./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de32.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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de32.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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 be02771c62bfe2ce14e3e1aa527948281d29318788bbe261fd0d537b1dc5e291 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:51:55,764 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:51:55,767 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:51:55,828 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:51:55,829 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:51:55,836 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:51:55,839 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:51:55,843 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:51:55,846 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:51:55,847 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:51:55,849 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:51:55,850 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:51:55,851 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:51:55,852 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:51:55,854 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:51:55,856 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:51:55,864 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:51:55,866 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:51:55,869 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:51:55,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:51:55,879 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:51:55,881 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:51:55,885 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:51:55,886 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:51:55,892 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:51:55,893 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:51:55,893 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:51:55,896 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:51:55,896 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:51:55,898 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:51:55,899 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:51:55,900 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:51:55,902 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:51:55,904 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:51:55,906 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:51:55,906 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:51:55,907 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:51:55,907 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:51:55,908 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:51:55,909 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:51:55,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:51:55,911 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 16:51:55,966 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:51:55,967 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:51:55,968 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:51:55,968 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:51:55,970 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:51:55,970 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:51:55,970 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:51:55,971 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:51:55,971 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:51:55,971 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 16:51:55,973 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:51:55,973 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:51:55,973 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 16:51:55,974 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 16:51:55,974 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:51:55,974 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 16:51:55,975 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 16:51:55,975 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 16:51:55,976 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:51:55,976 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:51:55,977 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 16:51:55,977 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:51:55,977 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:51:55,978 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:51:55,978 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:51:55,978 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:51:55,978 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:51:55,979 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:51:55,979 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:51:55,979 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:51:55,980 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:51:55,980 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:51:55,981 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:51:55,981 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:51:55,981 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:51:55,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:51:55,982 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 16:51:55,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 16:51:55,983 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:51:55,983 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:51:55,983 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:51:55,984 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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be02771c62bfe2ce14e3e1aa527948281d29318788bbe261fd0d537b1dc5e291 [2021-11-23 16:51:56,304 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:51:56,349 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:51:56,351 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:51:56,352 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:51:56,353 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:51:56,354 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loops-crafted-1/in-de32.c [2021-11-23 16:51:56,450 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/a5fa9efa0/e42f93a8555f4731881247dcb96e37a3/FLAG19ed6858d [2021-11-23 16:51:56,942 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:51:56,943 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/sv-benchmarks/c/loops-crafted-1/in-de32.c [2021-11-23 16:51:56,949 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/a5fa9efa0/e42f93a8555f4731881247dcb96e37a3/FLAG19ed6858d [2021-11-23 16:51:57,311 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/a5fa9efa0/e42f93a8555f4731881247dcb96e37a3 [2021-11-23 16:51:57,314 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:51:57,316 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:51:57,318 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:51:57,327 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:51:57,340 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:51:57,341 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,350 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a9804fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57, skipping insertion in model container [2021-11-23 16:51:57,351 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,363 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:51:57,377 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:51:57,577 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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/sv-benchmarks/c/loops-crafted-1/in-de32.c[368,381] [2021-11-23 16:51:57,593 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:51:57,602 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:51:57,615 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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/sv-benchmarks/c/loops-crafted-1/in-de32.c[368,381] [2021-11-23 16:51:57,619 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:51:57,634 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:51:57,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57 WrapperNode [2021-11-23 16:51:57,634 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:51:57,636 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:51:57,636 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:51:57,636 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:51:57,645 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,652 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,672 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 55 [2021-11-23 16:51:57,673 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:51:57,673 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:51:57,674 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:51:57,674 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:51:57,683 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,683 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,684 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,685 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,688 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,692 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,693 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,695 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:51:57,696 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:51:57,696 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:51:57,696 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:51:57,698 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:51:57" (1/1) ... [2021-11-23 16:51:57,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:51:57,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:51:57,737 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:51:57,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:51:57,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:51:57,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:51:57,789 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:51:57,789 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 16:51:57,864 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:51:57,866 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:51:58,021 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:51:58,036 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 16:51:58,041 INFO L158 Benchmark]: Toolchain (without parser) took 723.50ms. Allocated memory was 81.8MB in the beginning and 104.9MB in the end (delta: 23.1MB). Free memory was 43.4MB in the beginning and 69.3MB in the end (delta: -25.9MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:51:58,043 INFO L158 Benchmark]: CDTParser took 0.20ms. Allocated memory is still 81.8MB. Free memory was 59.9MB in the beginning and 59.8MB in the end (delta: 46.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 16:51:58,044 INFO L158 Benchmark]: CACSL2BoogieTranslator took 316.41ms. Allocated memory was 81.8MB in the beginning and 104.9MB in the end (delta: 23.1MB). Free memory was 43.1MB in the beginning and 81.4MB in the end (delta: -38.3MB). Peak memory consumption was 5.7MB. Max. memory is 16.1GB. [2021-11-23 16:51:58,046 INFO L158 Benchmark]: Boogie Procedure Inliner took 37.01ms. Allocated memory is still 104.9MB. Free memory was 81.2MB in the beginning and 79.9MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 16:51:58,047 INFO L158 Benchmark]: Boogie Preprocessor took 21.79ms. Allocated memory is still 104.9MB. Free memory was 79.7MB in the beginning and 78.8MB in the end (delta: 886.7kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-23 16:51:58,048 INFO L158 Benchmark]: RCFGBuilder took 342.65ms. Allocated memory is still 104.9MB. Free memory was 78.8MB in the beginning and 69.3MB in the end (delta: 9.5MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2021-11-23 16:51:58,054 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20ms. Allocated memory is still 81.8MB. Free memory was 59.9MB in the beginning and 59.8MB in the end (delta: 46.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 316.41ms. Allocated memory was 81.8MB in the beginning and 104.9MB in the end (delta: 23.1MB). Free memory was 43.1MB in the beginning and 81.4MB in the end (delta: -38.3MB). Peak memory consumption was 5.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 37.01ms. Allocated memory is still 104.9MB. Free memory was 81.2MB in the beginning and 79.9MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 21.79ms. Allocated memory is still 104.9MB. Free memory was 79.7MB in the beginning and 78.8MB in the end (delta: 886.7kB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 342.65ms. Allocated memory is still 104.9MB. Free memory was 78.8MB in the beginning and 69.3MB in the end (delta: 9.5MB). Peak memory consumption was 8.4MB. 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 16:51:58,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de32.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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 be02771c62bfe2ce14e3e1aa527948281d29318788bbe261fd0d537b1dc5e291 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-6a47aea [2021-11-23 16:52:00,713 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 16:52:00,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 16:52:00,753 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 16:52:00,754 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 16:52:00,756 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 16:52:00,757 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 16:52:00,760 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 16:52:00,763 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 16:52:00,764 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 16:52:00,765 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 16:52:00,767 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 16:52:00,768 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 16:52:00,769 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 16:52:00,771 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 16:52:00,773 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 16:52:00,774 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 16:52:00,775 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 16:52:00,777 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 16:52:00,780 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 16:52:00,782 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 16:52:00,792 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 16:52:00,793 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 16:52:00,794 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 16:52:00,798 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 16:52:00,799 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 16:52:00,799 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 16:52:00,800 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 16:52:00,801 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 16:52:00,802 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 16:52:00,803 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 16:52:00,803 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 16:52:00,804 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 16:52:00,805 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 16:52:00,807 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 16:52:00,807 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 16:52:00,808 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 16:52:00,808 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 16:52:00,809 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 16:52:00,810 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 16:52:00,811 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 16:52:00,812 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 16:52:00,841 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 16:52:00,841 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 16:52:00,842 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 16:52:00,842 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 16:52:00,843 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 16:52:00,843 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 16:52:00,843 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 16:52:00,844 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 16:52:00,844 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 16:52:00,844 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 16:52:00,844 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 16:52:00,844 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 16:52:00,845 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 16:52:00,846 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 16:52:00,846 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 16:52:00,846 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 16:52:00,846 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 16:52:00,847 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 16:52:00,847 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 16:52:00,847 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 16:52:00,847 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 16:52:00,847 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 16:52:00,848 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 16:52:00,848 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 16:52:00,848 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 16:52:00,848 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 16:52:00,849 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 16:52:00,849 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 16:52:00,849 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 16:52:00,849 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:52:00,850 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 16:52:00,850 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 16:52:00,850 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 16:52:00,850 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 16:52:00,850 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:00,851 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 16:52:00,851 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 16:52:00,851 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 16:52:00,851 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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be02771c62bfe2ce14e3e1aa527948281d29318788bbe261fd0d537b1dc5e291 [2021-11-23 16:52:01,311 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 16:52:01,340 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 16:52:01,344 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 16:52:01,345 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 16:52:01,346 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 16:52:01,348 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/../../sv-benchmarks/c/loops-crafted-1/in-de32.c [2021-11-23 16:52:01,437 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/9b7979961/d70dfff463bd4361955e06e446bfe908/FLAG2b2449338 [2021-11-23 16:52:01,968 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 16:52:01,969 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/sv-benchmarks/c/loops-crafted-1/in-de32.c [2021-11-23 16:52:01,976 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/9b7979961/d70dfff463bd4361955e06e446bfe908/FLAG2b2449338 [2021-11-23 16:52:02,340 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/data/9b7979961/d70dfff463bd4361955e06e446bfe908 [2021-11-23 16:52:02,343 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 16:52:02,348 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 16:52:02,353 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 16:52:02,353 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 16:52:02,357 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 16:52:02,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,360 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39a29b89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02, skipping insertion in model container [2021-11-23 16:52:02,360 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,368 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 16:52:02,385 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 16:52:02,520 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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/sv-benchmarks/c/loops-crafted-1/in-de32.c[368,381] [2021-11-23 16:52:02,543 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:52:02,556 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 16:52:02,574 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_b8f92265-2ef4-42c5-9528-0c69edfa1fae/sv-benchmarks/c/loops-crafted-1/in-de32.c[368,381] [2021-11-23 16:52:02,582 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 16:52:02,610 INFO L208 MainTranslator]: Completed translation [2021-11-23 16:52:02,610 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02 WrapperNode [2021-11-23 16:52:02,611 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 16:52:02,614 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 16:52:02,614 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 16:52:02,614 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 16:52:02,622 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,632 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,681 INFO L137 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 55 [2021-11-23 16:52:02,686 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 16:52:02,687 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 16:52:02,687 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 16:52:02,688 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 16:52:02,697 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,697 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,715 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,716 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,721 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,725 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,727 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,729 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 16:52:02,730 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 16:52:02,730 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 16:52:02,730 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 16:52:02,735 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (1/1) ... [2021-11-23 16:52:02,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 16:52:02,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:02,773 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 16:52:02,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 16:52:02,835 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 16:52:02,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 16:52:02,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 16:52:02,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 16:52:02,914 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 16:52:02,916 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 16:52:03,120 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 16:52:03,126 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 16:52:03,128 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-23 16:52:03,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:52:03 BoogieIcfgContainer [2021-11-23 16:52:03,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 16:52:03,135 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 16:52:03,135 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 16:52:03,138 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 16:52:03,139 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:52:02" (1/3) ... [2021-11-23 16:52:03,140 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5aa56dcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:52:03, skipping insertion in model container [2021-11-23 16:52:03,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:52:02" (2/3) ... [2021-11-23 16:52:03,141 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5aa56dcb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:52:03, skipping insertion in model container [2021-11-23 16:52:03,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:52:03" (3/3) ... [2021-11-23 16:52:03,146 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de32.c [2021-11-23 16:52:03,153 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 16:52:03,153 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 16:52:03,223 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 16:52:03,236 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 16:52:03,237 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 16:52:03,273 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 16:52:03,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:03,291 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:03,292 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:03,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:03,300 INFO L85 PathProgramCache]: Analyzing trace with hash -1157484939, now seen corresponding path program 1 times [2021-11-23 16:52:03,326 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:03,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1402685031] [2021-11-23 16:52:03,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:03,330 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:03,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:03,347 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:03,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 16:52:03,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:03,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:03,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:03,698 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 16:52:03,698 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:03,699 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:03,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1402685031] [2021-11-23 16:52:03,700 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1402685031] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:03,700 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:03,700 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:03,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692956923] [2021-11-23 16:52:03,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:03,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:03,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:03,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:03,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:03,746 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 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 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:03,806 INFO L93 Difference]: Finished difference Result 33 states and 47 transitions. [2021-11-23 16:52:03,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:03,809 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 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 9 [2021-11-23 16:52:03,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:03,818 INFO L225 Difference]: With dead ends: 33 [2021-11-23 16:52:03,819 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 16:52:03,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 16:52:03,826 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 9 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:03,828 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 32 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:03,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 16:52:03,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 16:52:03,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2021-11-23 16:52:03,862 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 9 [2021-11-23 16:52:03,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:03,862 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2021-11-23 16:52:03,862 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:03,863 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2021-11-23 16:52:03,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 16:52:03,863 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:03,863 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:03,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:04,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:04,071 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:04,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:04,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1520629346, now seen corresponding path program 1 times [2021-11-23 16:52:04,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:04,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [300962347] [2021-11-23 16:52:04,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:04,077 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:04,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:04,078 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:04,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 16:52:04,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:04,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 16:52:04,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:04,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:04,166 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:04,166 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:04,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [300962347] [2021-11-23 16:52:04,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [300962347] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:04,167 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:04,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 16:52:04,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379533154] [2021-11-23 16:52:04,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:04,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 16:52:04,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:04,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 16:52:04,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 16:52:04,171 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:04,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:04,186 INFO L93 Difference]: Finished difference Result 23 states and 30 transitions. [2021-11-23 16:52:04,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 16:52:04,187 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2021-11-23 16:52:04,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:04,188 INFO L225 Difference]: With dead ends: 23 [2021-11-23 16:52:04,188 INFO L226 Difference]: Without dead ends: 17 [2021-11-23 16:52:04,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 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 16:52:04,191 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 5 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:04,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 13 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:04,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-23 16:52:04,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-23 16:52:04,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:04,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2021-11-23 16:52:04,198 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 10 [2021-11-23 16:52:04,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:04,198 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2021-11-23 16:52:04,198 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:04,199 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2021-11-23 16:52:04,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 16:52:04,199 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:04,200 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:04,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:04,410 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:04,411 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:04,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:04,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1475376817, now seen corresponding path program 1 times [2021-11-23 16:52:04,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:04,412 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [483334936] [2021-11-23 16:52:04,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:04,413 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:04,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:04,414 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:04,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 16:52:04,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:04,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:52:04,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:04,549 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 16:52:04,557 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:04,557 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:04,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [483334936] [2021-11-23 16:52:04,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [483334936] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:04,558 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 16:52:04,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 16:52:04,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368874398] [2021-11-23 16:52:04,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:04,560 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:04,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:04,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:04,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 16:52:04,561 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:04,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:04,601 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2021-11-23 16:52:04,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:04,602 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2021-11-23 16:52:04,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:04,605 INFO L225 Difference]: With dead ends: 21 [2021-11-23 16:52:04,605 INFO L226 Difference]: Without dead ends: 13 [2021-11-23 16:52:04,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 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 16:52:04,607 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 16 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 16:52:04,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 16 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:04,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-23 16:52:04,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-23 16:52:04,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:04,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2021-11-23 16:52:04,620 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 10 [2021-11-23 16:52:04,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:04,621 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2021-11-23 16:52:04,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:04,621 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2021-11-23 16:52:04,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 16:52:04,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:04,622 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:04,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:04,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:04,837 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:04,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:04,838 INFO L85 PathProgramCache]: Analyzing trace with hash 925156739, now seen corresponding path program 1 times [2021-11-23 16:52:04,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:04,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1207374068] [2021-11-23 16:52:04,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:04,839 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:04,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:04,841 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:04,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 16:52:04,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:04,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 16:52:04,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:04,964 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:04,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:05,045 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:05,045 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:05,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1207374068] [2021-11-23 16:52:05,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1207374068] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:05,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [57926195] [2021-11-23 16:52:05,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:05,047 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:05,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:05,065 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:05,087 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-23 16:52:05,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:05,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:52:05,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:05,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:05,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 16:52:05,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [57926195] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 16:52:05,189 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 16:52:05,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5] total 9 [2021-11-23 16:52:05,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671344766] [2021-11-23 16:52:05,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:05,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:05,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:05,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:05,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:52:05,200 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:05,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:05,243 INFO L93 Difference]: Finished difference Result 18 states and 21 transitions. [2021-11-23 16:52:05,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:05,245 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-11-23 16:52:05,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:05,247 INFO L225 Difference]: With dead ends: 18 [2021-11-23 16:52:05,247 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 16:52:05,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:52:05,251 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:05,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 17 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:05,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 16:52:05,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 16:52:05,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:05,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-11-23 16:52:05,261 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 11 [2021-11-23 16:52:05,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:05,261 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-11-23 16:52:05,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:05,262 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-11-23 16:52:05,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 16:52:05,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:05,262 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:05,268 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2021-11-23 16:52:05,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:05,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:05,663 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:05,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:05,664 INFO L85 PathProgramCache]: Analyzing trace with hash 970409268, now seen corresponding path program 1 times [2021-11-23 16:52:05,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:05,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1486894042] [2021-11-23 16:52:05,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:05,665 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:05,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:05,676 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:05,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 16:52:05,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:05,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:52:05,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:05,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:05,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:05,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:05,780 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:05,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1486894042] [2021-11-23 16:52:05,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1486894042] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:05,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1573288640] [2021-11-23 16:52:05,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:05,781 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:05,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:05,782 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:05,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 16:52:05,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:05,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 16:52:05,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:05,885 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:05,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:05,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:05,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1573288640] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 16:52:05,934 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 16:52:05,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4, 4] total 8 [2021-11-23 16:52:05,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704643824] [2021-11-23 16:52:05,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 16:52:05,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 16:52:05,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:05,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 16:52:05,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:52:05,940 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:05,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:05,970 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2021-11-23 16:52:05,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 16:52:05,978 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-11-23 16:52:05,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:05,980 INFO L225 Difference]: With dead ends: 17 [2021-11-23 16:52:05,980 INFO L226 Difference]: Without dead ends: 13 [2021-11-23 16:52:05,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:52:05,984 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 1 