L226 Difference]: Without dead ends: 18470 [2021-11-23 17:34:15,250 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 574 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 4672 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=1482, Invalid=10950, Unknown=0, NotChecked=0, Total=12432 [2021-11-23 17:34:15,250 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 1350 mSDsluCounter, 3706 mSDsCounter, 0 mSdLazyCounter, 1237 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1350 SdHoareTripleChecker+Valid, 3838 SdHoareTripleChecker+Invalid, 1848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 558 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:34:15,250 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1350 Valid, 3838 Invalid, 1848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1237 Invalid, 0 Unknown, 558 Unchecked, 1.3s Time] [2021-11-23 17:34:15,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18470 states. [2021-11-23 17:34:19,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18470 to 17605. [2021-11-23 17:34:19,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17605 states, 17604 states have (on average 1.2201204271756418) internal successors, (21479), 17604 states have internal predecessors, (21479), 0 states have call successors, (0), 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 17:34:19,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17605 states to 17605 states and 21479 transitions. [2021-11-23 17:34:19,291 INFO L78 Accepts]: Start accepts. Automaton has 17605 states and 21479 transitions. Word has length 109 [2021-11-23 17:34:19,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:34:19,291 INFO L470 AbstractCegarLoop]: Abstraction has 17605 states and 21479 transitions. [2021-11-23 17:34:19,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 4.48314606741573) internal successors, (399), 89 states have internal predecessors, (399), 0 states have call successors, (0), 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 17:34:19,291 INFO L276 IsEmpty]: Start isEmpty. Operand 17605 states and 21479 transitions. [2021-11-23 17:34:19,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-23 17:34:19,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:34:19,293 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 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] [2021-11-23 17:34:19,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:19,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2021-11-23 17:34:19,704 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Forceful destruction successful, exit code 0 [2021-11-23 17:34:19,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:34:19,896 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:34:19,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:34:19,897 INFO L85 PathProgramCache]: Analyzing trace with hash 891506012, now seen corresponding path program 1 times [2021-11-23 17:34:19,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:34:19,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1352556177] [2021-11-23 17:34:19,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:19,897 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:34:19,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:34:19,898 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:34:19,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:34:20,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:20,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 17:34:20,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:26,398 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:26,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:29,044 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:29,044 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:34:29,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1352556177] [2021-11-23 17:34:29,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1352556177] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:29,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [887402469] [2021-11-23 17:34:29,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:29,044 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:34:29,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:34:29,045 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:34:29,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2021-11-23 17:34:29,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:29,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:34:29,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:38,926 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 22 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:38,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:43,913 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:43,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [887402469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:43,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123076072] [2021-11-23 17:34:43,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 17:34:43,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:34:43,914 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:34:43,915 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:34:43,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dffbb826-d75d-41bf-a64f-3bca6348d5ee/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-23 17:34:44,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:34:44,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 17:34:44,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:34:47,804 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:47,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:34:49,492 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 13 proven. 75 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 17:34:49,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123076072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:34:49,492 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:34:49,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 31, 28, 18, 17] total 114 [2021-11-23 17:34:49,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901829694] [2021-11-23 17:34:49,492 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:34:49,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2021-11-23 17:34:49,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:34:49,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-11-23 17:34:49,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1209, Invalid=11673, Unknown=0, NotChecked=0, Total=12882 [2021-11-23 17:34:49,494 INFO L87 Difference]: Start difference. First operand 17605 states and 21479 transitions. Second operand has 114 states, 114 states have (on average 4.456140350877193) internal successors, (508), 114 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)