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:05,989 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 21 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:05,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-23 16:52:06,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-23 16:52:06,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:06,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-23 16:52:06,001 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 11 [2021-11-23 16:52:06,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:06,002 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-23 16:52:06,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:06,002 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-23 16:52:06,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 16:52:06,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:06,004 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:06,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:06,218 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2021-11-23 16:52:06,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:06,418 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:06,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:06,419 INFO L85 PathProgramCache]: Analyzing trace with hash 19581631, now seen corresponding path program 1 times [2021-11-23 16:52:06,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:06,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1739725557] [2021-11-23 16:52:06,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:06,420 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:06,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:06,422 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:06,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 16:52:06,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:06,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:06,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:06,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:06,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:06,636 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:06,636 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:06,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1739725557] [2021-11-23 16:52:06,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1739725557] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:06,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1402571339] [2021-11-23 16:52:06,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:06,637 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:06,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:06,638 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:06,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 16:52:06,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:06,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:06,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:06,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:06,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:06,824 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:06,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1402571339] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:06,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329281563] [2021-11-23 16:52:06,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 16:52:06,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:06,826 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:06,827 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:06,851 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 16:52:06,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:06,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:52:06,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:06,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:06,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:06,978 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:06,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329281563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:06,978 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:06,979 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 6 [2021-11-23 16:52:06,979 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711350477] [2021-11-23 16:52:06,979 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:06,980 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 16:52:06,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:06,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 16:52:06,981 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 16:52:06,982 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:07,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:07,042 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-23 16:52:07,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 16:52:07,043 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 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 12 [2021-11-23 16:52:07,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:07,045 INFO L225 Difference]: With dead ends: 20 [2021-11-23 16:52:07,045 INFO L226 Difference]: Without dead ends: 16 [2021-11-23 16:52:07,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:52:07,052 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 1 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:07,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 36 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:07,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-23 16:52:07,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-23 16:52:07,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:07,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2021-11-23 16:52:07,077 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 12 [2021-11-23 16:52:07,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:07,077 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2021-11-23 16:52:07,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:07,078 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2021-11-23 16:52:07,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 16:52:07,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:07,079 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:07,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:07,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:07,506 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:07,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:07,700 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:07,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:07,700 INFO L85 PathProgramCache]: Analyzing trace with hash 608695956, now seen corresponding path program 2 times [2021-11-23 16:52:07,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:07,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1154761618] [2021-11-23 16:52:07,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:07,701 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:07,701 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:07,702 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:07,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-23 16:52:07,736 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:07,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:07,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:07,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:07,794 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:07,795 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:07,854 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:07,854 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:07,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1154761618] [2021-11-23 16:52:07,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1154761618] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:07,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1163259392] [2021-11-23 16:52:07,855 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:07,855 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:07,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:07,860 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:07,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-23 16:52:07,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:07,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:07,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:07,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:07,971 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:07,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:08,011 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:08,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1163259392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:08,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279137008] [2021-11-23 16:52:08,012 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:08,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:08,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:08,014 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:08,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 16:52:08,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:08,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:08,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 16:52:08,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:08,102 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:08,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:08,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:08,140 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279137008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:08,140 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:08,140 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5, 5] total 8 [2021-11-23 16:52:08,141 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414136218] [2021-11-23 16:52:08,141 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:08,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:52:08,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:08,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:52:08,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:52:08,143 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:08,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:08,246 INFO L93 Difference]: Finished difference Result 55 states and 74 transitions. [2021-11-23 16:52:08,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 16:52:08,247 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 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 13 [2021-11-23 16:52:08,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:08,249 INFO L225 Difference]: With dead ends: 55 [2021-11-23 16:52:08,251 INFO L226 Difference]: Without dead ends: 48 [2021-11-23 16:52:08,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:52:08,253 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:08,254 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 58 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:08,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-23 16:52:08,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 38. [2021-11-23 16:52:08,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.3783783783783783) internal successors, (51), 37 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:08,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 51 transitions. [2021-11-23 16:52:08,268 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 51 transitions. Word has length 13 [2021-11-23 16:52:08,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:08,268 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 51 transitions. [2021-11-23 16:52:08,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:08,268 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 51 transitions. [2021-11-23 16:52:08,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 16:52:08,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:08,271 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:08,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:08,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:08,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (13)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:08,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:08,891 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:08,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:08,892 INFO L85 PathProgramCache]: Analyzing trace with hash 2011524355, now seen corresponding path program 3 times [2021-11-23 16:52:08,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:08,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [949330713] [2021-11-23 16:52:08,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:08,892 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:08,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:08,893 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:08,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 16:52:08,925 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:52:08,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:08,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:08,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:09,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:09,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:09,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:09,102 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:09,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [949330713] [2021-11-23 16:52:09,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [949330713] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:09,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1016324878] [2021-11-23 16:52:09,105 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:09,106 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:09,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:09,107 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:09,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 16:52:09,198 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:52:09,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:09,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:09,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:09,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:09,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:09,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:09,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1016324878] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:09,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830617679] [2021-11-23 16:52:09,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:09,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:09,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:09,268 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:09,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 16:52:09,313 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 16:52:09,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:09,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:09,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:09,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:09,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:09,391 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:09,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830617679] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:09,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:09,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 12 [2021-11-23 16:52:09,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012011590] [2021-11-23 16:52:09,392 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:09,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 16:52:09,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:09,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 16:52:09,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:52:09,394 INFO L87 Difference]: Start difference. First operand 38 states and 51 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:09,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:09,664 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2021-11-23 16:52:09,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:52:09,664 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 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 13 [2021-11-23 16:52:09,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:09,665 INFO L225 Difference]: With dead ends: 51 [2021-11-23 16:52:09,665 INFO L226 Difference]: Without dead ends: 37 [2021-11-23 16:52:09,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2021-11-23 16:52:09,667 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:09,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 52 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:09,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-23 16:52:09,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-11-23 16:52:09,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.3823529411764706) internal successors, (47), 34 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:09,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 47 transitions. [2021-11-23 16:52:09,676 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 47 transitions. Word has length 13 [2021-11-23 16:52:09,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:09,676 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 47 transitions. [2021-11-23 16:52:09,676 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:09,677 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 47 transitions. [2021-11-23 16:52:09,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 16:52:09,678 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:09,678 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:09,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:09,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:10,092 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:10,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:10,292 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:10,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:10,292 INFO L85 PathProgramCache]: Analyzing trace with hash 854515253, now seen corresponding path program 4 times [2021-11-23 16:52:10,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:10,292 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2074251301] [2021-11-23 16:52:10,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:10,293 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:10,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:10,294 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:10,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-23 16:52:10,335 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:10,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:10,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:10,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:10,442 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:10,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:10,493 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:10,494 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:10,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2074251301] [2021-11-23 16:52:10,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2074251301] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:10,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1052994106] [2021-11-23 16:52:10,495 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:10,495 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:10,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:10,500 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:10,523 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-23 16:52:10,601 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:10,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:10,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:10,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:10,678 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:10,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:10,723 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:10,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1052994106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:10,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230016809] [2021-11-23 16:52:10,724 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:10,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:10,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:10,725 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:10,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 16:52:10,773 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:10,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:10,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 16:52:10,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:10,849 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:10,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:10,900 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:10,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230016809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:10,901 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:10,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6, 6] total 7 [2021-11-23 16:52:10,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107491581] [2021-11-23 16:52:10,904 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:10,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 16:52:10,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:10,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 16:52:10,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 16:52:10,907 INFO L87 Difference]: Start difference. First operand 35 states and 47 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:10,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:10,979 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2021-11-23 16:52:10,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 16:52:10,980 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 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 15 [2021-11-23 16:52:10,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:10,985 INFO L225 Difference]: With dead ends: 57 [2021-11-23 16:52:10,986 INFO L226 Difference]: Without dead ends: 53 [2021-11-23 16:52:10,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:52:10,987 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 6 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:10,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 48 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 16:52:10,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-23 16:52:10,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 37. [2021-11-23 16:52:10,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.4166666666666667) internal successors, (51), 36 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:10,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2021-11-23 16:52:10,999 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 15 [2021-11-23 16:52:10,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:10,999 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2021-11-23 16:52:10,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:11,000 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2021-11-23 16:52:11,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 16:52:11,001 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:11,001 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:11,019 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:11,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:11,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2021-11-23 16:52:11,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:11,620 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:11,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:11,620 INFO L85 PathProgramCache]: Analyzing trace with hash 721834462, now seen corresponding path program 5 times [2021-11-23 16:52:11,620 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:11,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [314483336] [2021-11-23 16:52:11,620 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:11,621 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:11,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:11,623 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:11,624 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 16:52:11,666 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-11-23 16:52:11,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:11,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:11,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:11,737 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:11,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:11,795 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:11,796 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:11,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [314483336] [2021-11-23 16:52:11,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [314483336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:11,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [263795031] [2021-11-23 16:52:11,797 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:11,797 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:11,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:11,800 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:11,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 16:52:11,907 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-11-23 16:52:11,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:11,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 16:52:11,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:11,949 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:11,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:11,993 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:11,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [263795031] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:11,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541458361] [2021-11-23 16:52:11,994 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:11,994 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:11,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:11,995 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:12,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 16:52:12,039 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-11-23 16:52:12,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:12,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 16:52:12,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:12,088 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:12,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:12,168 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:12,169 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541458361] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:12,169 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:12,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 10 [2021-11-23 16:52:12,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083388830] [2021-11-23 16:52:12,170 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:12,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 16:52:12,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:12,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 16:52:12,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:52:12,172 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:12,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:12,306 INFO L93 Difference]: Finished difference Result 83 states and 114 transitions. [2021-11-23 16:52:12,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 16:52:12,307 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 0 states have call successors, (0), 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 16 [2021-11-23 16:52:12,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:12,308 INFO L225 Difference]: With dead ends: 83 [2021-11-23 16:52:12,308 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 16:52:12,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2021-11-23 16:52:12,310 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:12,310 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 61 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:12,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 16:52:12,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 56. [2021-11-23 16:52:12,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.4) internal successors, (77), 55 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:12,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 77 transitions. [2021-11-23 16:52:12,329 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 77 transitions. Word has length 16 [2021-11-23 16:52:12,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:12,329 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 77 transitions. [2021-11-23 16:52:12,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:12,330 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 77 transitions. [2021-11-23 16:52:12,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 16:52:12,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:12,332 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:12,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:12,540 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:12,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:12,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:12,936 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:12,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:12,936 INFO L85 PathProgramCache]: Analyzing trace with hash 1259841871, now seen corresponding path program 6 times [2021-11-23 16:52:12,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:12,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [591020400] [2021-11-23 16:52:12,937 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:12,937 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:12,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:12,938 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:12,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-23 16:52:12,971 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:52:12,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:12,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:12,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:13,060 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:13,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:13,187 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:13,188 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:13,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [591020400] [2021-11-23 16:52:13,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [591020400] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:13,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1625630855] [2021-11-23 16:52:13,188 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:13,188 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:13,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:13,192 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:13,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-23 16:52:13,297 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:52:13,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:13,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:13,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:13,336 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:13,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:13,398 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:13,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1625630855] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:13,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9855016] [2021-11-23 16:52:13,398 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:13,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:13,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:13,399 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:13,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 16:52:13,433 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-11-23 16:52:13,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:13,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 16:52:13,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:13,473 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:13,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:13,517 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 16:52:13,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9855016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:13,518 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:13,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 16 [2021-11-23 16:52:13,518 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090120814] [2021-11-23 16:52:13,518 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:13,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:52:13,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:13,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:52:13,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:52:13,521 INFO L87 Difference]: Start difference. First operand 56 states and 77 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:14,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:14,021 INFO L93 Difference]: Finished difference Result 77 states and 105 transitions. [2021-11-23 16:52:14,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-23 16:52:14,022 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 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 16 [2021-11-23 16:52:14,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:14,023 INFO L225 Difference]: With dead ends: 77 [2021-11-23 16:52:14,023 INFO L226 Difference]: Without dead ends: 58 [2021-11-23 16:52:14,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=245, Invalid=1161, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 16:52:14,025 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 52 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:14,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 54 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:14,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-23 16:52:14,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2021-11-23 16:52:14,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.4038461538461537) internal successors, (73), 52 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:14,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 73 transitions. [2021-11-23 16:52:14,041 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 73 transitions. Word has length 16 [2021-11-23 16:52:14,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:14,042 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 73 transitions. [2021-11-23 16:52:14,042 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:14,042 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 73 transitions. [2021-11-23 16:52:14,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-23 16:52:14,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:14,048 INFO L514 BasicCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:14,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:14,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:14,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-23 16:52:14,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:14,650 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:14,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:14,650 INFO L85 PathProgramCache]: Analyzing trace with hash 865244099, now seen corresponding path program 7 times [2021-11-23 16:52:14,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:14,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1578057063] [2021-11-23 16:52:14,651 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:14,651 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:14,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:14,652 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:14,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 16:52:14,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:14,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:14,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:14,801 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:14,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:14,980 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:14,980 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:14,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1578057063] [2021-11-23 16:52:14,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1578057063] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:14,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [731198097] [2021-11-23 16:52:14,981 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:14,981 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:14,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:14,983 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:15,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 16:52:15,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:15,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:15,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:15,132 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:15,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:15,185 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:15,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [731198097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:15,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845593587] [2021-11-23 16:52:15,186 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:15,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:15,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:15,192 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:15,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 16:52:15,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:15,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:15,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:15,276 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:15,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:15,328 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 16:52:15,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845593587] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:15,329 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:15,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 20 [2021-11-23 16:52:15,330 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63930163] [2021-11-23 16:52:15,331 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:15,331 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:52:15,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:15,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:52:15,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:52:15,332 INFO L87 Difference]: Start difference. First operand 53 states and 73 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:16,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:16,989 INFO L93 Difference]: Finished difference Result 122 states and 176 transitions. [2021-11-23 16:52:16,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-11-23 16:52:16,990 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 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 17 [2021-11-23 16:52:16,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:16,991 INFO L225 Difference]: With dead ends: 122 [2021-11-23 16:52:16,991 INFO L226 Difference]: Without dead ends: 108 [2021-11-23 16:52:16,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1621 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1290, Invalid=4410, Unknown=0, NotChecked=0, Total=5700 [2021-11-23 16:52:16,996 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 142 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:16,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [142 Valid, 91 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:52:16,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-11-23 16:52:17,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 70. [2021-11-23 16:52:17,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.318840579710145) internal successors, (91), 69 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:17,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2021-11-23 16:52:17,030 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 17 [2021-11-23 16:52:17,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:17,032 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2021-11-23 16:52:17,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:17,033 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2021-11-23 16:52:17,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 16:52:17,034 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:17,035 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:17,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (28)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:17,257 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2021-11-23 16:52:17,443 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (27)] Ended with exit code 0 [2021-11-23 16:52:17,637 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:17,637 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:17,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:17,638 INFO L85 PathProgramCache]: Analyzing trace with hash -1333529985, now seen corresponding path program 8 times [2021-11-23 16:52:17,638 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:17,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [903288515] [2021-11-23 16:52:17,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:17,638 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:17,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:17,640 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:17,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-23 16:52:17,736 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:17,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:17,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:17,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:17,840 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:17,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:17,885 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:17,885 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:17,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [903288515] [2021-11-23 16:52:17,886 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [903288515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:17,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [79938832] [2021-11-23 16:52:17,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:17,886 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:17,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:17,887 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:17,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process [2021-11-23 16:52:17,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:17,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:17,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:17,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:18,043 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:18,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:18,076 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:18,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [79938832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:18,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196125937] [2021-11-23 16:52:18,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:18,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:18,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:18,080 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:18,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-23 16:52:18,129 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:18,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:18,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:52:18,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:18,183 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:18,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:18,219 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:18,220 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1196125937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:18,220 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:18,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7, 7] total 8 [2021-11-23 16:52:18,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864096269] [2021-11-23 16:52:18,220 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:18,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 16:52:18,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:18,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 16:52:18,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 16:52:18,222 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:18,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:18,295 INFO L93 Difference]: Finished difference Result 108 states and 136 transitions. [2021-11-23 16:52:18,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 16:52:18,295 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 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 18 [2021-11-23 16:52:18,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:18,297 INFO L225 Difference]: With dead ends: 108 [2021-11-23 16:52:18,297 INFO L226 Difference]: Without dead ends: 100 [2021-11-23 16:52:18,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:52:18,306 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 11 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:18,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 78 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:18,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-23 16:52:18,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2021-11-23 16:52:18,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.3506493506493507) internal successors, (104), 77 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 16:52:18,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 104 transitions. [2021-11-23 16:52:18,318 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 104 transitions. Word has length 18 [2021-11-23 16:52:18,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:18,318 INFO L470 AbstractCegarLoop]: Abstraction has 78 states and 104 transitions. [2021-11-23 16:52:18,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:18,319 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 104 transitions. [2021-11-23 16:52:18,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 16:52:18,320 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:18,320 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:18,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (30)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:18,551 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2021-11-23 16:52:18,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (31)] Ended with exit code 0 [2021-11-23 16:52:18,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:18,932 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:18,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:18,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1110269315, now seen corresponding path program 9 times [2021-11-23 16:52:18,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:18,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1854484769] [2021-11-23 16:52:18,933 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:18,933 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:18,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:18,934 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:18,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 16:52:19,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 16:52:19,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:19,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:19,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:19,110 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:19,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:19,294 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:19,294 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:19,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1854484769] [2021-11-23 16:52:19,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1854484769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:19,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1370557672] [2021-11-23 16:52:19,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:19,295 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:19,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:19,296 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:19,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 16:52:19,383 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 16:52:19,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:19,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:19,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:19,435 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:19,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:19,478 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:19,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1370557672] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:19,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428857491] [2021-11-23 16:52:19,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:19,478 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:19,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:19,479 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:19,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-23 16:52:19,524 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 16:52:19,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:19,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 16:52:19,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:19,564 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:19,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:19,602 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 16:52:19,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428857491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:19,603 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:19,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 20 [2021-11-23 16:52:19,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614547002] [2021-11-23 16:52:19,604 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:19,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:52:19,604 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:19,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:52:19,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:52:19,605 INFO L87 Difference]: Start difference. First operand 78 states and 104 transitions. Second operand has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:20,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:20,409 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2021-11-23 16:52:20,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-23 16:52:20,410 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 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 19 [2021-11-23 16:52:20,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:20,410 INFO L225 Difference]: With dead ends: 111 [2021-11-23 16:52:20,410 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 16:52:20,412 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=482, Invalid=2598, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 16:52:20,413 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 65 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:20,413 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 71 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:52:20,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 16:52:20,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 80. [2021-11-23 16:52:20,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.3291139240506329) internal successors, (105), 79 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:20,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 105 transitions. [2021-11-23 16:52:20,427 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 105 transitions. Word has length 19 [2021-11-23 16:52:20,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:20,428 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 105 transitions. [2021-11-23 16:52:20,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:20,428 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 105 transitions. [2021-11-23 16:52:20,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-23 16:52:20,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:20,430 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:20,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:20,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:20,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (34)] Ended with exit code 0 [2021-11-23 16:52:21,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:21,064 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:21,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:21,064 INFO L85 PathProgramCache]: Analyzing trace with hash -2017092107, now seen corresponding path program 10 times [2021-11-23 16:52:21,065 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:21,065 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1753317901] [2021-11-23 16:52:21,065 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:21,065 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:21,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:21,067 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:21,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-23 16:52:21,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:21,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:21,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:52:21,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:21,222 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:21,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:21,311 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:21,311 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:21,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1753317901] [2021-11-23 16:52:21,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1753317901] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:21,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1096710599] [2021-11-23 16:52:21,312 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:21,312 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:21,312 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:21,316 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:21,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-23 16:52:21,421 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:21,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:21,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:52:21,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:21,487 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:21,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:21,540 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:21,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1096710599] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:21,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1070732162] [2021-11-23 16:52:21,541 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:21,541 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:21,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:21,544 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:21,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-23 16:52:21,595 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:21,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:21,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 16:52:21,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:21,662 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:21,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:21,708 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:21,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1070732162] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:21,708 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:21,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8, 8] total 9 [2021-11-23 16:52:21,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284442425] [2021-11-23 16:52:21,709 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:21,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 16:52:21,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:21,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 16:52:21,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-23 16:52:21,711 INFO L87 Difference]: Start difference. First operand 80 states and 105 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:21,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:21,800 INFO L93 Difference]: Finished difference Result 123 states and 154 transitions. [2021-11-23 16:52:21,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 16:52:21,800 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 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 21 [2021-11-23 16:52:21,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:21,801 INFO L225 Difference]: With dead ends: 123 [2021-11-23 16:52:21,801 INFO L226 Difference]: Without dead ends: 114 [2021-11-23 16:52:21,801 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 110 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:52:21,802 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 16 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:21,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 115 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:21,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-23 16:52:21,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 90. [2021-11-23 16:52:21,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.348314606741573) internal successors, (120), 89 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:21,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 120 transitions. [2021-11-23 16:52:21,811 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 120 transitions. Word has length 21 [2021-11-23 16:52:21,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:21,812 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 120 transitions. [2021-11-23 16:52:21,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 9 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:21,812 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 120 transitions. [2021-11-23 16:52:21,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 16:52:21,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:21,813 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:21,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (36)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:22,046 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-23 16:52:22,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (37)] Ended with exit code 0 [2021-11-23 16:52:22,424 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:22,424 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:22,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:22,425 INFO L85 PathProgramCache]: Analyzing trace with hash -769603249, now seen corresponding path program 11 times [2021-11-23 16:52:22,425 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:22,425 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1116607320] [2021-11-23 16:52:22,425 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:22,425 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:22,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:22,426 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:22,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 16:52:22,467 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-23 16:52:22,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:22,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:52:22,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:22,621 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:22,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:22,696 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:22,696 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:22,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1116607320] [2021-11-23 16:52:22,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1116607320] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:22,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [778627838] [2021-11-23 16:52:22,696 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:22,696 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:22,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:22,697 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:22,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 16:52:22,780 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-23 16:52:22,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:22,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-23 16:52:22,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:22,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:22,896 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:22,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [778627838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:22,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67370380] [2021-11-23 16:52:22,896 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:22,896 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:22,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:22,897 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:22,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-23 16:52:22,957 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-23 16:52:22,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:22,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 16:52:22,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:23,031 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:23,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:23,253 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:23,253 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67370380] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:23,253 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:23,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 13, 13] total 24 [2021-11-23 16:52:23,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213637977] [2021-11-23 16:52:23,254 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:23,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 16:52:23,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:23,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 16:52:23,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-23 16:52:23,256 INFO L87 Difference]: Start difference. First operand 90 states and 120 transitions. Second operand has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 24 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:24,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:24,689 INFO L93 Difference]: Finished difference Result 155 states and 201 transitions. [2021-11-23 16:52:24,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-11-23 16:52:24,689 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 24 states have internal predecessors, (34), 0 states have call successors, (0), 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 22 [2021-11-23 16:52:24,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:24,691 INFO L225 Difference]: With dead ends: 155 [2021-11-23 16:52:24,692 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 16:52:24,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1382 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=851, Invalid=5001, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 16:52:24,695 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 88 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:24,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 97 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:52:24,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 16:52:24,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 96. [2021-11-23 16:52:24,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.3263157894736841) internal successors, (126), 95 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:24,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 126 transitions. [2021-11-23 16:52:24,714 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 126 transitions. Word has length 22 [2021-11-23 16:52:24,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:24,715 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 126 transitions. [2021-11-23 16:52:24,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 24 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:24,715 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 126 transitions. [2021-11-23 16:52:24,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 16:52:24,719 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:24,720 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:24,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:24,942 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (40)] Ended with exit code 0 [2021-11-23 16:52:25,148 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 16:52:25,341 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:25,342 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:25,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:25,342 INFO L85 PathProgramCache]: Analyzing trace with hash 1230457407, now seen corresponding path program 12 times [2021-11-23 16:52:25,342 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:25,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1927659124] [2021-11-23 16:52:25,342 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:25,343 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:25,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:25,344 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:25,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Waiting until timeout for monitored process [2021-11-23 16:52:25,387 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-23 16:52:25,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:25,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:25,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:25,508 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:25,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:25,576 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:25,577 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:25,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1927659124] [2021-11-23 16:52:25,577 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1927659124] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:25,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1805534276] [2021-11-23 16:52:25,577 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:25,578 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:25,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:25,579 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:25,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Waiting until timeout for monitored process [2021-11-23 16:52:25,712 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-23 16:52:25,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:25,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:25,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:25,790 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:25,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:25,846 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:25,847 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1805534276] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:25,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553604819] [2021-11-23 16:52:25,847 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:25,847 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:25,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:25,852 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:25,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-23 16:52:25,917 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-11-23 16:52:25,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:25,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:52:25,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:25,996 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:25,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:26,064 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:26,064 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [553604819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:26,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:26,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9, 9] total 10 [2021-11-23 16:52:26,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401313545] [2021-11-23 16:52:26,066 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:26,066 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 16:52:26,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:26,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 16:52:26,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-23 16:52:26,068 INFO L87 Difference]: Start difference. First operand 96 states and 126 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:26,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:26,206 INFO L93 Difference]: Finished difference Result 145 states and 181 transitions. [2021-11-23 16:52:26,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 16:52:26,207 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 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 24 [2021-11-23 16:52:26,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:26,208 INFO L225 Difference]: With dead ends: 145 [2021-11-23 16:52:26,208 INFO L226 Difference]: Without dead ends: 135 [2021-11-23 16:52:26,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 127 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:52:26,209 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 21 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:26,210 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 160 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:26,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-23 16:52:26,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 106. [2021-11-23 16:52:26,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.3428571428571427) internal successors, (141), 105 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:26,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 141 transitions. [2021-11-23 16:52:26,233 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 141 transitions. Word has length 24 [2021-11-23 16:52:26,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:26,233 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 141 transitions. [2021-11-23 16:52:26,233 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 10 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:26,234 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 141 transitions. [2021-11-23 16:52:26,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 16:52:26,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:26,234 INFO L514 BasicCegarLoop]: trace histogram [8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:26,236 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (43)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:26,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2021-11-23 16:52:26,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (42)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:26,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:26,837 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:26,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:26,837 INFO L85 PathProgramCache]: Analyzing trace with hash -1765909041, now seen corresponding path program 13 times [2021-11-23 16:52:26,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:26,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [830132971] [2021-11-23 16:52:26,838 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:26,838 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:26,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:26,839 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:26,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 16:52:26,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:26,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:26,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:27,012 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:27,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:27,260 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:27,260 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:27,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [830132971] [2021-11-23 16:52:27,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [830132971] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:27,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1208923017] [2021-11-23 16:52:27,261 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:27,261 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:27,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:27,261 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:27,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 16:52:27,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:27,352 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:27,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:27,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:27,456 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:27,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1208923017] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:27,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377702099] [2021-11-23 16:52:27,457 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:27,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:27,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:27,458 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:27,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-23 16:52:27,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:27,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:27,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:27,556 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:27,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:27,604 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:27,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [377702099] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:27,605 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:27,606 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15, 15] total 28 [2021-11-23 16:52:27,606 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514136839] [2021-11-23 16:52:27,606 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:27,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 16:52:27,607 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:27,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 16:52:27,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=610, Unknown=0, NotChecked=0, Total=756 [2021-11-23 16:52:27,608 INFO L87 Difference]: Start difference. First operand 106 states and 141 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 16:52:32,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:32,015 INFO L93 Difference]: Finished difference Result 282 states and 422 transitions. [2021-11-23 16:52:32,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-23 16:52:32,015 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 24 [2021-11-23 16:52:32,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:32,017 INFO L225 Difference]: With dead ends: 282 [2021-11-23 16:52:32,017 INFO L226 Difference]: Without dead ends: 267 [2021-11-23 16:52:32,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6285 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4075, Invalid=14285, Unknown=0, NotChecked=0, Total=18360 [2021-11-23 16:52:32,023 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 274 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 470 mSolverCounterSat, 566 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 566 IncrementalHoareTripleChecker+Valid, 470 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:32,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [274 Valid, 143 Invalid, 1036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [566 Valid, 470 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 16:52:32,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2021-11-23 16:52:32,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 136. [2021-11-23 16:52:32,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.3555555555555556) internal successors, (183), 135 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:32,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 183 transitions. [2021-11-23 16:52:32,042 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 183 transitions. Word has length 24 [2021-11-23 16:52:32,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:32,043 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 183 transitions. [2021-11-23 16:52:32,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 16:52:32,043 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 183 transitions. [2021-11-23 16:52:32,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 16:52:32,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:32,044 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:32,087 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:32,263 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (46)] Ended with exit code 0 [2021-11-23 16:52:32,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (45)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:32,662 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:32,662 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:32,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:32,662 INFO L85 PathProgramCache]: Analyzing trace with hash -1548087805, now seen corresponding path program 14 times [2021-11-23 16:52:32,662 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:32,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [290747539] [2021-11-23 16:52:32,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:32,663 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:32,663 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:32,664 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:32,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Waiting until timeout for monitored process [2021-11-23 16:52:32,726 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:32,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:32,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:32,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:32,870 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:32,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:33,181 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:33,181 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:33,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [290747539] [2021-11-23 16:52:33,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [290747539] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:33,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1702091258] [2021-11-23 16:52:33,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:33,181 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:33,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:33,182 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:33,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Waiting until timeout for monitored process [2021-11-23 16:52:33,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:33,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:33,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:33,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:33,343 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:33,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:33,388 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:33,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1702091258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:33,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691663621] [2021-11-23 16:52:33,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:52:33,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:33,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:33,390 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:33,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-23 16:52:33,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:52:33,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:33,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:52:33,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:33,489 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:33,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:33,540 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:33,540 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691663621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:33,540 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:33,540 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15, 15] total 28 [2021-11-23 16:52:33,540 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663937636] [2021-11-23 16:52:33,540 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:33,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 16:52:33,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:33,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 16:52:33,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=629, Unknown=0, NotChecked=0, Total=756 [2021-11-23 16:52:33,542 INFO L87 Difference]: Start difference. First operand 136 states and 183 transitions. Second operand has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 16:52:35,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:35,646 INFO L93 Difference]: Finished difference Result 214 states and 276 transitions. [2021-11-23 16:52:35,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-23 16:52:35,647 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 25 [2021-11-23 16:52:35,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:35,648 INFO L225 Difference]: With dead ends: 214 [2021-11-23 16:52:35,648 INFO L226 Difference]: Without dead ends: 185 [2021-11-23 16:52:35,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2640 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1391, Invalid=8709, Unknown=0, NotChecked=0, Total=10100 [2021-11-23 16:52:35,653 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 118 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 254 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:35,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 116 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [254 Valid, 341 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:52:35,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-23 16:52:35,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 142. [2021-11-23 16:52:35,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.3404255319148937) internal successors, (189), 141 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:35,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 189 transitions. [2021-11-23 16:52:35,674 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 189 transitions. Word has length 25 [2021-11-23 16:52:35,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:35,675 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 189 transitions. [2021-11-23 16:52:35,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 28 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 16:52:35,675 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 189 transitions. [2021-11-23 16:52:35,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 16:52:35,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:35,676 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:35,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (49)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:35,887 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (48)] Ended with exit code 0 [2021-11-23 16:52:36,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:36,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:36,280 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:36,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:36,280 INFO L85 PathProgramCache]: Analyzing trace with hash 881225141, now seen corresponding path program 15 times [2021-11-23 16:52:36,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:36,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [74373081] [2021-11-23 16:52:36,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:36,281 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:36,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:36,282 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:36,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 16:52:36,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:52:36,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:36,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:52:36,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:36,459 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:36,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:36,537 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:36,537 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:36,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [74373081] [2021-11-23 16:52:36,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [74373081] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:36,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [898647740] [2021-11-23 16:52:36,537 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:36,538 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:36,538 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:36,538 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:36,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 16:52:36,646 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:52:36,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:36,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:52:36,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:36,715 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:36,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:36,770 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:36,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [898647740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:36,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808958975] [2021-11-23 16:52:36,771 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:52:36,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:36,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:36,772 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:36,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-23 16:52:36,821 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:52:36,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:36,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:52:36,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:36,896 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:36,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:36,944 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:36,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808958975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:36,944 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:36,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10, 10] total 11 [2021-11-23 16:52:36,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093949042] [2021-11-23 16:52:36,945 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:36,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-23 16:52:36,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:36,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-23 16:52:36,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-23 16:52:36,947 INFO L87 Difference]: Start difference. First operand 142 states and 189 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:37,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:37,109 INFO L93 Difference]: Finished difference Result 209 states and 268 transitions. [2021-11-23 16:52:37,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 16:52:37,110 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 0 states have call successors, (0), 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 27 [2021-11-23 16:52:37,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:37,111 INFO L225 Difference]: With dead ends: 209 [2021-11-23 16:52:37,111 INFO L226 Difference]: Without dead ends: 198 [2021-11-23 16:52:37,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 144 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:52:37,112 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 26 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:37,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 213 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:37,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-11-23 16:52:37,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 157. [2021-11-23 16:52:37,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.358974358974359) internal successors, (212), 156 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 16:52:37,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 212 transitions. [2021-11-23 16:52:37,128 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 212 transitions. Word has length 27 [2021-11-23 16:52:37,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:37,128 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 212 transitions. [2021-11-23 16:52:37,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 11 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:37,129 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 212 transitions. [2021-11-23 16:52:37,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 16:52:37,130 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:37,130 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:37,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:37,339 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (51)] Ended with exit code 0 [2021-11-23 16:52:37,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-23 16:52:37,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:37,732 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:37,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:37,733 INFO L85 PathProgramCache]: Analyzing trace with hash -601429681, now seen corresponding path program 16 times [2021-11-23 16:52:37,733 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:37,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1162026287] [2021-11-23 16:52:37,733 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:37,733 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:37,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:37,734 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:37,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Waiting until timeout for monitored process [2021-11-23 16:52:37,788 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:37,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:37,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:52:37,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:37,972 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:37,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:38,057 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:38,057 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:38,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1162026287] [2021-11-23 16:52:38,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1162026287] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:38,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [340605424] [2021-11-23 16:52:38,058 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:38,058 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:38,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:38,059 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:38,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Waiting until timeout for monitored process [2021-11-23 16:52:38,190 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:38,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:38,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 16:52:38,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:38,248 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:38,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:38,331 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:38,332 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [340605424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:38,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547343986] [2021-11-23 16:52:38,332 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:52:38,332 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:38,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:38,334 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:38,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-23 16:52:38,376 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:52:38,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:38,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 16:52:38,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:38,447 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:38,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:38,765 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:52:38,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547343986] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:38,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:38,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 17, 17] total 32 [2021-11-23 16:52:38,765 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647522286] [2021-11-23 16:52:38,765 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:38,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 16:52:38,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:38,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 16:52:38,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=831, Unknown=0, NotChecked=0, Total=992 [2021-11-23 16:52:38,767 INFO L87 Difference]: Start difference. First operand 157 states and 212 transitions. Second operand has 32 states, 32 states have (on average 1.3125) internal successors, (42), 32 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 16:52:42,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:42,209 INFO L93 Difference]: Finished difference Result 272 states and 355 transitions. [2021-11-23 16:52:42,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-23 16:52:42,210 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.3125) internal successors, (42), 32 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 28 [2021-11-23 16:52:42,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:42,212 INFO L225 Difference]: With dead ends: 272 [2021-11-23 16:52:42,212 INFO L226 Difference]: Without dead ends: 236 [2021-11-23 16:52:42,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4613 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2146, Invalid=14110, Unknown=0, NotChecked=0, Total=16256 [2021-11-23 16:52:42,218 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 203 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 493 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 493 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:42,219 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 101 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [493 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 16:52:42,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-23 16:52:42,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 157. [2021-11-23 16:52:42,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.3653846153846154) internal successors, (213), 156 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:42,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 213 transitions. [2021-11-23 16:52:42,241 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 213 transitions. Word has length 28 [2021-11-23 16:52:42,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:42,241 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 213 transitions. [2021-11-23 16:52:42,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.3125) internal successors, (42), 32 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 16:52:42,242 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 213 transitions. [2021-11-23 16:52:42,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 16:52:42,242 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:42,243 INFO L514 BasicCegarLoop]: trace histogram [11, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:42,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2021-11-23 16:52:42,455 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (54)] Ended with exit code 0 [2021-11-23 16:52:42,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (55)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:42,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:42,848 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:42,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:42,848 INFO L85 PathProgramCache]: Analyzing trace with hash 2136777891, now seen corresponding path program 17 times [2021-11-23 16:52:42,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:42,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2134713512] [2021-11-23 16:52:42,849 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:42,849 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:42,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:42,850 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:42,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Waiting until timeout for monitored process [2021-11-23 16:52:42,922 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-23 16:52:42,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:42,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:52:42,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:43,082 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:43,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:43,368 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:43,368 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:43,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2134713512] [2021-11-23 16:52:43,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2134713512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:43,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1673235800] [2021-11-23 16:52:43,368 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:43,368 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:43,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:43,370 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:43,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Waiting until timeout for monitored process [2021-11-23 16:52:43,503 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-23 16:52:43,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:43,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:52:43,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:43,568 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:43,568 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:43,633 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 16:52:43,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1673235800] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:43,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411592296] [2021-11-23 16:52:43,634 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:52:43,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:43,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:43,638 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:43,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-23 16:52:43,690 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-23 16:52:43,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:43,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:52:43,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:43,882 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:43,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:44,089 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 16:52:44,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411592296] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:44,089 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:44,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 19, 19] total 37 [2021-11-23 16:52:44,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292492303] [2021-11-23 16:52:44,090 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:44,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 16:52:44,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:44,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 16:52:44,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=1086, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 16:52:44,092 INFO L87 Difference]: Start difference. First operand 157 states and 213 transitions. Second operand has 37 states, 37 states have (on average 1.7567567567567568) internal successors, (65), 37 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:54,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:54,547 INFO L93 Difference]: Finished difference Result 473 states and 703 transitions. [2021-11-23 16:52:54,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2021-11-23 16:52:54,548 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7567567567567568) internal successors, (65), 37 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-23 16:52:54,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:54,550 INFO L225 Difference]: With dead ends: 473 [2021-11-23 16:52:54,551 INFO L226 Difference]: Without dead ends: 450 [2021-11-23 16:52:54,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17434 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=9767, Invalid=36673, Unknown=0, NotChecked=0, Total=46440 [2021-11-23 16:52:54,557 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 569 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 1265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 569 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 2144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1265 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:54,558 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [569 Valid, 253 Invalid, 2144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1265 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:52:54,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-11-23 16:52:54,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 215. [2021-11-23 16:52:54,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.3691588785046729) internal successors, (293), 214 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:54,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 293 transitions. [2021-11-23 16:52:54,592 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 293 transitions. Word has length 29 [2021-11-23 16:52:54,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:54,593 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 293 transitions. [2021-11-23 16:52:54,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.7567567567567568) internal successors, (65), 37 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:54,593 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 293 transitions. [2021-11-23 16:52:54,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 16:52:54,594 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:54,594 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:54,597 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (58)] Ended with exit code 0 [2021-11-23 16:52:54,805 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (57)] Ended with exit code 0 [2021-11-23 16:52:55,022 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-23 16:52:55,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:55,197 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:55,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:55,197 INFO L85 PathProgramCache]: Analyzing trace with hash -2029727233, now seen corresponding path program 18 times [2021-11-23 16:52:55,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:55,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [315060571] [2021-11-23 16:52:55,198 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:55,198 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:55,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:55,199 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:55,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Waiting until timeout for monitored process [2021-11-23 16:52:55,297 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:52:55,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:55,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:52:55,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:55,466 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:55,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:55,554 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:55,554 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:55,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [315060571] [2021-11-23 16:52:55,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [315060571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:55,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1482067214] [2021-11-23 16:52:55,555 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:55,555 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:55,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:55,559 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:55,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Waiting until timeout for monitored process [2021-11-23 16:52:55,706 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:52:55,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:55,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:52:55,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:55,811 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:55,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:55,874 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:55,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1482067214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:55,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135824423] [2021-11-23 16:52:55,874 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:52:55,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:55,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:55,875 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:55,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-23 16:52:55,934 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-23 16:52:55,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:52:55,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:52:55,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:56,021 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:56,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:56,085 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:56,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135824423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:56,085 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:56,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11, 11] total 12 [2021-11-23 16:52:56,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237478410] [2021-11-23 16:52:56,086 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:56,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-23 16:52:56,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:56,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-23 16:52:56,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-23 16:52:56,087 INFO L87 Difference]: Start difference. First operand 215 states and 293 transitions. Second operand has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:56,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:52:56,268 INFO L93 Difference]: Finished difference Result 323 states and 434 transitions. [2021-11-23 16:52:56,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 16:52:56,269 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 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 30 [2021-11-23 16:52:56,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:52:56,271 INFO L225 Difference]: With dead ends: 323 [2021-11-23 16:52:56,271 INFO L226 Difference]: Without dead ends: 311 [2021-11-23 16:52:56,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 161 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-23 16:52:56,273 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 31 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:52:56,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 274 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:52:56,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-11-23 16:52:56,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 241. [2021-11-23 16:52:56,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.3916666666666666) internal successors, (334), 240 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 16:52:56,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 334 transitions. [2021-11-23 16:52:56,314 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 334 transitions. Word has length 30 [2021-11-23 16:52:56,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:52:56,314 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 334 transitions. [2021-11-23 16:52:56,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 12 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:52:56,315 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 334 transitions. [2021-11-23 16:52:56,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 16:52:56,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:52:56,316 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:52:56,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:56,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (61)] Ended with exit code 0 [2021-11-23 16:52:56,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (60)] Forceful destruction successful, exit code 0 [2021-11-23 16:52:56,932 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:52:56,932 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:52:56,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:52:56,932 INFO L85 PathProgramCache]: Analyzing trace with hash -760250749, now seen corresponding path program 19 times [2021-11-23 16:52:56,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:52:56,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [773940607] [2021-11-23 16:52:56,933 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:56,933 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:52:56,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:52:56,934 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:52:56,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Waiting until timeout for monitored process [2021-11-23 16:52:57,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:57,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:52:57,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:57,208 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:57,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:57,277 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:57,277 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:52:57,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [773940607] [2021-11-23 16:52:57,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [773940607] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:57,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1394140491] [2021-11-23 16:52:57,278 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:57,279 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:52:57,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:52:57,279 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:52:57,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Waiting until timeout for monitored process [2021-11-23 16:52:57,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:57,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 16:52:57,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:57,476 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:57,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:57,545 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:57,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1394140491] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:57,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870379499] [2021-11-23 16:52:57,545 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:52:57,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:52:57,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:52:57,547 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:52:57,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-23 16:52:57,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:52:57,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 16:52:57,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:52:57,686 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:57,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:52:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:52:58,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870379499] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:52:58,084 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:52:58,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 19, 19] total 36 [2021-11-23 16:52:58,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919299813] [2021-11-23 16:52:58,085 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:52:58,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-23 16:52:58,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:52:58,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-23 16:52:58,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1061, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 16:52:58,086 INFO L87 Difference]: Start difference. First operand 241 states and 334 transitions. Second operand has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:02,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:02,736 INFO L93 Difference]: Finished difference Result 362 states and 475 transitions. [2021-11-23 16:53:02,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-23 16:53:02,737 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 states have internal predecessors, (46), 0 states have call successors, (0), 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 31 [2021-11-23 16:53:02,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:02,739 INFO L225 Difference]: With dead ends: 362 [2021-11-23 16:53:02,739 INFO L226 Difference]: Without dead ends: 323 [2021-11-23 16:53:02,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 144 SyntacticMatches, 2 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7462 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3165, Invalid=21641, Unknown=0, NotChecked=0, Total=24806 [2021-11-23 16:53:02,743 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 191 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 574 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 574 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:02,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 117 Invalid, 961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [574 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 16:53:02,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-11-23 16:53:02,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 249. [2021-11-23 16:53:02,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.3830645161290323) internal successors, (343), 248 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:02,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 343 transitions. [2021-11-23 16:53:02,791 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 343 transitions. Word has length 31 [2021-11-23 16:53:02,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:02,791 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 343 transitions. [2021-11-23 16:53:02,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 36 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:02,792 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 343 transitions. [2021-11-23 16:53:02,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 16:53:02,792 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:02,793 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:02,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (63)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:03,006 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (64)] Ended with exit code 0 [2021-11-23 16:53:03,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:03,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:03,407 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:03,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:03,408 INFO L85 PathProgramCache]: Analyzing trace with hash 254889333, now seen corresponding path program 20 times [2021-11-23 16:53:03,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:03,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1610553172] [2021-11-23 16:53:03,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:53:03,408 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:03,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:03,409 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:03,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Waiting until timeout for monitored process [2021-11-23 16:53:03,473 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:53:03,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:03,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:53:03,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:03,621 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:03,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:03,725 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:03,725 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:03,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1610553172] [2021-11-23 16:53:03,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1610553172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:03,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1554467289] [2021-11-23 16:53:03,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:53:03,726 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:03,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:03,727 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:03,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Waiting until timeout for monitored process [2021-11-23 16:53:03,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:53:03,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:03,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:53:03,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:03,957 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:03,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:04,043 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:04,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1554467289] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:04,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410431607] [2021-11-23 16:53:04,048 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:53:04,048 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:04,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:04,049 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:04,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-23 16:53:04,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:53:04,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:04,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 16:53:04,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:04,205 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:04,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:04,270 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:04,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410431607] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:04,270 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:04,270 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12, 12] total 13 [2021-11-23 16:53:04,270 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139895097] [2021-11-23 16:53:04,271 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:04,271 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 16:53:04,271 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:04,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 16:53:04,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-11-23 16:53:04,272 INFO L87 Difference]: Start difference. First operand 249 states and 343 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:04,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:04,453 INFO L93 Difference]: Finished difference Result 365 states and 494 transitions. [2021-11-23 16:53:04,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 16:53:04,453 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 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 33 [2021-11-23 16:53:04,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:04,456 INFO L225 Difference]: With dead ends: 365 [2021-11-23 16:53:04,456 INFO L226 Difference]: Without dead ends: 352 [2021-11-23 16:53:04,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-23 16:53:04,458 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 36 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 297 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:04,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 343 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 297 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:53:04,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-23 16:53:04,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 276. [2021-11-23 16:53:04,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 275 states have (on average 1.4036363636363636) internal successors, (386), 275 states have internal predecessors, (386), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:04,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 386 transitions. [2021-11-23 16:53:04,518 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 386 transitions. Word has length 33 [2021-11-23 16:53:04,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:04,520 INFO L470 AbstractCegarLoop]: Abstraction has 276 states and 386 transitions. [2021-11-23 16:53:04,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:04,521 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 386 transitions. [2021-11-23 16:53:04,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 16:53:04,522 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:04,522 INFO L514 BasicCegarLoop]: trace histogram [13, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:04,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:04,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (67)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:04,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (66)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:05,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:05,148 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:05,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:05,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1327240340, now seen corresponding path program 21 times [2021-11-23 16:53:05,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:05,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2120180014] [2021-11-23 16:53:05,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:53:05,149 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:05,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:05,150 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:05,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Waiting until timeout for monitored process [2021-11-23 16:53:05,207 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:53:05,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:05,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:53:05,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:05,441 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:53:05,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:05,777 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:53:05,777 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:05,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2120180014] [2021-11-23 16:53:05,778 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2120180014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:05,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1031166784] [2021-11-23 16:53:05,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:53:05,778 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:05,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:05,779 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:05,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Waiting until timeout for monitored process [2021-11-23 16:53:05,893 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:53:05,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:05,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:53:05,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:53:05,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:06,039 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:53:06,039 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1031166784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:06,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409671928] [2021-11-23 16:53:06,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:53:06,040 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:06,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:06,041 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:06,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-23 16:53:06,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 16:53:06,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:06,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 16:53:06,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:06,146 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:53:06,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:06,207 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:53:06,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409671928] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:06,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:06,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15, 15] total 28 [2021-11-23 16:53:06,208 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134598279] [2021-11-23 16:53:06,208 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:06,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 16:53:06,209 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:06,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 16:53:06,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2021-11-23 16:53:06,210 INFO L87 Difference]: Start difference. First operand 276 states and 386 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:08,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:08,223 INFO L93 Difference]: Finished difference Result 426 states and 612 transitions. [2021-11-23 16:53:08,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-23 16:53:08,224 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 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 33 [2021-11-23 16:53:08,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:08,226 INFO L225 Difference]: With dead ends: 426 [2021-11-23 16:53:08,226 INFO L226 Difference]: Without dead ends: 358 [2021-11-23 16:53:08,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1183, Invalid=5137, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 16:53:08,230 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 191 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 368 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 692 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 368 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:08,232 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 76 Invalid, 692 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [368 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 16:53:08,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-23 16:53:08,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 149. [2021-11-23 16:53:08,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.1756756756756757) internal successors, (174), 148 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:08,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 174 transitions. [2021-11-23 16:53:08,278 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 174 transitions. Word has length 33 [2021-11-23 16:53:08,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:08,279 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 174 transitions. [2021-11-23 16:53:08,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:08,280 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 174 transitions. [2021-11-23 16:53:08,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 16:53:08,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:08,281 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:08,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (70)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:08,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:08,703 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (69)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:08,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:08,892 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:08,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:08,892 INFO L85 PathProgramCache]: Analyzing trace with hash 2116421967, now seen corresponding path program 22 times [2021-11-23 16:53:08,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:08,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1409066227] [2021-11-23 16:53:08,892 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:53:08,892 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:08,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:08,893 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:08,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Waiting until timeout for monitored process [2021-11-23 16:53:08,948 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:53:08,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:08,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:53:08,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:09,148 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:09,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:09,222 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:09,223 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:09,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1409066227] [2021-11-23 16:53:09,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1409066227] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:09,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1864787213] [2021-11-23 16:53:09,223 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:53:09,223 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:09,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:09,224 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:09,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Waiting until timeout for monitored process [2021-11-23 16:53:09,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:53:09,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:09,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-23 16:53:09,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:09,402 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:09,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:09,469 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:09,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1864787213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:09,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984124235] [2021-11-23 16:53:09,470 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:53:09,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:09,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:09,471 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:09,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-23 16:53:09,546 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:53:09,546 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:09,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:53:09,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:09,641 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:09,641 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:10,089 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:53:10,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [984124235] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:10,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:10,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 21, 21] total 40 [2021-11-23 16:53:10,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887138755] [2021-11-23 16:53:10,090 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:10,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 16:53:10,091 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:10,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 16:53:10,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1319, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 16:53:10,092 INFO L87 Difference]: Start difference. First operand 149 states and 174 transitions. Second operand has 40 states, 40 states have (on average 1.25) internal successors, (50), 40 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:16,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:16,051 INFO L93 Difference]: Finished difference Result 333 states and 396 transitions. [2021-11-23 16:53:16,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 164 states. [2021-11-23 16:53:16,051 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.25) internal successors, (50), 40 states have internal predecessors, (50), 0 states have call successors, (0), 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 34 [2021-11-23 16:53:16,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:16,053 INFO L225 Difference]: With dead ends: 333 [2021-11-23 16:53:16,053 INFO L226 Difference]: Without dead ends: 290 [2021-11-23 16:53:16,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 158 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11453 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4502, Invalid=31788, Unknown=0, NotChecked=0, Total=36290 [2021-11-23 16:53:16,056 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 222 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 706 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 1267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 706 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:16,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [222 Valid, 159 Invalid, 1267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [706 Valid, 561 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 16:53:16,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2021-11-23 16:53:16,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 153. [2021-11-23 16:53:16,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.1907894736842106) internal successors, (181), 152 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:16,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 181 transitions. [2021-11-23 16:53:16,099 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 181 transitions. Word has length 34 [2021-11-23 16:53:16,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:16,099 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 181 transitions. [2021-11-23 16:53:16,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.25) internal successors, (50), 40 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:16,100 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 181 transitions. [2021-11-23 16:53:16,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 16:53:16,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:16,101 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:16,102 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (73)] Ended with exit code 0 [2021-11-23 16:53:16,310 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (72)] Ended with exit code 0 [2021-11-23 16:53:16,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2021-11-23 16:53:16,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:16,703 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:16,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:16,703 INFO L85 PathProgramCache]: Analyzing trace with hash -638809665, now seen corresponding path program 23 times [2021-11-23 16:53:16,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:16,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1648768979] [2021-11-23 16:53:16,704 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:53:16,704 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:16,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:16,705 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:16,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Waiting until timeout for monitored process [2021-11-23 16:53:16,777 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:53:16,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:16,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:53:16,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:16,941 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:16,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:17,007 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:17,008 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:17,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1648768979] [2021-11-23 16:53:17,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1648768979] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:17,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1403633465] [2021-11-23 16:53:17,008 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:53:17,008 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:17,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:17,009 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:17,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Waiting until timeout for monitored process [2021-11-23 16:53:17,154 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:53:17,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:17,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:53:17,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:17,226 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:17,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:17,283 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:17,283 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1403633465] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:17,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460277201] [2021-11-23 16:53:17,283 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:53:17,284 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:17,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:17,284 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:17,285 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-23 16:53:17,345 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-11-23 16:53:17,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:17,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:53:17,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:17,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:17,554 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:17,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460277201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:17,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:17,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13, 14] total 15 [2021-11-23 16:53:17,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487501363] [2021-11-23 16:53:17,555 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:17,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 16:53:17,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:17,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 16:53:17,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-11-23 16:53:17,556 INFO L87 Difference]: Start difference. First operand 153 states and 181 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:17,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:17,738 INFO L93 Difference]: Finished difference Result 193 states and 222 transitions. [2021-11-23 16:53:17,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 16:53:17,739 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 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 16:53:17,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:17,739 INFO L225 Difference]: With dead ends: 193 [2021-11-23 16:53:17,739 INFO L226 Difference]: Without dead ends: 179 [2021-11-23 16:53:17,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:53:17,740 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 14 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:17,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 184 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 16:53:17,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-23 16:53:17,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 162. [2021-11-23 16:53:17,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.186335403726708) internal successors, (191), 161 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:17,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 191 transitions. [2021-11-23 16:53:17,772 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 191 transitions. Word has length 36 [2021-11-23 16:53:17,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:17,772 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 191 transitions. [2021-11-23 16:53:17,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:17,773 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 191 transitions. [2021-11-23 16:53:17,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 16:53:17,773 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:17,773 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:17,813 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:18,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (76)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:18,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (75)] Ended with exit code 0 [2021-11-23 16:53:18,399 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:53:18,400 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:18,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:18,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1624133885, now seen corresponding path program 24 times [2021-11-23 16:53:18,400 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:18,400 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2020740976] [2021-11-23 16:53:18,400 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:53:18,400 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:18,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:18,401 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:18,402 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Waiting until timeout for monitored process [2021-11-23 16:53:18,473 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-23 16:53:18,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:18,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:53:18,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:18,738 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:18,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:19,258 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:19,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:19,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2020740976] [2021-11-23 16:53:19,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2020740976] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:19,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1339335590] [2021-11-23 16:53:19,259 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:53:19,259 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:19,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:19,260 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:19,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Waiting until timeout for monitored process [2021-11-23 16:53:19,414 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-23 16:53:19,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:19,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:53:19,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:19,486 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:19,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:19,546 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:19,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1339335590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:19,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170782190] [2021-11-23 16:53:19,546 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:53:19,546 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:19,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:19,547 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:19,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-23 16:53:19,604 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-11-23 16:53:19,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:19,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 16:53:19,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:19,689 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:19,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:19,764 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:53:19,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170782190] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:19,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:19,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23, 23] total 44 [2021-11-23 16:53:19,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647421436] [2021-11-23 16:53:19,766 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:19,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-23 16:53:19,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:19,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-23 16:53:19,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1605, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 16:53:19,768 INFO L87 Difference]: Start difference. First operand 162 states and 191 transitions. Second operand has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:27,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:27,988 INFO L93 Difference]: Finished difference Result 414 states and 492 transitions. [2021-11-23 16:53:27,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 197 states. [2021-11-23 16:53:27,989 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 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 16:53:27,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:27,991 INFO L225 Difference]: With dead ends: 414 [2021-11-23 16:53:27,991 INFO L226 Difference]: Without dead ends: 361 [2021-11-23 16:53:27,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16897 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=6216, Invalid=45086, Unknown=0, NotChecked=0, Total=51302 [2021-11-23 16:53:27,996 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 316 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 681 mSolverCounterSat, 1109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 1790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1109 IncrementalHoareTripleChecker+Valid, 681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:27,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 156 Invalid, 1790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1109 Valid, 681 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 16:53:27,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2021-11-23 16:53:28,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 166. [2021-11-23 16:53:28,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.206060606060606) internal successors, (199), 165 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:28,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 199 transitions. [2021-11-23 16:53:28,047 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 199 transitions. Word has length 37 [2021-11-23 16:53:28,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:28,048 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 199 transitions. [2021-11-23 16:53:28,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.1818181818181819) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:28,048 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 199 transitions. [2021-11-23 16:53:28,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-23 16:53:28,049 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:28,049 INFO L514 BasicCegarLoop]: trace histogram [16, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:28,067 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (78)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:28,265 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (79)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:28,486 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2021-11-23 16:53:28,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:28,663 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:28,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:28,664 INFO L85 PathProgramCache]: Analyzing trace with hash -2133980802, now seen corresponding path program 25 times [2021-11-23 16:53:28,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:28,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1097015774] [2021-11-23 16:53:28,664 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:53:28,664 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:28,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:28,665 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:28,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Waiting until timeout for monitored process [2021-11-23 16:53:28,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:28,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:53:28,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:29,060 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:53:29,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:29,922 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:53:29,922 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:29,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1097015774] [2021-11-23 16:53:29,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1097015774] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:29,922 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1720041561] [2021-11-23 16:53:29,922 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:53:29,922 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:29,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:29,923 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:29,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Waiting until timeout for monitored process [2021-11-23 16:53:30,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:30,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:53:30,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:30,161 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:53:30,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:30,240 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 157 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:53:30,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1720041561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:30,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483522115] [2021-11-23 16:53:30,240 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:53:30,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:30,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:53:30,241 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:53:30,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-23 16:53:30,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:53:30,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:53:30,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:30,375 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:53:30,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:30,503 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 16:53:30,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483522115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:30,503 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:53:30,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 19, 19] total 51 [2021-11-23 16:53:30,504 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231866253] [2021-11-23 16:53:30,504 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:53:30,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 16:53:30,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:53:30,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 16:53:30,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=446, Invalid=2104, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 16:53:30,506 INFO L87 Difference]: Start difference. First operand 166 states and 199 transitions. Second operand has 51 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 51 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:58,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:53:58,823 INFO L93 Difference]: Finished difference Result 958 states and 1164 transitions. [2021-11-23 16:53:58,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 348 states. [2021-11-23 16:53:58,823 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 51 states have internal predecessors, (83), 0 states have call successors, (0), 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 16:53:58,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:53:58,828 INFO L225 Difference]: With dead ends: 958 [2021-11-23 16:53:58,828 INFO L226 Difference]: Without dead ends: 946 [2021-11-23 16:53:58,836 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 550 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 377 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58765 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=28700, Invalid=114562, Unknown=0, NotChecked=0, Total=143262 [2021-11-23 16:53:58,836 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 1072 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 1625 mSolverCounterSat, 3323 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1072 SdHoareTripleChecker+Valid, 410 SdHoareTripleChecker+Invalid, 4948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3323 IncrementalHoareTripleChecker+Valid, 1625 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:53:58,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1072 Valid, 410 Invalid, 4948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3323 Valid, 1625 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 16:53:58,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 946 states. [2021-11-23 16:53:58,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 946 to 255. [2021-11-23 16:53:58,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 254 states have (on average 1.236220472440945) internal successors, (314), 254 states have internal predecessors, (314), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:58,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 314 transitions. [2021-11-23 16:53:58,923 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 314 transitions. Word has length 38 [2021-11-23 16:53:58,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:53:58,924 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 314 transitions. [2021-11-23 16:53:58,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.6274509803921569) internal successors, (83), 51 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:53:58,924 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 314 transitions. [2021-11-23 16:53:58,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 16:53:58,925 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:53:58,925 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:53:58,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (82)] Forceful destruction successful, exit code 0 [2021-11-23 16:53:59,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (81)] Ended with exit code 0 [2021-11-23 16:53:59,350 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2021-11-23 16:53:59,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:53:59,526 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:53:59,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:53:59,526 INFO L85 PathProgramCache]: Analyzing trace with hash 1220951349, now seen corresponding path program 26 times [2021-11-23 16:53:59,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:53:59,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1671566675] [2021-11-23 16:53:59,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:53:59,527 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:53:59,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:53:59,528 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:53:59,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Waiting until timeout for monitored process [2021-11-23 16:53:59,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:53:59,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:53:59,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:53:59,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:53:59,817 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:53:59,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:53:59,903 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:53:59,903 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:53:59,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1671566675] [2021-11-23 16:53:59,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1671566675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:53:59,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1835444332] [2021-11-23 16:53:59,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:53:59,903 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:53:59,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:53:59,904 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:53:59,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Waiting until timeout for monitored process [2021-11-23 16:54:00,068 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:54:00,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:00,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:54:00,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:00,165 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:00,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:00,236 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:00,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1835444332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:00,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989663336] [2021-11-23 16:54:00,236 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:54:00,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:00,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:00,237 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:00,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2021-11-23 16:54:00,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:54:00,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:00,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 16:54:00,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:00,444 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:00,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:00,525 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:00,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989663336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:00,525 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:00,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14, 14] total 15 [2021-11-23 16:54:00,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589508262] [2021-11-23 16:54:00,526 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:00,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 16:54:00,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:00,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 16:54:00,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-11-23 16:54:00,527 INFO L87 Difference]: Start difference. First operand 255 states and 314 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:00,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:00,821 INFO L93 Difference]: Finished difference Result 325 states and 387 transitions. [2021-11-23 16:54:00,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 16:54:00,822 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 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 16:54:00,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:00,823 INFO L225 Difference]: With dead ends: 325 [2021-11-23 16:54:00,823 INFO L226 Difference]: Without dead ends: 310 [2021-11-23 16:54:00,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 212 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:54:00,824 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 17 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:00,824 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 253 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:54:00,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-23 16:54:00,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 266. [2021-11-23 16:54:00,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 1.2339622641509433) internal successors, (327), 265 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:00,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 327 transitions. [2021-11-23 16:54:00,914 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 327 transitions. Word has length 39 [2021-11-23 16:54:00,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:00,915 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 327 transitions. [2021-11-23 16:54:00,915 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:00,915 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 327 transitions. [2021-11-23 16:54:00,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 16:54:00,916 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:00,917 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:00,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (84)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:01,132 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (85)] Ended with exit code 0 [2021-11-23 16:54:01,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:01,531 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:01,531 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:01,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:01,532 INFO L85 PathProgramCache]: Analyzing trace with hash 52046159, now seen corresponding path program 27 times [2021-11-23 16:54:01,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:01,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1553406965] [2021-11-23 16:54:01,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:54:01,532 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:01,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:01,533 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:01,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Waiting until timeout for monitored process [2021-11-23 16:54:01,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 16:54:01,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:01,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:54:01,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:01,991 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:01,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:02,812 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:02,812 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:02,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1553406965] [2021-11-23 16:54:02,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1553406965] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:02,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1598023433] [2021-11-23 16:54:02,812 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:54:02,812 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:02,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:02,813 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:02,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Waiting until timeout for monitored process [2021-11-23 16:54:03,007 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 16:54:03,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:03,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:54:03,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:03,086 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:03,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:03,161 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:03,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1598023433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:03,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [654606214] [2021-11-23 16:54:03,162 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:54:03,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:03,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:03,162 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:03,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2021-11-23 16:54:03,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 16:54:03,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:03,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 16:54:03,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:03,351 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:03,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:03,462 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:54:03,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [654606214] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:03,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:03,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25, 25] total 48 [2021-11-23 16:54:03,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722974725] [2021-11-23 16:54:03,464 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:03,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 16:54:03,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:03,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 16:54:03,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=1919, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 16:54:03,467 INFO L87 Difference]: Start difference. First operand 266 states and 327 transitions. Second operand has 48 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 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 16:54:15,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:15,929 INFO L93 Difference]: Finished difference Result 498 states and 591 transitions. [2021-11-23 16:54:15,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2021-11-23 16:54:15,930 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 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 40 [2021-11-23 16:54:15,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:15,932 INFO L225 Difference]: With dead ends: 498 [2021-11-23 16:54:15,932 INFO L226 Difference]: Without dead ends: 439 [2021-11-23 16:54:15,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23941 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=8371, Invalid=62119, Unknown=0, NotChecked=0, Total=70490 [2021-11-23 16:54:15,937 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 352 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 706 mSolverCounterSat, 1337 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 2043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1337 IncrementalHoareTripleChecker+Valid, 706 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:15,937 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 193 Invalid, 2043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1337 Valid, 706 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 16:54:15,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-11-23 16:54:16,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 277. [2021-11-23 16:54:16,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 276 states have (on average 1.2318840579710144) internal successors, (340), 276 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:16,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 340 transitions. [2021-11-23 16:54:16,029 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 340 transitions. Word has length 40 [2021-11-23 16:54:16,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:16,030 INFO L470 AbstractCegarLoop]: Abstraction has 277 states and 340 transitions. [2021-11-23 16:54:16,030 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 48 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 16:54:16,030 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 340 transitions. [2021-11-23 16:54:16,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 16:54:16,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:16,031 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:16,077 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2021-11-23 16:54:16,249 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (88)] Ended with exit code 0 [2021-11-23 16:54:16,456 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (87)] Ended with exit code 0 [2021-11-23 16:54:16,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:16,648 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:16,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:16,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1735291263, now seen corresponding path program 28 times [2021-11-23 16:54:16,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:16,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [762411050] [2021-11-23 16:54:16,649 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:54:16,649 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:16,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:16,650 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:16,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Waiting until timeout for monitored process [2021-11-23 16:54:16,754 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:54:16,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:16,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:54:16,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:16,945 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:54:16,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:17,034 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:54:17,034 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:17,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [762411050] [2021-11-23 16:54:17,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [762411050] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:17,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1024889192] [2021-11-23 16:54:17,034 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:54:17,035 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:17,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:17,035 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:17,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Waiting until timeout for monitored process [2021-11-23 16:54:17,252 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:54:17,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:17,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:54:17,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:17,348 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:54:17,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:17,430 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:54:17,430 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1024889192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:17,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339069923] [2021-11-23 16:54:17,430 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:54:17,430 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:17,430 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:17,431 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:17,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2021-11-23 16:54:17,492 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:54:17,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:17,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-23 16:54:17,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:17,578 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:54:17,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:17,658 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:54:17,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339069923] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:17,659 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:17,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15, 15] total 16 [2021-11-23 16:54:17,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442392632] [2021-11-23 16:54:17,659 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:17,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 16:54:17,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:17,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 16:54:17,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-11-23 16:54:17,660 INFO L87 Difference]: Start difference. First operand 277 states and 340 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:17,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:54:17,953 INFO L93 Difference]: Finished difference Result 353 states and 419 transitions. [2021-11-23 16:54:17,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 16:54:17,953 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 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 16:54:17,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:54:17,955 INFO L225 Difference]: With dead ends: 353 [2021-11-23 16:54:17,955 INFO L226 Difference]: Without dead ends: 337 [2021-11-23 16:54:17,956 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 229 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:54:17,956 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 22 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 16:54:17,957 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 305 Invalid, 420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 16:54:17,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2021-11-23 16:54:18,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 288. [2021-11-23 16:54:18,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 287 states have (on average 1.2299651567944252) internal successors, (353), 287 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:18,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 353 transitions. [2021-11-23 16:54:18,027 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 353 transitions. Word has length 42 [2021-11-23 16:54:18,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:54:18,028 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 353 transitions. [2021-11-23 16:54:18,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:54:18,028 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 353 transitions. [2021-11-23 16:54:18,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 16:54:18,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:54:18,029 INFO L514 BasicCegarLoop]: trace histogram [18, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:54:18,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (91)] Forceful destruction successful, exit code 0 [2021-11-23 16:54:18,252 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2021-11-23 16:54:18,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (90)] Ended with exit code 0 [2021-11-23 16:54:18,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:54:18,632 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:54:18,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:54:18,633 INFO L85 PathProgramCache]: Analyzing trace with hash 1894167471, now seen corresponding path program 29 times [2021-11-23 16:54:18,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:54:18,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1906492577] [2021-11-23 16:54:18,633 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:54:18,633 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:54:18,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:54:18,634 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:54:18,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Waiting until timeout for monitored process [2021-11-23 16:54:18,736 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-23 16:54:18,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:18,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:54:18,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:18,981 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:54:18,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:19,488 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:54:19,488 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:54:19,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1906492577] [2021-11-23 16:54:19,488 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1906492577] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:19,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1386871955] [2021-11-23 16:54:19,489 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:54:19,489 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:54:19,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:54:19,490 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:54:19,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Waiting until timeout for monitored process [2021-11-23 16:54:19,673 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-23 16:54:19,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:19,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:54:19,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:19,752 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:54:19,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:19,830 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 16:54:19,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1386871955] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:19,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863733477] [2021-11-23 16:54:19,831 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:54:19,831 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:54:19,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:54:19,832 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:54:19,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2021-11-23 16:54:19,908 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-23 16:54:19,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:54:19,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:54:19,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:54:20,217 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:54:20,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:54:20,647 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 199 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 16:54:20,647 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863733477] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:54:20,647 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:54:20,647 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 29, 29] total 57 [2021-11-23 16:54:20,648 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429745955] [2021-11-23 16:54:20,648 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:54:20,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-23 16:54:20,648 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:54:20,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-23 16:54:20,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=2646, Unknown=0, NotChecked=0, Total=3192 [2021-11-23 16:54:20,650 INFO L87 Difference]: Start difference. First operand 288 states and 353 transitions. Second operand has 57 states, 57 states have (on average 1.5964912280701755) internal successors, (91), 57 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:00,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:00,413 INFO L93 Difference]: Finished difference Result 1161 states and 1391 transitions. [2021-11-23 16:55:00,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 431 states. [2021-11-23 16:55:00,414 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.5964912280701755) internal successors, (91), 57 states have internal predecessors, (91), 0 states have call successors, (0), 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 16:55:00,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:00,419 INFO L225 Difference]: With dead ends: 1161 [2021-11-23 16:55:00,419 INFO L226 Difference]: Without dead ends: 1148 [2021-11-23 16:55:00,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 464 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92195 ImplicationChecksByTransitivity, 37.8s TimeCoverageRelationStatistics Valid=42824, Invalid=173866, Unknown=0, NotChecked=0, Total=216690 [2021-11-23 16:55:00,428 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 1043 mSDsluCounter, 523 mSDsCounter, 0 mSdLazyCounter, 2381 mSolverCounterSat, 3917 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1043 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 6298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3917 IncrementalHoareTripleChecker+Valid, 2381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:00,429 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1043 Valid, 544 Invalid, 6298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3917 Valid, 2381 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 16:55:00,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1148 states. [2021-11-23 16:55:00,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1148 to 350. [2021-11-23 16:55:00,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 349 states have (on average 1.2177650429799427) internal successors, (425), 349 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:00,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 425 transitions. [2021-11-23 16:55:00,518 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 425 transitions. Word has length 42 [2021-11-23 16:55:00,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:00,518 INFO L470 AbstractCegarLoop]: Abstraction has 350 states and 425 transitions. [2021-11-23 16:55:00,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.5964912280701755) internal successors, (91), 57 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:00,519 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 425 transitions. [2021-11-23 16:55:00,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 16:55:00,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:00,520 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:00,541 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2021-11-23 16:55:00,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (94)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:00,931 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (93)] Ended with exit code 0 [2021-11-23 16:55:01,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:55:01,124 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:01,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:01,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1285251197, now seen corresponding path program 30 times [2021-11-23 16:55:01,124 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:01,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [823675896] [2021-11-23 16:55:01,124 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:55:01,124 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:01,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:01,125 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:01,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Waiting until timeout for monitored process [2021-11-23 16:55:01,217 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 16:55:01,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:01,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:55:01,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:01,581 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:55:01,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:02,332 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:55:02,332 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:02,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [823675896] [2021-11-23 16:55:02,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [823675896] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:02,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1323410385] [2021-11-23 16:55:02,333 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:55:02,333 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:02,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:02,334 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:02,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Waiting until timeout for monitored process [2021-11-23 16:55:02,517 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 16:55:02,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:02,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:55:02,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:02,587 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:55:02,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:02,661 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:55:02,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1323410385] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:02,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149448284] [2021-11-23 16:55:02,662 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:55:02,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:02,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:02,664 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:02,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2021-11-23 16:55:02,739 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-23 16:55:02,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:02,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 16:55:02,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:02,811 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:55:02,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:02,901 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 16:55:02,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149448284] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:02,901 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:02,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27, 27] total 52 [2021-11-23 16:55:02,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456978407] [2021-11-23 16:55:02,902 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:02,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-23 16:55:02,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:02,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-23 16:55:02,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=2261, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 16:55:02,903 INFO L87 Difference]: Start difference. First operand 350 states and 425 transitions. Second operand has 52 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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 16:55:18,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:18,476 INFO L93 Difference]: Finished difference Result 615 states and 722 transitions. [2021-11-23 16:55:18,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 272 states. [2021-11-23 16:55:18,477 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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 43 [2021-11-23 16:55:18,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:18,479 INFO L225 Difference]: With dead ends: 615 [2021-11-23 16:55:18,479 INFO L226 Difference]: Without dead ends: 551 [2021-11-23 16:55:18,484 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 306 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32997 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=11036, Invalid=83520, Unknown=0, NotChecked=0, Total=94556 [2021-11-23 16:55:18,485 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 426 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 766 mSolverCounterSat, 1868 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 426 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 2634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1868 IncrementalHoareTripleChecker+Valid, 766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:18,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [426 Valid, 163 Invalid, 2634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1868 Valid, 766 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 16:55:18,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-11-23 16:55:18,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 362. [2021-11-23 16:55:18,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 361 states have (on average 1.2160664819944598) internal successors, (439), 361 states have internal predecessors, (439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:18,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 439 transitions. [2021-11-23 16:55:18,589 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 439 transitions. Word has length 43 [2021-11-23 16:55:18,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:18,589 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 439 transitions. [2021-11-23 16:55:18,589 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.1538461538461537) internal successors, (60), 52 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 16:55:18,589 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 439 transitions. [2021-11-23 16:55:18,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-23 16:55:18,590 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:18,590 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:18,591 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (97)] Ended with exit code 0 [2021-11-23 16:55:18,798 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (96)] Ended with exit code 0 [2021-11-23 16:55:19,011 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2021-11-23 16:55:19,191 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:19,191 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:19,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:19,191 INFO L85 PathProgramCache]: Analyzing trace with hash 1833254133, now seen corresponding path program 31 times [2021-11-23 16:55:19,192 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:19,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1427853020] [2021-11-23 16:55:19,192 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:55:19,192 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:19,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:19,193 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:19,194 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Waiting until timeout for monitored process [2021-11-23 16:55:19,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:19,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:55:19,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:19,499 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:19,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:19,589 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:19,589 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:19,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1427853020] [2021-11-23 16:55:19,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1427853020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:19,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [370518241] [2021-11-23 16:55:19,590 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:55:19,590 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:19,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:19,591 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:19,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Waiting until timeout for monitored process [2021-11-23 16:55:19,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:19,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:55:19,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:19,908 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:19,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:20,001 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:20,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [370518241] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:20,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706468260] [2021-11-23 16:55:20,002 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:55:20,002 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:20,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:20,003 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:20,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2021-11-23 16:55:20,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:55:20,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:55:20,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:20,226 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:20,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:20,437 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:20,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706468260] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:20,437 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:20,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16, 16] total 17 [2021-11-23 16:55:20,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340622738] [2021-11-23 16:55:20,438 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:20,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 16:55:20,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:20,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 16:55:20,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-11-23 16:55:20,440 INFO L87 Difference]: Start difference. First operand 362 states and 439 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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 16:55:20,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:20,848 INFO L93 Difference]: Finished difference Result 491 states and 579 transitions. [2021-11-23 16:55:20,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 16:55:20,848 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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 45 [2021-11-23 16:55:20,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:20,851 INFO L225 Difference]: With dead ends: 491 [2021-11-23 16:55:20,851 INFO L226 Difference]: Without dead ends: 474 [2021-11-23 16:55:20,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 246 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:55:20,852 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 31 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 450 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:20,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 450 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:55:20,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2021-11-23 16:55:20,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 392. [2021-11-23 16:55:20,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 391 states have (on average 1.2225063938618925) internal successors, (478), 391 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:20,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 478 transitions. [2021-11-23 16:55:20,996 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 478 transitions. Word has length 45 [2021-11-23 16:55:20,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:20,996 INFO L470 AbstractCegarLoop]: Abstraction has 392 states and 478 transitions. [2021-11-23 16:55:20,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 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 16:55:20,996 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 478 transitions. [2021-11-23 16:55:20,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 16:55:20,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:20,998 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:21,012 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (99)] Ended with exit code 0 [2021-11-23 16:55:21,231 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2021-11-23 16:55:21,412 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (100)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:21,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:21,611 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:21,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:21,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1409332913, now seen corresponding path program 32 times [2021-11-23 16:55:21,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:21,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1812877548] [2021-11-23 16:55:21,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:55:21,612 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:21,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:21,614 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:21,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Waiting until timeout for monitored process [2021-11-23 16:55:21,725 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:55:21,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:21,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:55:21,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:22,164 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:22,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:23,094 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:23,094 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:23,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1812877548] [2021-11-23 16:55:23,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1812877548] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:23,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [197312518] [2021-11-23 16:55:23,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:55:23,095 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:23,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:23,096 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:23,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Waiting until timeout for monitored process [2021-11-23 16:55:23,275 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:55:23,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:23,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:55:23,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:23,385 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:23,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:23,467 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:23,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [197312518] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:23,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674410684] [2021-11-23 16:55:23,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:55:23,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:23,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:23,469 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:23,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2021-11-23 16:55:23,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:55:23,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:23,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 16:55:23,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:23,638 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:23,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:23,724 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 16:55:23,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674410684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:23,724 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:23,724 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29, 29] total 56 [2021-11-23 16:55:23,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516790771] [2021-11-23 16:55:23,725 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:23,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 16:55:23,725 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:23,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 16:55:23,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=2631, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 16:55:23,727 INFO L87 Difference]: Start difference. First operand 392 states and 478 transitions. Second operand has 56 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:44,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:44,854 INFO L93 Difference]: Finished difference Result 739 states and 874 transitions. [2021-11-23 16:55:44,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 314 states. [2021-11-23 16:55:44,855 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 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 46 [2021-11-23 16:55:44,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:44,859 INFO L225 Difference]: With dead ends: 739 [2021-11-23 16:55:44,859 INFO L226 Difference]: Without dead ends: 663 [2021-11-23 16:55:44,867 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 567 GetRequests, 216 SyntacticMatches, 0 SemanticMatches, 351 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44614 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=14285, Invalid=109971, Unknown=0, NotChecked=0, Total=124256 [2021-11-23 16:55:44,867 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 451 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 960 mSolverCounterSat, 1870 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 451 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 2830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1870 IncrementalHoareTripleChecker+Valid, 960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:44,868 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [451 Valid, 210 Invalid, 2830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1870 Valid, 960 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 16:55:44,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2021-11-23 16:55:45,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 394. [2021-11-23 16:55:45,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 394 states, 393 states have (on average 1.2290076335877862) internal successors, (483), 393 states have internal predecessors, (483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:45,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 483 transitions. [2021-11-23 16:55:45,059 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 483 transitions. Word has length 46 [2021-11-23 16:55:45,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:45,060 INFO L470 AbstractCegarLoop]: Abstraction has 394 states and 483 transitions. [2021-11-23 16:55:45,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 56 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:45,060 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 483 transitions. [2021-11-23 16:55:45,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 16:55:45,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:45,062 INFO L514 BasicCegarLoop]: trace histogram [21, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:45,099 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2021-11-23 16:55:45,276 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (102)] Ended with exit code 0 [2021-11-23 16:55:45,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (103)] Ended with exit code 0 [2021-11-23 16:55:45,667 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:45,668 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:45,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:45,668 INFO L85 PathProgramCache]: Analyzing trace with hash 924847043, now seen corresponding path program 33 times [2021-11-23 16:55:45,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:45,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [557019401] [2021-11-23 16:55:45,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:55:45,669 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:45,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:45,670 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:45,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Waiting until timeout for monitored process [2021-11-23 16:55:45,757 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 16:55:45,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:45,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:55:45,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:46,170 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-23 16:55:46,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:46,901 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-23 16:55:46,901 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:46,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [557019401] [2021-11-23 16:55:46,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [557019401] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:46,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1456496435] [2021-11-23 16:55:46,901 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:55:46,901 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:46,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:46,902 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:46,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Waiting until timeout for monitored process [2021-11-23 16:55:47,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 16:55:47,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:47,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:55:47,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:47,167 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-23 16:55:47,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:47,271 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-23 16:55:47,271 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1456496435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:47,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921358171] [2021-11-23 16:55:47,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:55:47,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:47,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:47,273 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:47,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2021-11-23 16:55:47,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 16:55:47,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:47,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 16:55:47,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:47,456 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-23 16:55:47,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:47,582 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-11-23 16:55:47,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921358171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:47,582 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:47,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21, 21] total 40 [2021-11-23 16:55:47,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866949369] [2021-11-23 16:55:47,583 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:47,583 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 16:55:47,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:47,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 16:55:47,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=340, Invalid=1220, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 16:55:47,585 INFO L87 Difference]: Start difference. First operand 394 states and 483 transitions. Second operand has 40 states, 40 states have (on average 1.175) internal successors, (47), 40 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:52,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:52,182 INFO L93 Difference]: Finished difference Result 595 states and 722 transitions. [2021-11-23 16:55:52,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-23 16:55:52,182 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.175) internal successors, (47), 40 states have internal predecessors, (47), 0 states have call successors, (0), 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 47 [2021-11-23 16:55:52,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:52,185 INFO L225 Difference]: With dead ends: 595 [2021-11-23 16:55:52,185 INFO L226 Difference]: Without dead ends: 548 [2021-11-23 16:55:52,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 239 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3799 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2667, Invalid=13335, Unknown=0, NotChecked=0, Total=16002 [2021-11-23 16:55:52,187 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 313 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 568 mSolverCounterSat, 851 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 313 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 1419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 851 IncrementalHoareTripleChecker+Valid, 568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:52,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [313 Valid, 102 Invalid, 1419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [851 Valid, 568 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 16:55:52,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-11-23 16:55:52,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 269. [2021-11-23 16:55:52,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.1604477611940298) internal successors, (311), 268 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:52,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 311 transitions. [2021-11-23 16:55:52,309 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 311 transitions. Word has length 47 [2021-11-23 16:55:52,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:52,310 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 311 transitions. [2021-11-23 16:55:52,310 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.175) internal successors, (47), 40 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:55:52,310 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 311 transitions. [2021-11-23 16:55:52,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 16:55:52,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:52,311 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:52,383 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2021-11-23 16:55:52,538 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (105)] Ended with exit code 0 [2021-11-23 16:55:52,733 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (106)] Ended with exit code 0 [2021-11-23 16:55:52,931 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:52,932 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:52,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:52,932 INFO L85 PathProgramCache]: Analyzing trace with hash 166365503, now seen corresponding path program 34 times [2021-11-23 16:55:52,933 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:52,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1678632642] [2021-11-23 16:55:52,933 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:55:52,933 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:52,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:52,934 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:52,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Waiting until timeout for monitored process [2021-11-23 16:55:53,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:55:53,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:53,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:55:53,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:53,242 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:53,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:53,331 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:53,331 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:53,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1678632642] [2021-11-23 16:55:53,331 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1678632642] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:53,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [236491772] [2021-11-23 16:55:53,331 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:55:53,331 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:53,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:53,332 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:53,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Waiting until timeout for monitored process [2021-11-23 16:55:53,518 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:55:53,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:53,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:55:53,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:53,611 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:53,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:53,687 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:53,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [236491772] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:53,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366504076] [2021-11-23 16:55:53,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:55:53,688 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:53,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:53,688 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:53,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2021-11-23 16:55:53,752 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:55:53,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:53,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-23 16:55:53,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:53,854 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:53,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:53,935 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:53,935 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366504076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:53,936 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:53,936 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17, 17] total 18 [2021-11-23 16:55:53,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002489891] [2021-11-23 16:55:53,936 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:53,936 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 16:55:53,936 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:53,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 16:55:53,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-11-23 16:55:53,937 INFO L87 Difference]: Start difference. First operand 269 states and 311 transitions. Second operand has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 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 16:55:54,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:55:54,366 INFO L93 Difference]: Finished difference Result 324 states and 367 transitions. [2021-11-23 16:55:54,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 16:55:54,366 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 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 48 [2021-11-23 16:55:54,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:55:54,368 INFO L225 Difference]: With dead ends: 324 [2021-11-23 16:55:54,368 INFO L226 Difference]: Without dead ends: 306 [2021-11-23 16:55:54,368 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 263 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:55:54,368 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 17 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 564 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:55:54,369 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 310 Invalid, 564 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 564 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:55:54,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2021-11-23 16:55:54,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 281. [2021-11-23 16:55:54,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 281 states, 280 states have (on average 1.1571428571428573) internal successors, (324), 280 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 16:55:54,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 324 transitions. [2021-11-23 16:55:54,499 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 324 transitions. Word has length 48 [2021-11-23 16:55:54,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:55:54,500 INFO L470 AbstractCegarLoop]: Abstraction has 281 states and 324 transitions. [2021-11-23 16:55:54,500 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.111111111111111) internal successors, (38), 18 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 16:55:54,500 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 324 transitions. [2021-11-23 16:55:54,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-23 16:55:54,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:55:54,501 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:55:54,508 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (109)] Ended with exit code 0 [2021-11-23 16:55:54,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (108)] Forceful destruction successful, exit code 0 [2021-11-23 16:55:54,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2021-11-23 16:55:55,103 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:55,104 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:55:55,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:55:55,104 INFO L85 PathProgramCache]: Analyzing trace with hash -747876349, now seen corresponding path program 35 times [2021-11-23 16:55:55,104 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:55:55,104 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [844541927] [2021-11-23 16:55:55,104 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:55:55,104 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:55:55,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:55:55,105 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:55:55,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Waiting until timeout for monitored process [2021-11-23 16:55:55,192 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-23 16:55:55,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:55,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:55:55,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:55,626 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:55,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:55,724 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:55,724 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:55:55,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [844541927] [2021-11-23 16:55:55,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [844541927] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:55,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [868964863] [2021-11-23 16:55:55,725 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:55:55,725 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:55:55,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:55:55,727 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:55:55,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Waiting until timeout for monitored process [2021-11-23 16:55:55,939 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-23 16:55:55,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:55,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 16:55:55,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:56,041 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:56,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:56,172 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:56,172 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [868964863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:56,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202498754] [2021-11-23 16:55:56,172 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:55:56,172 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:55:56,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:55:56,173 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:55:56,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2021-11-23 16:55:56,265 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-23 16:55:56,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:55:56,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 16:55:56,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:55:56,375 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:56,375 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:55:57,348 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 16:55:57,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202498754] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:55:57,349 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:55:57,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 31, 31] total 60 [2021-11-23 16:55:57,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105058352] [2021-11-23 16:55:57,349 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:55:57,349 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-23 16:55:57,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:55:57,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-23 16:55:57,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=511, Invalid=3029, Unknown=0, NotChecked=0, Total=3540 [2021-11-23 16:55:57,351 INFO L87 Difference]: Start difference. First operand 281 states and 324 transitions. Second operand has 60 states, 60 states have (on average 1.1666666666666667) internal successors, (70), 60 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:22,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:22,146 INFO L93 Difference]: Finished difference Result 798 states and 928 transitions. [2021-11-23 16:56:22,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 359 states. [2021-11-23 16:56:22,146 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.1666666666666667) internal successors, (70), 60 states have internal predecessors, (70), 0 states have call successors, (0), 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 49 [2021-11-23 16:56:22,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:22,149 INFO L225 Difference]: With dead ends: 798 [2021-11-23 16:56:22,149 INFO L226 Difference]: Without dead ends: 716 [2021-11-23 16:56:22,158 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 629 GetRequests, 228 SyntacticMatches, 2 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58812 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=18197, Invalid=142203, Unknown=0, NotChecked=0, Total=160400 [2021-11-23 16:56:22,158 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 570 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 1044 mSolverCounterSat, 2880 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 570 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 3924 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2880 IncrementalHoareTripleChecker+Valid, 1044 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:22,158 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [570 Valid, 235 Invalid, 3924 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2880 Valid, 1044 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 16:56:22,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-11-23 16:56:22,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 285. [2021-11-23 16:56:22,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.1725352112676057) internal successors, (333), 284 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:22,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 333 transitions. [2021-11-23 16:56:22,263 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 333 transitions. Word has length 49 [2021-11-23 16:56:22,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:22,263 INFO L470 AbstractCegarLoop]: Abstraction has 285 states and 333 transitions. [2021-11-23 16:56:22,263 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.1666666666666667) internal successors, (70), 60 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:22,263 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 333 transitions. [2021-11-23 16:56:22,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 16:56:22,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:22,265 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:22,288 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2021-11-23 16:56:22,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (111)] Ended with exit code 0 [2021-11-23 16:56:22,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (112)] Forceful destruction successful, exit code 0 [2021-11-23 16:56:22,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:22,872 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:22,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:22,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1672367285, now seen corresponding path program 36 times [2021-11-23 16:56:22,872 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:22,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1761552529] [2021-11-23 16:56:22,873 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:56:22,873 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:22,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:22,874 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:22,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Waiting until timeout for monitored process [2021-11-23 16:56:22,995 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 16:56:22,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:56:23,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:56:23,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:23,250 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:56:23,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:23,378 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:56:23,378 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:23,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1761552529] [2021-11-23 16:56:23,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1761552529] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:23,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [397281128] [2021-11-23 16:56:23,379 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:56:23,379 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:23,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:23,384 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:23,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Waiting until timeout for monitored process [2021-11-23 16:56:23,709 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 16:56:23,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:56:23,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:56:23,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:23,832 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:56:23,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:23,923 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:56:23,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [397281128] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:23,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594266230] [2021-11-23 16:56:23,924 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 16:56:23,924 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:23,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:23,925 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:23,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2021-11-23 16:56:24,014 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-23 16:56:24,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:56:24,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:56:24,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:24,216 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:56:24,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:24,310 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:56:24,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594266230] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:24,311 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:24,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18, 18] total 19 [2021-11-23 16:56:24,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685365565] [2021-11-23 16:56:24,311 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:24,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 16:56:24,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:24,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 16:56:24,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-11-23 16:56:24,312 INFO L87 Difference]: Start difference. First operand 285 states and 333 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:24,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:56:24,744 INFO L93 Difference]: Finished difference Result 346 states and 395 transitions. [2021-11-23 16:56:24,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 16:56:24,744 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-23 16:56:24,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:56:24,746 INFO L225 Difference]: With dead ends: 346 [2021-11-23 16:56:24,746 INFO L226 Difference]: Without dead ends: 327 [2021-11-23 16:56:24,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 280 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=339, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:56:24,747 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 22 mSDsluCounter, 369 mSDsCounter, 0 mSdLazyCounter, 652 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 652 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:56:24,747 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 395 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 652 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:56:24,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-23 16:56:24,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 297. [2021-11-23 16:56:24,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.1689189189189189) internal successors, (346), 296 states have internal predecessors, (346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:24,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 346 transitions. [2021-11-23 16:56:24,866 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 346 transitions. Word has length 51 [2021-11-23 16:56:24,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:56:24,866 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 346 transitions. [2021-11-23 16:56:24,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 19 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:56:24,867 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 346 transitions. [2021-11-23 16:56:24,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 16:56:24,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:56:24,868 INFO L514 BasicCegarLoop]: trace histogram [23, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:56:24,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (115)] Ended with exit code 0 [2021-11-23 16:56:25,091 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2021-11-23 16:56:25,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (114)] Ended with exit code 0 [2021-11-23 16:56:25,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 16:56:25,471 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:56:25,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:56:25,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1208236852, now seen corresponding path program 37 times [2021-11-23 16:56:25,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:56:25,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [655594266] [2021-11-23 16:56:25,472 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:56:25,472 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:56:25,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:56:25,473 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:56:25,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Waiting until timeout for monitored process [2021-11-23 16:56:25,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:25,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:56:25,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:26,151 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:56:26,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:27,492 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:56:27,492 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:56:27,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [655594266] [2021-11-23 16:56:27,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [655594266] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:27,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1603755948] [2021-11-23 16:56:27,492 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:56:27,493 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:56:27,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:56:27,493 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:56:27,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Waiting until timeout for monitored process [2021-11-23 16:56:27,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:27,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:56:27,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:27,787 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:56:27,787 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:27,877 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 321 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:56:27,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1603755948] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:27,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [298033768] [2021-11-23 16:56:27,877 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 16:56:27,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:56:27,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:56:27,878 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:56:27,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2021-11-23 16:56:27,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 16:56:27,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:56:27,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:56:28,044 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 331 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:56:28,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:56:28,179 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 331 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 16:56:28,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [298033768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:56:28,179 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:56:28,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 26, 26] total 71 [2021-11-23 16:56:28,179 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139070783] [2021-11-23 16:56:28,179 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:56:28,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-23 16:56:28,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:56:28,180 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-23 16:56:28,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=828, Invalid=4142, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 16:56:28,181 INFO L87 Difference]: Start difference. First operand 297 states and 346 transitions. Second operand has 71 states, 71 states have (on average 1.5352112676056338) internal successors, (109), 71 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:04,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:04,817 INFO L93 Difference]: Finished difference Result 2096 states and 2479 transitions. [2021-11-23 16:58:04,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 649 states. [2021-11-23 16:58:04,818 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.5352112676056338) internal successors, (109), 71 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-23 16:58:04,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:04,825 INFO L225 Difference]: With dead ends: 2096 [2021-11-23 16:58:04,825 INFO L226 Difference]: Without dead ends: 2081 [2021-11-23 16:58:04,842 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 922 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 691 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213252 ImplicationChecksByTransitivity, 92.5s TimeCoverageRelationStatistics Valid=92308, Invalid=387248, Unknown=0, NotChecked=0, Total=479556 [2021-11-23 16:58:04,843 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 1739 mSDsluCounter, 677 mSDsCounter, 0 mSdLazyCounter, 3572 mSolverCounterSat, 7542 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1739 SdHoareTripleChecker+Valid, 702 SdHoareTripleChecker+Invalid, 11114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7542 IncrementalHoareTripleChecker+Valid, 3572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:04,843 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1739 Valid, 702 Invalid, 11114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7542 Valid, 3572 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2021-11-23 16:58:04,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2081 states. [2021-11-23 16:58:05,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2081 to 441. [2021-11-23 16:58:05,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 1.1977272727272728) internal successors, (527), 440 states have internal predecessors, (527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:05,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 527 transitions. [2021-11-23 16:58:05,091 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 527 transitions. Word has length 51 [2021-11-23 16:58:05,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:05,092 INFO L470 AbstractCegarLoop]: Abstraction has 441 states and 527 transitions. [2021-11-23 16:58:05,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.5352112676056338) internal successors, (109), 71 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:05,092 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 527 transitions. [2021-11-23 16:58:05,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 16:58:05,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:05,094 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:05,109 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (118)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:05,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (117)] Ended with exit code 0 [2021-11-23 16:58:05,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2021-11-23 16:58:05,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:05,696 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:05,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:05,697 INFO L85 PathProgramCache]: Analyzing trace with hash 1875994959, now seen corresponding path program 38 times [2021-11-23 16:58:05,697 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:05,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [733888395] [2021-11-23 16:58:05,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:58:05,697 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:05,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:05,698 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:05,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Waiting until timeout for monitored process [2021-11-23 16:58:05,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:58:05,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:05,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:58:05,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:06,318 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:58:06,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:07,401 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:58:07,401 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:07,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [733888395] [2021-11-23 16:58:07,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [733888395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:07,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [788823601] [2021-11-23 16:58:07,401 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:58:07,401 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:07,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:07,402 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:07,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (121)] Waiting until timeout for monitored process [2021-11-23 16:58:07,617 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:58:07,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:07,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:58:07,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:07,707 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:58:07,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:07,793 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:58:07,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [788823601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:07,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624810808] [2021-11-23 16:58:07,794 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 16:58:07,794 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:07,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:07,795 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:07,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2021-11-23 16:58:07,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 16:58:07,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:07,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-23 16:58:07,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:07,974 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:58:07,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:08,080 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 16:58:08,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624810808] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:08,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:08,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33, 33] total 64 [2021-11-23 16:58:08,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87597233] [2021-11-23 16:58:08,081 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:08,081 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-23 16:58:08,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:08,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-23 16:58:08,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=3455, Unknown=0, NotChecked=0, Total=4032 [2021-11-23 16:58:08,083 INFO L87 Difference]: Start difference. First operand 441 states and 527 transitions. Second operand has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:41,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:41,995 INFO L93 Difference]: Finished difference Result 874 states and 1007 transitions. [2021-11-23 16:58:42,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 407 states. [2021-11-23 16:58:42,001 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 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 52 [2021-11-23 16:58:42,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:42,004 INFO L225 Difference]: With dead ends: 874 [2021-11-23 16:58:42,004 INFO L226 Difference]: Without dead ends: 786 [2021-11-23 16:58:42,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 694 GetRequests, 244 SyntacticMatches, 0 SemanticMatches, 450 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75924 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=22856, Invalid=180996, Unknown=0, NotChecked=0, Total=203852 [2021-11-23 16:58:42,019 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 589 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 1266 mSolverCounterSat, 3048 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 589 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 4314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3048 IncrementalHoareTripleChecker+Valid, 1266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:42,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [589 Valid, 240 Invalid, 4314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3048 Valid, 1266 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-23 16:58:42,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 786 states. [2021-11-23 16:58:42,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 786 to 455. [2021-11-23 16:58:42,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 454 states have (on average 1.198237885462555) internal successors, (544), 454 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:42,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 544 transitions. [2021-11-23 16:58:42,244 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 544 transitions. Word has length 52 [2021-11-23 16:58:42,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:42,245 INFO L470 AbstractCegarLoop]: Abstraction has 455 states and 544 transitions. [2021-11-23 16:58:42,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.125) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:42,245 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 544 transitions. [2021-11-23 16:58:42,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 16:58:42,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:42,247 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:42,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (120)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:42,480 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2021-11-23 16:58:42,661 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (121)] Ended with exit code 0 [2021-11-23 16:58:42,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:42,860 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:42,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:42,860 INFO L85 PathProgramCache]: Analyzing trace with hash 1354813695, now seen corresponding path program 39 times [2021-11-23 16:58:42,861 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:42,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [207557317] [2021-11-23 16:58:42,861 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:58:42,861 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:42,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:42,862 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:42,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Waiting until timeout for monitored process [2021-11-23 16:58:43,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-23 16:58:43,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:43,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:58:43,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:43,312 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:43,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:43,415 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:43,415 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:43,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [207557317] [2021-11-23 16:58:43,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [207557317] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:43,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2103435831] [2021-11-23 16:58:43,415 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:58:43,415 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:43,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:43,416 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:43,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Waiting until timeout for monitored process [2021-11-23 16:58:43,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-23 16:58:43,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:43,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:58:43,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:43,780 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:43,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:43,878 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:43,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2103435831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:43,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601445112] [2021-11-23 16:58:43,878 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 16:58:43,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:43,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:43,879 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:43,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2021-11-23 16:58:44,099 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-23 16:58:44,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:44,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 16:58:44,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:44,219 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:44,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:44,311 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:44,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601445112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:44,311 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:44,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19, 19] total 20 [2021-11-23 16:58:44,311 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027919307] [2021-11-23 16:58:44,311 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:44,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 16:58:44,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:44,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 16:58:44,313 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-11-23 16:58:44,313 INFO L87 Difference]: Start difference. First operand 455 states and 544 transitions. Second operand has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 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 16:58:44,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:58:44,927 INFO L93 Difference]: Finished difference Result 555 states and 647 transitions. [2021-11-23 16:58:44,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 16:58:44,927 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 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 54 [2021-11-23 16:58:44,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:58:44,929 INFO L225 Difference]: With dead ends: 555 [2021-11-23 16:58:44,929 INFO L226 Difference]: Without dead ends: 535 [2021-11-23 16:58:44,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 297 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=377, Unknown=0, NotChecked=0, Total=420 [2021-11-23 16:58:44,930 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 27 mSDsluCounter, 434 mSDsCounter, 0 mSdLazyCounter, 702 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:58:44,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 464 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 702 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 16:58:44,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-11-23 16:58:45,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 469. [2021-11-23 16:58:45,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 1.1965811965811965) internal successors, (560), 468 states have internal predecessors, (560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:58:45,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 560 transitions. [2021-11-23 16:58:45,190 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 560 transitions. Word has length 54 [2021-11-23 16:58:45,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:58:45,191 INFO L470 AbstractCegarLoop]: Abstraction has 469 states and 560 transitions. [2021-11-23 16:58:45,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 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 16:58:45,191 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 560 transitions. [2021-11-23 16:58:45,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-23 16:58:45,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:58:45,192 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:58:45,198 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (124)] Ended with exit code 0 [2021-11-23 16:58:45,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (123)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:45,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Forceful destruction successful, exit code 0 [2021-11-23 16:58:45,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:45,796 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:58:45,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:58:45,796 INFO L85 PathProgramCache]: Analyzing trace with hash 493666435, now seen corresponding path program 40 times [2021-11-23 16:58:45,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:58:45,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1533005673] [2021-11-23 16:58:45,796 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:58:45,797 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:58:45,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:58:45,797 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:58:45,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Waiting until timeout for monitored process [2021-11-23 16:58:45,914 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:58:45,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:45,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:58:45,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:46,472 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:46,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:46,589 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:46,589 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:58:46,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1533005673] [2021-11-23 16:58:46,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1533005673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:46,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1117789899] [2021-11-23 16:58:46,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:58:46,589 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:58:46,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:58:46,590 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:58:46,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Waiting until timeout for monitored process [2021-11-23 16:58:46,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:58:46,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:46,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 16:58:46,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:46,964 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:46,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:47,087 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:47,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1117789899] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:47,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904026005] [2021-11-23 16:58:47,087 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 16:58:47,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:58:47,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:58:47,091 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:58:47,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2021-11-23 16:58:47,154 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 16:58:47,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:58:47,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 16:58:47,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:58:47,292 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:47,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:58:48,632 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 16:58:48,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904026005] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:58:48,632 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:58:48,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 35, 35] total 68 [2021-11-23 16:58:48,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496631285] [2021-11-23 16:58:48,633 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:58:48,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-23 16:58:48,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:58:48,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-23 16:58:48,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=3909, Unknown=0, NotChecked=0, Total=4556 [2021-11-23 16:58:48,634 INFO L87 Difference]: Start difference. First operand 469 states and 560 transitions. Second operand has 68 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 68 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:32,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 16:59:32,647 INFO L93 Difference]: Finished difference Result 1018 states and 1179 transitions. [2021-11-23 16:59:32,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 458 states. [2021-11-23 16:59:32,648 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 68 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-23 16:59:32,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 16:59:32,651 INFO L225 Difference]: With dead ends: 1018 [2021-11-23 16:59:32,651 INFO L226 Difference]: Without dead ends: 915 [2021-11-23 16:59:32,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 762 GetRequests, 256 SyntacticMatches, 2 SemanticMatches, 504 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97095 ImplicationChecksByTransitivity, 42.8s TimeCoverageRelationStatistics Valid=28351, Invalid=227179, Unknown=0, NotChecked=0, Total=255530 [2021-11-23 16:59:32,664 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 636 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 1283 mSolverCounterSat, 3205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 636 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 4488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3205 IncrementalHoareTripleChecker+Valid, 1283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 16:59:32,664 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [636 Valid, 259 Invalid, 4488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3205 Valid, 1283 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 16:59:32,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 915 states. [2021-11-23 16:59:32,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 915 to 472. [2021-11-23 16:59:32,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 1.2038216560509554) internal successors, (567), 471 states have internal predecessors, (567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:32,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 567 transitions. [2021-11-23 16:59:32,968 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 567 transitions. Word has length 55 [2021-11-23 16:59:32,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 16:59:32,968 INFO L470 AbstractCegarLoop]: Abstraction has 472 states and 567 transitions. [2021-11-23 16:59:32,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.1470588235294117) internal successors, (78), 68 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 16:59:32,969 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 567 transitions. [2021-11-23 16:59:32,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 16:59:32,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 16:59:32,970 INFO L514 BasicCegarLoop]: trace histogram [26, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 16:59:32,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (126)] Forceful destruction successful, exit code 0 [2021-11-23 16:59:33,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Ended with exit code 0 [2021-11-23 16:59:33,385 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (127)] Ended with exit code 0 [2021-11-23 16:59:33,583 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:33,584 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 16:59:33,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 16:59:33,584 INFO L85 PathProgramCache]: Analyzing trace with hash -1284663330, now seen corresponding path program 41 times [2021-11-23 16:59:33,584 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 16:59:33,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [588375012] [2021-11-23 16:59:33,585 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:59:33,585 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 16:59:33,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 16:59:33,586 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 16:59:33,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Waiting until timeout for monitored process [2021-11-23 16:59:33,697 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-11-23 16:59:33,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:59:33,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 16:59:33,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:34,143 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 417 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:59:34,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:35,127 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 417 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:59:35,127 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 16:59:35,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [588375012] [2021-11-23 16:59:35,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [588375012] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:35,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [472501358] [2021-11-23 16:59:35,128 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:59:35,128 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 16:59:35,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 16:59:35,129 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 16:59:35,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Waiting until timeout for monitored process [2021-11-23 16:59:35,397 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-11-23 16:59:35,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:59:35,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 16:59:35,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:35,519 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 417 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:59:35,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:35,620 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 417 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:59:35,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [472501358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:35,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923392790] [2021-11-23 16:59:35,621 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-23 16:59:35,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 16:59:35,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 16:59:35,622 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 16:59:35,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2021-11-23 16:59:35,752 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-11-23 16:59:35,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 16:59:35,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 16:59:35,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 16:59:35,872 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 417 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:59:35,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 16:59:35,980 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 0 proven. 417 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 16:59:35,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [923392790] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 16:59:35,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 16:59:35,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29, 29] total 56 [2021-11-23 16:59:35,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924082398] [2021-11-23 16:59:35,981 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 16:59:35,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 16:59:35,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 16:59:35,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 16:59:35,982 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=2254, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 16:59:35,983 INFO L87 Difference]: Start difference. First operand 472 states and 567 transitions. Second operand has 56 states, 56 states have (on average 1.6071428571428572) internal successors, (90), 56 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:00,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:00,110 INFO L93 Difference]: Finished difference Result 2247 states and 2589 transitions. [2021-11-23 17:00:00,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 236 states. [2021-11-23 17:00:00,111 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.6071428571428572) internal successors, (90), 56 states have internal predecessors, (90), 0 states have call successors, (0), 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 56 [2021-11-23 17:00:00,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:00,118 INFO L225 Difference]: With dead ends: 2247 [2021-11-23 17:00:00,119 INFO L226 Difference]: Without dead ends: 2242 [2021-11-23 17:00:00,125 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 535 GetRequests, 276 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20881 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=16496, Invalid=51364, Unknown=0, NotChecked=0, Total=67860 [2021-11-23 17:00:00,126 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 1908 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 1537 mSolverCounterSat, 1919 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1908 SdHoareTripleChecker+Valid, 1032 SdHoareTripleChecker+Invalid, 3456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1919 IncrementalHoareTripleChecker+Valid, 1537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:00,126 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1908 Valid, 1032 Invalid, 3456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1919 Valid, 1537 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-23 17:00:00,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2242 states. [2021-11-23 17:00:00,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2242 to 590. [2021-11-23 17:00:00,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 590 states, 589 states have (on average 1.202037351443124) internal successors, (708), 589 states have internal predecessors, (708), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:00,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 590 states to 590 states and 708 transitions. [2021-11-23 17:00:00,530 INFO L78 Accepts]: Start accepts. Automaton has 590 states and 708 transitions. Word has length 56 [2021-11-23 17:00:00,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:00,530 INFO L470 AbstractCegarLoop]: Abstraction has 590 states and 708 transitions. [2021-11-23 17:00:00,530 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.6071428571428572) internal successors, (90), 56 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:00,530 INFO L276 IsEmpty]: Start isEmpty. Operand 590 states and 708 transitions. [2021-11-23 17:00:00,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 17:00:00,532 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:00,532 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:00,560 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (129)] Ended with exit code 0 [2021-11-23 17:00:00,746 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (130)] Ended with exit code 0 [2021-11-23 17:00:00,968 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Ended with exit code 0 [2021-11-23 17:00:01,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:01,147 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:01,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:01,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1845587061, now seen corresponding path program 42 times [2021-11-23 17:00:01,147 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:01,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [608072702] [2021-11-23 17:00:01,147 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:00:01,148 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:01,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:01,148 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:01,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Waiting until timeout for monitored process [2021-11-23 17:00:01,288 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-23 17:00:01,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:00:01,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:00:01,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:01,555 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:01,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:01,719 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:01,719 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:01,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [608072702] [2021-11-23 17:00:01,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [608072702] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:01,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1802767748] [2021-11-23 17:00:01,719 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:00:01,719 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:01,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:01,721 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:01,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Waiting until timeout for monitored process [2021-11-23 17:00:02,028 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-23 17:00:02,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:00:02,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:00:02,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:02,152 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:02,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:02,245 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:02,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1802767748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:02,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1267804776] [2021-11-23 17:00:02,246 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-23 17:00:02,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:02,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:02,247 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:02,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2021-11-23 17:00:02,348 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-11-23 17:00:02,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:00:02,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-23 17:00:02,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:02,470 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:02,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:02,563 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:02,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1267804776] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:02,563 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:02,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20, 20] total 21 [2021-11-23 17:00:02,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097223981] [2021-11-23 17:00:02,564 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:02,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2021-11-23 17:00:02,564 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:02,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-11-23 17:00:02,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-11-23 17:00:02,565 INFO L87 Difference]: Start difference. First operand 590 states and 708 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:03,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:03,270 INFO L93 Difference]: Finished difference Result 762 states and 886 transitions. [2021-11-23 17:00:03,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 17:00:03,270 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 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 57 [2021-11-23 17:00:03,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:03,273 INFO L225 Difference]: With dead ends: 762 [2021-11-23 17:00:03,273 INFO L226 Difference]: Without dead ends: 741 [2021-11-23 17:00:03,273 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 314 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=417, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:00:03,274 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 32 mSDsluCounter, 555 mSDsCounter, 0 mSdLazyCounter, 846 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 846 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 846 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:03,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 589 Invalid, 846 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 846 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 17:00:03,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2021-11-23 17:00:03,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 616. [2021-11-23 17:00:03,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 616 states, 615 states have (on average 1.1983739837398375) internal successors, (737), 615 states have internal predecessors, (737), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:03,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 616 states to 616 states and 737 transitions. [2021-11-23 17:00:03,605 INFO L78 Accepts]: Start accepts. Automaton has 616 states and 737 transitions. Word has length 57 [2021-11-23 17:00:03,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:03,605 INFO L470 AbstractCegarLoop]: Abstraction has 616 states and 737 transitions. [2021-11-23 17:00:03,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:03,605 INFO L276 IsEmpty]: Start isEmpty. Operand 616 states and 737 transitions. [2021-11-23 17:00:03,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 17:00:03,606 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:03,606 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:03,608 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (133)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:03,814 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (132)] Ended with exit code 0 [2021-11-23 17:00:04,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:04,207 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:04,207 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:04,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:04,207 INFO L85 PathProgramCache]: Analyzing trace with hash -1148417713, now seen corresponding path program 43 times [2021-11-23 17:00:04,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:04,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1295472676] [2021-11-23 17:00:04,207 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:00:04,207 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:04,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:04,208 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:04,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Waiting until timeout for monitored process [2021-11-23 17:00:04,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:04,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:00:04,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:04,964 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:04,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:05,084 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:05,084 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:05,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1295472676] [2021-11-23 17:00:05,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1295472676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:05,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1163939194] [2021-11-23 17:00:05,084 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:00:05,084 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:05,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:05,085 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:05,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (136)] Waiting until timeout for monitored process [2021-11-23 17:00:05,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:05,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 17:00:05,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:05,422 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:05,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:05,542 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:05,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1163939194] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:05,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608294369] [2021-11-23 17:00:05,543 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 17:00:05,543 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:05,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:05,543 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:00:05,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2021-11-23 17:00:05,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 17:00:05,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-23 17:00:05,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:05,745 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:05,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:07,094 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-23 17:00:07,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608294369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:07,095 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:00:07,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 37, 37] total 72 [2021-11-23 17:00:07,095 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691588967] [2021-11-23 17:00:07,095 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:00:07,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 17:00:07,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:00:07,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 17:00:07,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=721, Invalid=4391, Unknown=0, NotChecked=0, Total=5112 [2021-11-23 17:00:07,096 INFO L87 Difference]: Start difference. First operand 616 states and 737 transitions. Second operand has 72 states, 72 states have (on average 1.1388888888888888) internal successors, (82), 72 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 17:00:55,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:00:55,772 INFO L93 Difference]: Finished difference Result 1228 states and 1422 transitions. [2021-11-23 17:00:55,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 512 states. [2021-11-23 17:00:55,772 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.1388888888888888) internal successors, (82), 72 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 58 [2021-11-23 17:00:55,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:00:55,776 INFO L225 Difference]: With dead ends: 1228 [2021-11-23 17:00:55,776 INFO L226 Difference]: Without dead ends: 1112 [2021-11-23 17:00:55,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 833 GetRequests, 270 SyntacticMatches, 2 SemanticMatches, 561 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122339 ImplicationChecksByTransitivity, 47.2s TimeCoverageRelationStatistics Valid=34776, Invalid=281630, Unknown=0, NotChecked=0, Total=316406 [2021-11-23 17:00:55,794 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 860 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 1641 mSolverCounterSat, 4280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 860 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 5921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4280 IncrementalHoareTripleChecker+Valid, 1641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:00:55,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [860 Valid, 303 Invalid, 5921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4280 Valid, 1641 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 17:00:55,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1112 states. [2021-11-23 17:00:56,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1112 to 635. [2021-11-23 17:00:56,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 634 states have (on average 1.2003154574132493) internal successors, (761), 634 states have internal predecessors, (761), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:00:56,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 761 transitions. [2021-11-23 17:00:56,256 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 761 transitions. Word has length 58 [2021-11-23 17:00:56,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:00:56,256 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 761 transitions. [2021-11-23 17:00:56,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.1388888888888888) internal successors, (82), 72 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 17:00:56,256 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 761 transitions. [2021-11-23 17:00:56,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-23 17:00:56,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:00:56,257 INFO L514 BasicCegarLoop]: trace histogram [27, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:00:56,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (136)] Ended with exit code 0 [2021-11-23 17:00:56,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (135)] Forceful destruction successful, exit code 0 [2021-11-23 17:00:56,680 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2021-11-23 17:00:56,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:56,860 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:00:56,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:00:56,860 INFO L85 PathProgramCache]: Analyzing trace with hash -1808236848, now seen corresponding path program 44 times [2021-11-23 17:00:56,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:00:56,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1404802722] [2021-11-23 17:00:56,861 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:00:56,861 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:00:56,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:00:56,861 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:00:56,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (138)] Waiting until timeout for monitored process [2021-11-23 17:00:56,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:00:56,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:00:56,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:00:56,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:57,729 INFO L134 CoverageAnalysis]: Checked inductivity of 511 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:00:57,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:59,553 INFO L134 CoverageAnalysis]: Checked inductivity of 511 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:00:59,553 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:00:59,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1404802722] [2021-11-23 17:00:59,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1404802722] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:59,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [601294036] [2021-11-23 17:00:59,553 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:00:59,553 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:00:59,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:00:59,554 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:00:59,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (139)] Waiting until timeout for monitored process [2021-11-23 17:00:59,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:00:59,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:00:59,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:00:59,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:00:59,859 INFO L134 CoverageAnalysis]: Checked inductivity of 511 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:00:59,859 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:00:59,983 INFO L134 CoverageAnalysis]: Checked inductivity of 511 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:00:59,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [601294036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:00:59,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940348927] [2021-11-23 17:00:59,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 17:00:59,984 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:00:59,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:00:59,985 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:01:00,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2021-11-23 17:01:00,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 17:01:00,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:01:00,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-23 17:01:00,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:01:00,171 INFO L134 CoverageAnalysis]: Checked inductivity of 511 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:01:00,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:01:00,300 INFO L134 CoverageAnalysis]: Checked inductivity of 511 backedges. 0 proven. 433 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:01:00,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940348927] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:01:00,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:01:00,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41, 41] total 80 [2021-11-23 17:01:00,304 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335090211] [2021-11-23 17:01:00,305 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:01:00,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2021-11-23 17:01:00,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:01:00,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2021-11-23 17:01:00,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1051, Invalid=5269, Unknown=0, NotChecked=0, Total=6320 [2021-11-23 17:01:00,307 INFO L87 Difference]: Start difference. First operand 635 states and 761 transitions. Second operand has 80 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:20,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:20,324 INFO L93 Difference]: Finished difference Result 2385 states and 2754 transitions. [2021-11-23 17:03:20,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 796 states. [2021-11-23 17:03:20,325 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 0 states have call successors, (0), 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 58 [2021-11-23 17:03:20,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:20,333 INFO L225 Difference]: With dead ends: 2385 [2021-11-23 17:03:20,333 INFO L226 Difference]: Without dead ends: 2330 [2021-11-23 17:03:20,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1107 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 843 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322783 ImplicationChecksByTransitivity, 134.0s TimeCoverageRelationStatistics Valid=136484, Invalid=576696, Unknown=0, NotChecked=0, Total=713180 [2021-11-23 17:03:20,361 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 2124 mSDsluCounter, 916 mSDsCounter, 0 mSdLazyCounter, 5175 mSolverCounterSat, 11047 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2124 SdHoareTripleChecker+Valid, 943 SdHoareTripleChecker+Invalid, 16222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11047 IncrementalHoareTripleChecker+Valid, 5175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:20,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2124 Valid, 943 Invalid, 16222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11047 Valid, 5175 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 17:03:20,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2330 states. [2021-11-23 17:03:20,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2330 to 589. [2021-11-23 17:03:20,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 589 states, 588 states have (on average 1.1904761904761905) internal successors, (700), 588 states have internal predecessors, (700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:20,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 589 states to 589 states and 700 transitions. [2021-11-23 17:03:20,758 INFO L78 Accepts]: Start accepts. Automaton has 589 states and 700 transitions. Word has length 58 [2021-11-23 17:03:20,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:20,758 INFO L470 AbstractCegarLoop]: Abstraction has 589 states and 700 transitions. [2021-11-23 17:03:20,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:20,758 INFO L276 IsEmpty]: Start isEmpty. Operand 589 states and 700 transitions. [2021-11-23 17:03:20,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:03:20,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:20,759 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:20,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:20,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (139)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:21,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (138)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:21,361 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 [2021-11-23 17:03:21,362 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:21,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:21,362 INFO L85 PathProgramCache]: Analyzing trace with hash -2142156609, now seen corresponding path program 45 times [2021-11-23 17:03:21,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:21,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [992315769] [2021-11-23 17:03:21,363 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:03:21,363 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:21,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:21,364 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:21,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (141)] Waiting until timeout for monitored process [2021-11-23 17:03:21,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 17:03:21,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:21,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:03:21,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:21,833 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-23 17:03:21,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:21,967 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-23 17:03:21,967 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:21,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [992315769] [2021-11-23 17:03:21,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [992315769] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:21,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [213453771] [2021-11-23 17:03:21,968 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:03:21,968 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:21,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:21,968 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:21,969 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (142)] Waiting until timeout for monitored process [2021-11-23 17:03:22,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 17:03:22,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:22,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 17:03:22,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:22,347 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-23 17:03:22,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:22,441 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-23 17:03:22,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [213453771] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:22,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456632461] [2021-11-23 17:03:22,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 17:03:22,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:22,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:22,443 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:22,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2021-11-23 17:03:22,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-23 17:03:22,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:22,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-23 17:03:22,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:22,667 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-23 17:03:22,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:22,788 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-23 17:03:22,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456632461] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:22,789 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:22,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21, 21] total 22 [2021-11-23 17:03:22,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217490420] [2021-11-23 17:03:22,789 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:22,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 17:03:22,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:22,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 17:03:22,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-11-23 17:03:22,790 INFO L87 Difference]: Start difference. First operand 589 states and 700 transitions. Second operand has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:23,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 17:03:23,730 INFO L93 Difference]: Finished difference Result 715 states and 830 transitions. [2021-11-23 17:03:23,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 17:03:23,730 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 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 17:03:23,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 17:03:23,733 INFO L225 Difference]: With dead ends: 715 [2021-11-23 17:03:23,733 INFO L226 Difference]: Without dead ends: 693 [2021-11-23 17:03:23,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=459, Unknown=0, NotChecked=0, Total=506 [2021-11-23 17:03:23,734 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 37 mSDsluCounter, 630 mSDsCounter, 0 mSdLazyCounter, 900 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 668 SdHoareTripleChecker+Invalid, 900 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 17:03:23,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 668 Invalid, 900 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 900 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 17:03:23,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-11-23 17:03:24,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 605. [2021-11-23 17:03:24,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 605 states, 604 states have (on average 1.1903973509933774) internal successors, (719), 604 states have internal predecessors, (719), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:24,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 719 transitions. [2021-11-23 17:03:24,184 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 719 transitions. Word has length 60 [2021-11-23 17:03:24,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 17:03:24,184 INFO L470 AbstractCegarLoop]: Abstraction has 605 states and 719 transitions. [2021-11-23 17:03:24,184 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 22 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 17:03:24,184 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 719 transitions. [2021-11-23 17:03:24,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 17:03:24,185 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 17:03:24,185 INFO L514 BasicCegarLoop]: trace histogram [28, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 17:03:24,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (141)] Forceful destruction successful, exit code 0 [2021-11-23 17:03:24,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (142)] Ended with exit code 0 [2021-11-23 17:03:24,607 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Ended with exit code 0 [2021-11-23 17:03:24,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3,142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:24,786 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 17:03:24,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 17:03:24,786 INFO L85 PathProgramCache]: Analyzing trace with hash 765952399, now seen corresponding path program 46 times [2021-11-23 17:03:24,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 17:03:24,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [403230201] [2021-11-23 17:03:24,787 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:03:24,787 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 17:03:24,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat [2021-11-23 17:03:24,787 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 17:03:24,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/mathsat -unsat_core_generation=3 (144)] Waiting until timeout for monitored process [2021-11-23 17:03:24,895 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:03:24,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:24,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:03:24,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:25,679 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:03:25,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:27,573 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:03:27,574 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 17:03:27,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [403230201] [2021-11-23 17:03:27,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [403230201] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:27,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [946902765] [2021-11-23 17:03:27,574 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:03:27,574 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 17:03:27,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 [2021-11-23 17:03:27,576 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 17:03:27,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/cvc4 --incremental --print-success --lang smt (145)] Waiting until timeout for monitored process [2021-11-23 17:03:27,801 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:03:27,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:27,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:03:27,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:27,944 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:03:27,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:28,079 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:03:28,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [946902765] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:28,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414060173] [2021-11-23 17:03:28,080 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 17:03:28,080 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 17:03:28,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 [2021-11-23 17:03:28,081 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 17:03:28,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b8f92265-2ef4-42c5-9528-0c69edfa1fae/bin/utaipan-fb15Y9Yzbl/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Waiting until timeout for monitored process [2021-11-23 17:03:28,164 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 17:03:28,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 17:03:28,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 17:03:28,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 17:03:28,291 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:03:28,292 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 17:03:28,394 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 0 proven. 472 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-23 17:03:28,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414060173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 17:03:28,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 17:03:28,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43, 43] total 84 [2021-11-23 17:03:28,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752367428] [2021-11-23 17:03:28,395 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 17:03:28,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-23 17:03:28,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 17:03:28,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-23 17:03:28,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1138, Invalid=5834, Unknown=0, NotChecked=0, Total=6972 [2021-11-23 17:03:28,396 INFO L87 Difference]: Start difference. First operand 605 states and 719 transitions. Second operand has 84 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)